Optical Tooling Instrument Calibration and Adjustment Using the

OPTICAL TOOLING INSTRUMENT
CALIBRATION AND ADJUSTMENT
USING THE
MODEL 270-BN UNIVERSAL
SHORT- RAN GE CALIBRATOR
Copyright 1987
by
Brunson Instrument Company
Reproduction of the information contained herein is prohibited
without
the express written
permission
of
Brunson
Instrument
Company.
fOREWORD
This manual was
developed as a
result
of requests
from
students a'ttending the Brunson Instrument C�mpany , s courses in
practices and procedures for instrument adjustment.
The lack of
written information prompted this writing.
contained herein a re specific, detailed procedures for 'Use
with the Brunson model 270-BN Universal Short-Range Calibrator.
These procedures,
while applicable in principle to a transit,
level,
or line scope,
are meant specifically for instruments
produced by the Brunson Instrument Company.
For information on
other makes, the manufacturer should be consulted.
No amount of printed material can be substituted for sound
instruction,
and
actual
experience
under
the
guidance
of
a
qualified in s tru ctor .
This manual is not intended as a itshort
course" in instrument calibration, but as a help for those who have
been properly trained.
Before attempting any work to the degree of
accuracy re quired of optical tooling, PROPER INSTRUCTION IS AN
ABSOLUTE NECESSITY.
TAB.LB .. OF CONTlm'l'S
TITLE
PAGE
FOREWORD
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TABLE OF CON'I�EN'llS
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NOTES ON HANDLING AND OPERATION OF OPTIC.AL INSTRUMENTS
INITIAL SET-UP
NO.
(TRANSITS AND LEVELS)
LIST OF ATTRIBUTES TO BE INSPECTED
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OPTICAL MICROMETER CALIBRATION
Backlash Measurement
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Zero-Center Adjustment...................................
Ra.nge Accuracy
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OPTICAL TOOLING TRANSIT CALIBRATION
Bullis-eye or
Circular
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Level Vial.
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ii
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Vertical Axis Bearing Runout............................. 22
Horizontal Axis Bearing Runout
Reticle Orientation.
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Horizontal Collimation
Vertical Centering
Vertical Line-of-sight straightness
Horizontal Line-of-sight Straightness
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Horizontal
Plumb Line
centering
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Front-to-Back Centering
Mirror Collimation
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Collimation--Fixed-Focus Cross Scope
Collimation--Adjustable
Focus Cross Scope
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Line-of-sight Straightness and centering
Adjustable Focus Cross Scope
PRECISE LEVEL CALIBRATION.........
Circular Level Vial
Reticle Orientation
Vertical Axis
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Bearing Runout
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Horizontal Line-of-sight Straightness
vertical Line-of-sight Straightness
COINCIDENCE LEVEL VIALS..
Coincidence
Stride
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Level Adjustment Using the Model 187-S
Level as a Reference
Coincidence
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Level Adjustment Using the Model 287-1
Leveling Mirror
as a Reference
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TITLE
ALIGNMENT TELESCOPE CALI BP.A'rION
I n it ial set-up for Line S copes and A l ignment
Telescopes on the Model 270-BN
Collimation at Infinity Focus
Line-af-s ight Stra ightness
Auto-Refl ection Target
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APPENDIXES
Trans it Hori z ontal Axi s Adjustment
Transit Standard Adjustment
Glossary of Terms and Abbreviations
List of Too l s Required for I nstrument Adj ustment
I l lustrations
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56
57
58
60
61
A-1
;\-2
A-3
A- 4
A- 9
A-10
KQ1'ES ON HANDLING ANQ OPERATION OF (' p'l�E�al INSTRUMEN'I'S
..
Followi ng are some <,.Jenera]. guidel ines for handli.ng and use of
optical tooling and survey ing instruments .
These rul es are by no
means & substitute for instruction by qual ified and experienced
personnel, but a re , in general, things to remember when using or
c a l ibrat ing the instruments .
1.
Get comfortable.
When making measurements or observat ions
with any prec is ion instrument 6 the operator must be in a
com fortable phys ical pos ition in order to ma i nta in accuracy_
Vari ou s stools, steps, etc . may be requ i red in order to
position the operator's body properly near the instrument .
2.
Handl e instruments a s the del icate , prec ise measuring tools
they a re .
The most ruggedly constructed trans it or l evel
cannot be expected to perform accurately when handl ed a s a
common hand tool. Even setting the instrument down roughly on
a hard surface can cause cal ibrat i on change s and damage .
3.
Always make sure the eyep iece of any instrument i s properly
Aim the te lescope at a
focused for the eye of the operator .
d i f fused l ight source , or hold a p iece o f wh ite paper in the
front of the objective lens .
Adj ust the eyepiece unt i l the
Th is
sharpest , b l ackest image of the ret icle is obta ined .
should automat ica lly become the f i rst thing an operator does
when mak ing a s ight ing .
4.
I f there are to be two or more operators us ing or testing one
instrument , one operator should be a l l owed to make a compl ete
read ing or series of readings be fore the second operator eve r
l ooks into the instrument.
Each obse rver must make h i s own
setup and take measurements uninterrupted in order to ma inta in
accuracy .
5.
Use extreme care when us ing the AA Gauge nUl tradex " fixture
found on the Test I nstrument mounting post of the model 270-BN
test stand .
The unit ' s accuracy of 1/ 4 arc second cannot be
ma inta ined without treat ing it as i f you were "walking on
When operat ing the Ultradex8s
eggs" every t ime it is used.
re l ease l ever , do not s imply pul l it , but first anchor your
hand on the base of the Ultradex to balance the force requ i red
to move the l ever . When indexing an instrument mounted atop
the UI tradex Q turn the table around sl owly. Th i s prevents the
inert i a of the instrument itsel f from d i sturbing the az imuth
setting .
1
6.
When using tangent screws t.o accurately point an instrument,
make a s etting, and then tap on the head of the tangent screw
with a f inger .
This wil l aid the tangent clamp mechan ism in
(In e f fect, thi s is a
"settl ing in" to a stab l e pos iti on.
kind o f stres s-rel i ef.)
Observation should then be made to
ver i fy the accuracy o f the setting, and more correction made
with the tangent screw a s necessary .
7.
Become f amiliar w ith the characte r i stics o f the instrument
before attempting to use or cal ibrate it .
S ome trans it type
instruments' telescopes will only al low one end of the
S im i l arly, most
tel escope to plunge through the standards .
optical micrometers w i l l not pas s through the standards of a
transit,
particularly when they are not in an upright
pos ition .
A
l ittl e care
in determining the phys ical
limitati ons o f the instrument t s mot ion may save expens ive
damage in use .
8.
When mounting o r d ismounting an instrument from a post or
Grip a structural ly strong part of the
stand, use two hands .
instrument with one hand, and manipulate the instrument base
with the other .
9.
When remov ing a n instrument from its case, make sure a l l parts
and proj ections are free of the case as the instrument is
l i fted.
Check to make certain any accessories, such as
optical micrometers, are secured so a s not to fal lo f f during
handl ing .
10.
When replacing an instrument in its case, make sure a l l parts
of the instrument are pos itioned properly to f it the contours
of the case when cl osed.
The tangent c l amps should be snug,
not tight, when the instrument i s in its case .
Many
instruments w i l l only fit the i r cases one way, and external
index marks are provided on some for proper pos ition ing.
Clos ing a case on an improperly pos it ioned instrument can
result in damage.
2
INITIAL SET-UP
Most
instruluents to be calibrated on the model 2 7 0-BN collimat ion
test stand are mounted on the Test Instrument ' s mounting pest in
the same manner (i.e., a fema l e screw thread in the base of the
Test Instrument fit.ted to a mal e thread on the mount ing post).
This procedure describes, in genera l , how an instrument should be
set up in order to begin calibration on the model 2 7 0 -BN .
1.
Determine the kind and size o f instrument mounting thread on
the Test Instrument in quest ion. I f th is is not a 3- 1/2 inch ,
a-thread Amer ican standard siz e , the proper adapter must be
chosen and fixed in p lace atop the Test Instrument ' s mount ing
post .
2.
Fix the Test Instrument to the mounting post firmly , but not
with extreme force . In the case of a four-screw leve ling base
on the Test I nstrument , l evel ing screws may need to be
l oosened from press ing tightly aga inst the bottom p l ate , in
order that the mounting may be threaded comp l ete ly together .
Al ign one opposing pair o f level ing screws on a l ine para l l el
to the Mul t iple Target Col l imator (M . T . C . ) , and the other pair
on a l ine perpendicular to the M . T.C.
3.
In the case o f a tribrach l eve l ing base , do not t ighten
exces sive ly; the greater the force app l i ed to the Test
Instrument ' s mounting threads , the tighter the l evel ing screws
wi l l become , and damage may result .
Snug is su f f icient ,
espec i a l l y for tribrachs .
4.
Manipu late the Test I nstrument's level ing screws so
" rough-in" level vial ( s ) show a l eve l condit ion.
instruments there is a ci rcular or "bul l r s- eyeD! vial
purpose . others use a pa ir of tubular via l s mounted
ang l e s to each other.}
5.
S et the T . I . tel escope l evel using its l evel via l .
6.
Loosen the c l amp on the Test Instrument ' s mount ing post , and ,
using the handwheel , raise or lower the Test Instrument to a
height that a l l ows a finite target in the M . T . C . to be
s ighted .
( Turn on col limator l ights using the toggl e switch
on the test stand control panel . )
Tighten the clamp on the
Test Instrument ' s mounting post .
NOTE:
that the
( On some
for th is
at r ight
Be fore l oosening the c lamp on the Test I nstrumentQs
mount ing post , BE SURE the hand-wheel is rotated
c lockwise until snug .
Th i s e l iminates any play in
the mounting post gears and protects the Test
I nstrument I s bearings from shock during mounting
post adj ustment .
3
7.
Us ing the eyepiece of the Test Instrument only, achieve the
sharpest poss ible focus on the Test I nstrument ' s ret ic l e .
This is essent i a l to the accuracy o f a l l measurements made ,
and shoul d be constantly re-veri f ied throughout cal ibration o f
any instrument.
8.
Focus the Test Instrument at infin ity and s ight the infinity
target o f the Mo T . C.
Us ing the Test Instrument 8 s tangent
screws ,
achieve approximate register between the
Test
InstrumentVs reticle and the M . T. C . infinity target .
9.
Focus the Test Instrument on the 4 - ft . M . T.C . target.
( For
some surveying instruments , the 6 or 1 6 ft. M . T . C . target must
At this short-focus d istance , note whether or not
be used . )
the
Test
Instrument ' s
hori zonta l
ret i c l e
l ine
is
in
approximate regi ster with that in the M . T . C . I f not , achieve
approximate reg ister by ra is ing or l owering the Test
I nstrument accordingly .
( I f the movement required is beyond
the range of the prec i s ion l i ft in the Test Instrument I s
mounting post , the c l amp must be l oosened , and the ent ire post
moved up or down us ing the handwhee1 . )
10.
Focus the Test I nstrument at infinity , and achieve accurate
register between the Te st Instrument ' s ret i c l e and the M . T . C .
inf inity target , us ing the Test Instrument ' s tangent screws .
1 1.
Focus the Test Instrument at the near- focus target .
Ach ieve
register between the Test Instrument's ret ic l e and the near­
focus target , us ing the prec ision l i ft and l atera l s l ide in
the Test Instrument ' s mounting post . ( Do not d i sturb the Test
I nstrument ' s tangent screws . )
12 .
I f the Test Instrument is a l eve l , the in i ti a l set-up is now
complete. I f the Test Instrument is a trans it , the spind l e o f
the U1tradex fixture must be made nomina l ly para l l e l t o the
Test InstrumentOs vert ica l axis .
( Cont inue this procedure . )
130
Veri fy that the " rough- in" l evel ing v i a l ( s ) are properly
adj usted , see pg . 2 1, and are centered to indicate a l evel
condit ion .
14 .
15 .
0
I ndex the ent i re Test Instrument 180 us ing the U1 tradex
fixture .
( Do not rotate the Test Instrument on its own
vert ica l axis bearings . )
Observe any out-of-level condit ion indicated by the O'rough- intV
Correct hal f thi s error us ing the Test InstrumentUs
vials .
l evel ing screws , and the other hal f using the l evel ing screws
in the Ultradex f ixture mount ing base .
( Two knobs found at
l e ft front and l e ft rear of Ultradex mounting base . )
4
16.
Repeat steps 14, 15 g and 16 of this procedurt2 unt.il the Test
Instrument can be indexed 1800 on ths Ultradex fixture and no
error is observed in the firough�·inoi level vial (s) .
17.
Ini tial set-l.lp is no�,rI complete and calibration procedures may
be performed.
5
CALIBRATION ATTRIBUTES OP OPTICAL TOOLING INSTRUMENTS
6
OPTICAL MICROME'l'ERS
1.
2.
3.
�
ModeJ.
"-M",
160 I
nos.
or
�-50"
190 , include models with
suff ix .
Backl ash:
Repeatab ility on a target approaching from
either direction.
Tol :
± 1/ 2 minor graduat i on.
" Zero" Center Adj ustment:
optical f l at of m icrometer is
perpend icular to the instruluent I s line-of-sight when the
sca l e reads " zero".
To l :
± 1/ 2 minor graduation.
Range Accuracy:
Micrometer sca l e accurate l y determ ines
the disp l acement of the l ine-of-s i ght.
Tol:
± 1/ 2 m i nor graduat ion .
7
TRANSI;rs
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
-
Model nos. 7 1,
with j"-11O
p
771 ,
"HI!,
75,
"ruIn,
761 7 9 , 3'.' 6, 379,
or uRaNu suffix.
include models
BullIs-eye or Circular Level Vial:
"Reading" surface of
the v i al is perpend icular to the vert ical axis.
Tol�
Bubble stays withi n black c ircular l i ne.
vertical Ax is Bear i ng Runout:
Instrument rotates
accurately about the vertical axis to describe a
hori zontal plane.
2.0 arcseconds .
Tol:
Hor i zontal
Ax i s
Bear ing
Runout:
accurately about
the
hori zontal
vertical plane.
1 . 0 arcsecond.
Tol :
Telescope
rotates
axi s
to
describe
a
Reticle
or ientat ion:
vertical
reticle
perpendicular to the hori zontal ax is .
Tol�
± 2.0 arcseconds.
line
is
Hori zontal Coll imat ion:
Instrument ' s l ine-o f-s ight is
perpendicular to the horizontal ax i s when focused at
inf ini ty.
Tol:
± 1.0 arcsecond.
vertical centering:
Line-of-sight and
intersect.
Tol:
± . 001 inch.
horizontal
axis
Hori zontal Line-ot-sight Straightness:
L ine-of-s ight as
measured from the verti cal ret icle l i ne is stra ight
throughout the focusing range .
Tol:
± .001 inch , or ± 1 arcsecond, wh ichever is
greater.
vertical Line-at-s ight S traightne ss:
Line-of-s ight as
measured from the hori zontal reticle l i ne i s straight
throughout the focusing range .
Tol:
± .001 inch, or ± 1 arcsecond , whichever is
greater.
Hor i zontal centeri ng:
Line-of-s ight
inte rsect.
Tol:
± .001 inch.
and vertical
Plumb Line:
The hori zontal and vertical ax is are
perpendicular to each other .
± 1.0 arcsecond
Tol:
8
axis
11,
Front-to- Back Centering ( Instruments with hollow vertical
axis only ) : Line'�of.-si9ht is concentri(.� to the vertical
axis �
Tol:
± . 0 0 1 inch.
12 .
Mirror Col l imat ion: The reflective surface o f the m i rror
is perpend icul ar to the hori zontal axis.
± 1.0 arcsecond
Tol :
13.
Col l imation--Fixed Focus Cross Scope:
is para l lel to the hor i zontal axis.
Tol :
± 1. 0 arcsecond
14 .
Collimation--Adj ustabl e Focus Cross Scope:
sight is para l l e l to the horizonta l axi s .
Tol:
± 1 .0 arcsecond
15 .
Line-of-s ight Stra ightnes s and Centering--Adjustable
Focus Cros s Scope:
The l ine of sight i s stra ight , both
vertica l ly and hori z onta l l y , and concentr i c to the
hor i z ontal ax is at a l l focal di stances .
Tol: ± . 002 inch , or ± 2 . 0 arcseconds , whi chever i s
greater for l ine-of-s ight straightnes s;
± . 002 inch for centering .
16 .
Coinc idence Level Via l : The axis o f the co inc idence v i a l
is para l l e l to the l ine-of-s ight.
Tol:
± 1 . 0 arcsecond
9
The l ine-af-s ight
The line - o f­
PRECISE LEVELS - Model
1.
2.
3.
Nos.
545,
545-1.
Bull's-eye or Circular Level Vial:
98Readinggi surface of
vial perpendicular to vertical spindle.
Bubble stays within black circular line.
Tol:
orientation:
Horizontal
Reticle
perpendicular to vertical spindle.
Tol:
± 2.0 arcseconds
reticle
line
vertical Spindle Runout:
Instrument rotates accurately
about its vertical axis to describe a horizontal plane.
5. 0 arcseconds
Tol:
4.
Horizontal Line-of-sight straightness:
Line-of-sight as
measured from the vertical reticle line is straight
-throughout the focusing range.
Tol:
± .001 inch, or 1 arcsecond, whichever is
greater.
5.
Vertical Line-of-sight Straightness:
Line-of-sight as
measured from the horizontal reticle line is straight
throughout the focusing range.
Tol:
±
00 1 inch, or 1 arcsecond, whichever is
.
greater.
6.
Coincidence Level Vial:
The axis of the coincidence vial
is parallel to the line-of-sight.
± 1.0 arcsecond
Tol:
10
ALIGNMENT S COPES - LINE SCOPES -
Model Nos. 8 1, 83, 38 1, include
model s
with
"- 1"
or
"-M"
suf f ix .
1.
Col l imation :
Line-of-s ight i s para l l e l to barrel 0.0.
when focused at infinity .
Tol :
± 1. 0 arcsecond
2.
Line-of-s ight straightness and Centering : Line-of-s ight
is stra ight , hor i z ontal l y and vert ica l ly , and concentric
at a l l focal d istances .
Tol : ± . 001 inch , or ± 1 . 0 arcsecond , whichever is
greate r .
3.
Auto Re f l ect ion Target :
0.0.
Tol :
±
Target is concentric to barrel
. 001 inch.
4.
Micrometer Backlash:
Repeatab i l ity on
approach ing from either d i rection .
Tol:
± 1/ 2 minor graduation .
5.
Opt ical
f l at of
Micrometer "Zero" Center Adj .:
micrometer is perpend icular to l ine o f s ight when sca le
reads "z ero" .
Tol :
± 1/ 2 minor graduat ion.
6.
Range Accuracy :
Micrometer scale accurate ly determ ines
the displacement of the l ine-of-s ight.
Tol :
± 1/ 2 minor graduation.
11
a
target
OPTICAL MICROMETERS
Brunson mode l nos. 1 60, 190, include model s with "-M" , or "-50"
suf f ix.
Princ iples a l so appl icable to micrometers found in model 83
a l ignment telescope.
12
QPTICAL MICROMET�R NOTES
A
graduated scal e used to verify the accuracy o f optical
m icrometers i s mounted directly above the M.T.C. in the model 270BN calibration test stand.
Other targets may also be used; such
as;
targets phy s i ca l ly manipulated by a mechanical micrometer I
cal ibrated glass reti c le s, or white-face tooling sca les .
Th is procedure deals with optical micrometers whi ch are detachable
from the Test Instru.ment ' s telescope
'l'hos e which are contai ned as
a unit with in the tel escope , such as the model 83 a l ignment
tel escope , a re dea lt with in the s ecti on on l ine scopes .
0
OPTICAL MICROMETER ADJUSTMENT
-
MODEL 160
The model 1 6 0 micrometer has two axes of operation for coordinate
measurement . E a ch of the two m icrometer el ements in the model 160
is adjusted i n exact ly the same manner as the model 190.
The
entire
t e st must be performed for each e l ement separately
13
.
QPTIC�L MICROMETER �DJUSTMENT - MeDEL 190
'fHE
No'rE:
TEST
INSTRUMENT i S
MICROMETER
ACCURACY IN
RETICLE
CALIBRATION
TARGET
LINES
MUST
AND
BE
THOSE
OF
PARALLEL
THE
FOR
THIS TEST.
BACKLASH MEASUREMENT
Descr iption:
Repeatab i l ity on a target approaching from
either d irect ion.
Tolerance:
± 1/2 minor graduation
Affected Parameters :
Al l
1.
with the model 190 micrometer secured on the Test Instrument ' s
telescope in
the upright
position ,
sight the
micrometer
calibration target , and focus accurately on that target.
2.
Set the graduated dial on the mi crometer precisely at zero.
Us ing the Test Instrument's horizontal tangent screw , achieve
accurate register between the Test
I nstrument's vertical
reticle line and that of the micrometer calibration target.
(The horizontal retic le line should also be approximately in
reg ister . )
3.
Turn the micrometer graduated dial clockwise at lea st 10 minor
div isi ons.
Sight into the Test Instrument and , turning the
micrometer dial counterclockwise, bring the vertical reti cle
line
back
into
reg ister with
the mi crometer
calibr ation
target.
Do not turn past this point , or "rockll the micrometer
d i a l back and forth.
Observe any error from the zero point.
4.
Turn the m i crometer graduated dial counterclockw ise at least
10 m inor div isions.
Sight into the Test Ins trument and ,
turning the micrometer dial c lockwise ,
bring the vertica l
ret i c l e
line
back
into
register
with
the
micrometer
cal ibra tion ta rget .
Do not turn past th i s point , or " rock"
the micrometer dial back and forth .
Observe any error from
the zero point.
5.
If an error greater than 1/2 a m inor graduation is measured in
steps 3 or 4, the m i crometer has backlash error.
Return it to
the factory for repair.
14
Z ERO-CENTER MEASUREMENT AND ADJUS'l'MENT
Description:
opt ical flat of micrometer is
perpend icular to the instrument � s 1 ine-of­
sight when the scale reads oOzeron•
Tolerance :
±
Affected Paramete r:
None
1/2 minor graduation
1.
Uncl�mp the model 190 micrometer and sl ide it forward o n the
end of the Test Instrument ' s telescope barreli j ust unt il the
notch i n the micrometer body i s clear o f the locat ing pin
attached to the telescope barrel.
Lightly cl amp the
micrometer clamp screw , but only unt i l the m icrometer may be
rotated about the end of the tel escope barrel w ith the feel of
Leave the micrometer upright on the Test
a o 'bush ing f it . II
I nstrument ' s tel escope barre l .
2.
Make certa in the micrometer graduated d i a l is set prec isely at
zero .
Us ing the Test Instrument ' s hor i z onta l tangent screw ,
ach ieve accurate reg ister between the Test Instrument ' s
vertical reticle l ine and the micrometer cal ibration target .
3
Gently rotate the micrometer 180° on the end o f the Test
I nstrument ' s tel escope barre l .
Extreme care must be used in
this movement so that the Test I nstrument is not moved , in
order not to d isturb the zero reference setting o f step 2.
•
4.
Measure any error in regi ster between the Test Instrument's
vertical reticle l ine and the micrometer ca l ibration target ,
by turn ing the micrometer graduated d i a l unti l a ccurate
register is achieved.
Ha l f th is measurement is the actual
error and should be no more than hal f o f one minor di v i sion .
I f in excess of this amount , the zero-center may be adj usted
as fol lows :
Ao
Remove
the
model
190
m ic romete r
f rom
the
Test
Instrument ' s tel escope barre l , and place front-end down
( zero i ndex facing upward) on a flat sur face.
Be sure
the surface is c l ea r o f any particle s that might scratch
or break the front cover glasso
B.
Set the graduated di a l to the exact amount o f zero-center
correct ion required , and in the proper d i rect ion from
zero . Whi le holding the knurl ed knob above the graduated
dial exactly in this pos itiong l oosen the three screws
nea r the c ircumference o f the top o f the knurl ed knob .
po not disturb the screw at the exact center of the
knurled knob.
Extreme care mus� be exerci sed in o rder
not to turn the knurl ed knob as the three screws are
l oosened (see p icture on next page ) .
15
800r) Cac::t 231'd Str�f;t • Kan::,a') City. MtJ. R4129
f'HONE AC(816) 41-13-3187
Loo s ening
s crews
f0r micrometer
zero-center
Movin g t he gradua t ed d ial.
a djus tmen t .
c.
5.
still tak ing care not to turn the knurl ed knob from the
setting made at the begi nning
of
step S,
s l ip the
graduated dial around to again read zero.
Tighten the
three screws in the knurled knob, taking care not to turn
e i ther the knob or the graduated dialo
Repeat steps 2,
amount of error,
3 , and 4 until no error ,
is measured at step 4.
17
or
an
acceptable
Descript:i.ou:
MicrOIlleter scale accurat.ely determines the
displ acement of the line-of -s ight
Tolera.nce:
±
A f fected Parameters:
Zero-centering
1/2 minor graduation
1.
Clamp the model 190 micrometer upright on the end of the Test
Instrument I s tel escope barre l , and set the graduated d i a l
prec isely at z ero .
Using the Test Instrument V s hor i z ontal
tangent screw , ach ieve accurate register between the Test
Instrument's vert ical ret icle line and that o f the micrometer
cal ibration target .
2.
Whil e s ight ing into the Test Instrument , turn the micrometer
ca l ibrated d i a l cl ockwise unti l accurate register is ach ieved
between the Test Instrument's vert ical reticle l ine and the
graduation on the cal ibration target corresponding to a ful l­
sca l e reading o f the model 190 micrometer .
3.
Repeat steps 1 and 2 , but th is time turn the graduated d i a l i n
a countercl ockwise d i rection.
4.
If an unacceptable inaccuracy is found at e i ther end o f the
mi crometer cal ibrated d ia l , the micrometer may be adj usted as
fol l ows:
15 .
A.
If both ends o f the calibrated dial read short or l ong by
the same amount , use the sma l l a l l en-head set screws in
the top of the micrometer body to push the "head" o f the
micrometer (graduated dial , index plate, knurled knob,
etc. ) from front to back or from back to front as
necessary (see p icture on next page ) .
B.
If both ends of the cal ibrated d i a l read short or long by
d i f ferent amounts, or i f one reads short and the other
reads l ong , use the a l len-head set screws in the top of
the micrometer body to push the "headu of the micrometer
from s ide to side (see picture on next page ) .
After any adj ustment is made for micrometer sca le accuracy ,
check the z ero-centering
0
18
Micrometer range accuracy
adjustment.
(One side reading
shorter or longer than the other.)
; �
"
Micrometer range accuracy adjustment.
short or long by the same amount.)
.,
(Both sides reading
OPTICAL TOOLING TRANSITS
Brunson model nos. 7 1 , 7 7 1 , 75 , 76 , 7 9 , 37 6 , 37 9,
with "- 1 " , "H", UlRHVI, or "RHNIi suf f ix .
20
include models
Descript ion:
vial
"Reading"
surface
of
perpendicular to the vert ica l axis.
Tol e rance:
Bubbl e stays with in black lines
A ffected Parameters :
None
Is
1.
Use the 'rest I nstrument w s l evel ing screws to adj ust until
bubbl e is centered .
2.
Rotate the Test Instrument about its vert ical axis 1800
observe bubble.
3.
Correct one-hal f the bubbl e centering error with the v ial
mounti ng screws, and the other ha l f �Ti th the Test I nstrument I s
l eveling screws.
4.
Repeat steps 2 and 3 unt i l no error is observed in the v i a l
when the Test Instrument is rotated about its vert i cal axis.
21
-­
Description:
Instrument rotates accurately about its
vex"tical axis t.o describe a horizontal
plane.
Tolerance:
2 . 0 arcseconds
Affected Parameters:
All
Note:
1.
2.
In this procedure either an M. T. C. or a line scope can be
used as the reference scope: this scope will be referred
If a line scope is used it must be
to as the collimator.
set to infinity focus.
Rotate the Test Instrument about its vertical axis roughly 5
times in the same direction.
This ensures the individual
balls in the vertical axis bearings have all made at least one
complete revolution.
Point the Test Instrument's telescope at the collimator and
focus
the
instrument
to
the
infinity
reticle
of
the
collimator.
using
the
vertical
tangent
screw,
achieve
accurate register between the Test Instrument I s horizontal
reticle line and the collimator's
position the vertical
reticle line of the Test Instrument in close proximity with
that of the collimator's vertical reticle line while
keeping the horizontal tangent clamp loose.
0
3.
4.
Gently rotate the Test Instrument about its vertical axis 4 to
5 times re-pointing back to the collimator each time and
observe any error.
Be sure to reposition the vertical
reticle line near its original position.
If an error greater than the tolerance is observed, rerun the
test to ensure that the observed error is actually bearing
runout and not movement of the entire instrument.
If it is
determined that the error is bearing runout,
repairs are
required and the Test Instrument should be returned to the
manufacturer for repair.
22
HOR(ZONTAL AXIS BEARf.NG RUNOU�
Description�
Telescope rotates accurately
horizonta l axis to describe
plane .
Tol erance:
1 . 0 arcsecond
A f fected Parameters:
Al l
Note:
a
about the
vertical
I n this procedure e ither an M . T.C . or a l ine scope can be
used as the reference scope; thi s scope w i l l be re ferred
to as the col l imator . I f a line scope i s used it must be
set to infinity focus .
1.
Rotate the Test Instrument about its horizontal axis roughly
5 t imes in the same d irect ion .
Th i s ensures the ind iv idua l
bal l s in the hori z onta l axis bearings have a l l made at l east
one compl ete revolut ion .
2.
Point the Test Instrument ' s tel escope at the co l l imator and
focus
the
instrument to the
infin ity ret icle
of
the
col l imator .
Us ing the horiz ontal tangent screw , achieve
accurate regi ster between the Test Instrument I s vert ical
reti c l e l ine and the col l imator's .
Posit ion the hor i z onta l
ret i c l e l ine of the Test Instrument in close prox imity with
that o f the coll imator's horiz ontal reticle l i ne keeping the
vert ical tangent clamp loose .
3.
Gently rotate the Test Instrument about its hori zontal axis 4
to 5 t imes re-point ing back to the col l imator each t ime and
observ ing any error .
Be sure to repo s ition the hor i z onta l
ret i c l e l ine near its orig inal l ocation .
4.
I f an error greater than the tol erance i s observed , rerun the
test to ensure that the observed error is actua l l y bearing
runout and not movement o f the ent ire instrument .
I f it i s
determined the error i s bearing runout , repa irs are required
and the Test Instrument should be returned to the manufacturer
for repa ir.
23
RETICLE
ORIENTATION
Descript ion :
vertical reticle line is perpendicu l a r to
the hor i z ontal axis .
Tolerance :
± 2 . 0 arcseconds
Affected Parameters :
Hori z onta l
C o l l imat i o n ,
ve rt i c a l
Centering , Coinc idence Level Vi al
Note :
In thi s procedure e ither an M. T . C. or a l ine scope can be
used a s the re ference scope ; th i s scope w i l l be re ferred
to as the col l imator . I f a l ine scope i s used it must be
set to infinity focus .
1.
Level the Test Instrument using the Bul l i s-eye Level.
2.
S ight the col l imator and focus on the inf inity reti cle . Bring
the Test Instrument's reticle into prec i se register with the
infinity ret icle of the col l imator us ing the Test Instrument ' s
tangent screws .
3.
Observing a point o n the col l imator's reticle , use e ither the
Test Instrument ' s vertica l or hor i z ontal tangent screw and
Noti ce whether the ret i c l e l ine
"trackil across that point .
you are using stays in register with or dev iates from the
po int .
4
I f deviation is observed , note wh ich direct ion the Test
InstrumentVs ret icle i s tilted .
I f error i s more than the
tole rance , use a dri ft and sma l l hammer to tap aga inst the
adj usting screw heads o f the Test Instrument I s ret i c l e to
rotate the reticle into pos ition . These are the four capstan­
head screws farthest from the eyep iece and pos it ioned at 12,
When adj ust ing , tap aga inst oppos ing
3, 6 , and 9 o·c l ock .
screw heads , 12 and 6 or 3 and 9 , for even adj ustment to the
reticle.
( See picture on following page ) .
.
5.
Repeat steps 1 , 2, and 3 unt i l the Test InstrumentOs reticl e
l ine stays in tol erance with the point .
24
SRUNSOiN INSTRUMENT COMPANY
�OU(J L8!')t 2Jrd Street
..
�\n'l
'. '
.'-it}'
PHONE /\C(816) 4i;n 3187
�JI'\
';4129
Adjusting reticle orientation.
Location of telescope adjusting screws.
lens screw.
1)
Reticle screw.
2)
Erector
HORIZONTAL COLLIMATION
Descript i on :
l ine-o f - s ight
I n s t r u m e n t 's
is
perpend icul ar to its hor i z onta l axis when
focused at infinity.
Tolerance:
±
Af fected Parameters :
ret icle orientation
1.0
arcsecond
1.
For best results , l eave the vert ical tangent cl amp l oose and
the micrometer drum po inting up or down .
2.
Rough l evel the Test I nstrument .
S et the barrel so the
coinc idence vial is reading l evel across the Ultradex
Rotate the U ltradex 1 8 00 and observe the
adj ust ing screws .
v i a l reading .
Remove one-hal f the e rror with the vertical
tangent screw and the other ha l f with the Ul tradex adjusting
Repeat the 1 8 00 rotation removi ng one-hal f with the
screws .
instrument and the other hal f with the Ultradex unti l the
instrument vial stays re l at ive ly l eve l .
Rotate the Ul tradex
900 and bring the Test I nstrument's v ial into l evel us i ng the
Ultradex adj ust ing screws . Th i s w i l l be suf f ic ient to per form
hor i z ontal col l imat ion .
3.
Prec i sely reg ister the Test Instrument ' s vert ical ret i c l e l ine
with that of the M . T . C. 's infinity target , the hor i z onta l
reti c l e l ine should be nomina l ly regi stered .
4.
Gently re l ease the Ultradex i ndexing f ixture and rotate 180°.
W ith the Ultradex tabl e secured , plunge the Test Instrument's
telescope 1800 so as to be s ight ing back at the M . T . C.
5.
Observe any error i n register between the vertical ret ic l e
l ines of the Test I nstrument and that o f the M . T.C .
6.
I f the observed error is greater than 2 a rcseconds ( actua l
error greater than 1 arcsecond ) , correct one-ha l f the observed
error using the Test Instrument ' s reticle adj usting screws
( the four capstan-head screws farthest from the eyepiece )
Adj ust the two capstan screws l ocated at 3 and 9 o O cl ock .
0
7.
Repeat steps 2 through 5 unt i l the observed error i s not more
than 2 a rcseconds as in step 4 .
8.
I f adj ustments were made , the a ffected parameters must be
checked and adj usted as required .
26
YEH.'l'ICAL CENT�BJJ.Ki
Description�
vertical line-of-s ight
axis intersect
and
horizonta l
c o l l imation,
ret i c l e
. .
. 0 0 1 inch
Tolerance :
±
Af fected Parameters :
Hor i z onta l
orientation
Note:
In th is procedure e ither an M . T. C . or a l ine scope can be
used as the re ference scope� this scope w i l l be re ferred
to a s the coll imator . I f a l ine scope i s used, the focus
must be set to infinity .
1.
The micrometer should be rotated 900 so the micrometer drum i s
point ing to the s ide and set t o zero .
B e careful, a s some
instruments , such as Brunson's, wi l l not plunge through with
the micrometer in th is position.
2.
Focus the Test I nstrument at the col l imator ' s in f in ity
Precisely regi ster the Test I nstrUment I s ret icle
ret ic l e .
with that o f the col l imator us ing the horizontal and vert ical
tangent screws .
3.
Focus the Test Instrument at the co l l imator ' s closest target .
Precisely regi ster the Test Instrument ' s ret i c l e with that of
the col l imator ' s target us ing the prec is ion l i ft and s l ide .
4.
Repeat steps 1 and 2 unt i l the Test Instrument can be focus ed
from inf inity to the near target o f the c o l l imator without
making any adjustments to the test instrument .
S.
Rotate the Test Instrument 1800 about its vert ical axis and
p lunge the scope 180' sighting back to the col l imator . Focus
the Test I nstrument to in fin ity and preci s e ly reg ister the
Test I nstrument ' s reticle with that of the col l imator us ing
only the tangent screws .
Focus back to the near ret i c l e and
measure the amount needed to bring the Test Instrument ' s
horizontal ret icle into regi ster with the col l imator ' s
hor i z ontal reticle .
6.
I f the observed error is greater than 0 . 00210 ( actual error
g reater than 0 . 00198 ) I correct three to four t imes the obs e rved
error using the two ret icle adj usting screws found at 12 and
6 o'c l ock .
7.
Repeat steps 1 through S unt i l the observed error i s no more
than O.002u•
8.
I f adjustments were made , the a ff ected parameters must be
checked and adj usted as required .
27
HORI ZONTAl.. I,I NE -OF-SIGl1'f STRAIgHTNES S
Desc r ipt ion:
Line-o f-s ight is stra ight throughou� the
focus ing
'range
as
mea. sured
from
t.he
vert ical ret i c l e l ine.
To l erance :
± . 00 1 inch,
is greater.
Affected Parameters :
Hor izontal collimat ion , vertical Line - of­
sight Stra ightness , vert i cal Centering
1.
2.
3.
or ±
1 :;\ rcsecond ,
wh i chever
Rotate the mi crometer on the Test
Instrument -to the up
pos i t i on with the mic rometer drum set on zero for this test .
The barre l should be pos i t i oned so that the focus knob is up.
Th is is known as the di rect pos i t ion .
If an opt ical wedge is
used to measure the error , posi t ion i t in place w i th the zero
mark on the vert ical index mark .
Focus the Test I nstrument to the M . T . C . ' s infin ity target .
Prec isely register the Test I nstrument ' s ret icle w i th that of
the M . T . C . using the hor izont al and vert i cal tangent screws .
Focus the Test Inst rument to the M . T . C . ' s closest target .
Precisely regi ster the Test I nst rument ' s reticle wi th that of
the M . T . C .
us ing the precision lift and sl ide .
4.
Repeat steps 2 and 3 unt i l the Test Instrument can be focused
at the far and near targets of the M . T . C . without making any
adj ustments to the Test Inst rument .
5.
Without disturbing the tangent screws,
lateral sl ide ,
or
prec is i on lift, take readings wi th e i ther the microme ter or
opt i cal wedge as to the d ispl acement of the vert i cal ret i c le
l ine from the intermediate targets of the M . T. C .
Record
readings and note what s ide of z ero the m i crometer or wedge
read ing res ides .
6.
7.
Rel ease the horizontal tangent clamp and rotate the Test
Release the vert i cal tangent cl amp and
Instrument 1 8 0 0 •
plunge the telescope 1 8 0 0 •
Th is is known as the ind irect
pos i t ion .
Repeat steps 2 through 5 .
Compare the two read i ngs taken at each focal length to each
other .
For micrometers , take one -half the algebra i c sum of
the two read i ngs .
For opt i cal wedges ,
take one-half the
algebrai c d ifference of the two read ings .
28
8.
I f the number a rr. ived at for stra ight:nesf-; of l i ue-·of-s ight i s
O . O O l W or less at the 1 6 - ft . o r less targets , or 1 arcsecond
or lass at longer focal l engths , results ar� acceptabl e .
If
results are in excess of these to lerances , adj ustments are
mad�! as fol lows :
A.
Remove the four regular screws found o n the barrel where
the telescope rotates around its horizontal axis .
B.
Move the focus knob so as to move the focus sl ide towards
the obj ect ive lens. Be fore the sl ide reaches its e nd o f
travel , a set screw w i l l l ine u p under each hol e .
c.
By l oosening the pa ir o f set screws on one s ide and
tighten ing the pa ir on the oppos ing side , the focus l ens
wi l l be moved from s ide to s ide ins ide the focus s l ide .
The lens is pushed in the d irection that the retic l e
looks l i ke i t needs to go . CAUTION, A SMALL TWEAK OF THE
LENS IS ALL THAT IS NE EDE D .
A tweak could move the l ine­
of -s i ght by as much as 3 arcseconds .
9.
I f the lens has to be moved , the a f fected parameters must be
checked and adj usted as requ ired .
10 .
Repeat the procedures for checking l ine-of-s ight aga in unt i l
step a i s sat i s f ied .
Not e :
the verti cal and Hor i z ontal Line-o f- s i ght s traightness
cal ibrati ons are pres ented s eparlltely for e a s e of ins truc t i on ,
but
it
is
advantaqaous
fo�
the
operator
to
do
both
s imul t aneous ly as one a f fects the other .
29
VER'fl CAL LINF.; M·OF- S I GHT STRAIGHTNESf2.
Descript ion :
Line-of-s ight i s stra ight throughout. the
focusing range when measured f rom 'ttle
hori zonta l ret i cle l i ne .
Tolerance :
±
Af fected Parameters :
Hori zontal Col l imat ion , Hori zont a l Line­
o f- s ight stra ightness , vert ical centering
1
.
0 0 1 inch or
is greater .
.
±
1
a rcsecond ,
whichever
Rotate the micrometer on the Test I nstrument to the s ide
pos it ion with the micrometer drum set on zero for th i s test .
The barre l should be pos it ioned so that the focus knob i s up .
This i s known a s the direct pos ition .
I f an opt ical wedge i s
used to measure the error , pos ition it in p l ace with the zero
mark on the hor i z onta l index mark .
2.
Focus the Test Instrument to the M . T . C . ' s i nfinity target .
Prec isely reg ister the Test I nstrument ' s ret icle with that o f
the M . T . C . us ing the hor izontal and vert ical tangent screws .
3.
Focus the Test I nstrument to the M . T . C . ' s c l osest target .
prec isely reg ister the Test Instrument ' s reti c le with that o f
the M . T . C . us ing the prec is ion l i ft and s l ide .
4 .
Repeat steps 2 and 3 unt i l the Test I nstrument can be focused
at the far and near targets o f the M . T . C . without making any
adjustments to the Test Instrument .
5.
without di sturbing the tangent screws , l ateral s l ide , or
prec is ion l i ft , take readings with e ither the micrometer or
opt ical wedge as to the displacement of the hor i zontal ret ic le
l ine from the intermed iate targets of the M . T . C .
Record
readings and note what s ide o f zero the micrometer or wedge
reading res ides .
6.
Release the hori zonta l tangent c l amp and rotate the Test
Instrument 1 8 0 0 •
Rel ease the vert ica l tangent c l amp and
Thi s i s known as the ind i rect
plunge the telescope 18 0 0 •
pos it ion .
Repeat steps 2 through 5 .
7.
Compare the two readings taken a t each focal length t o each
For mi crometers , take one-hal f the sum o f the two
other .
readings , be ing sure to observe the s ign . For optical wedges ,
take one-ha l f the d if ference of the two read ings , be ing sure
to observe the s ign .
30
a.
If
the number arr ived at for stra ightnes s t) f U. neuQ f · · s tght i s
0 . 0 0 1 " o r l es s a t the 1 6 - ft . or l e s s targets l o r 1 arcsecond
or l ess at longer foca l l engths, resu lts are �cceptab l e .
If
results are i n excess o f these tolerance$ p adj ustments are
made as fol l ows g
A.
Remove the four regular screws found on the barrel where
the tel escope rotates around its horizonta l axis .
B.
Move the focus knob so as to move the focus s l ide towards
the obj ective l ens . Be fore the s l ide reaches its end o f
trave l p a s e t screw wi l l l ine up under each hol e .
c.
By l oosening e i ther the top or bottom pa i r
and doi ng the oppos ite on the oppos i ng
o f set screws
pair o f set
screws , the focus l ens wi l l be moved up or down ins ide
the focus s l ide .
The l ens is pushed in the opposite
d i rect ion that the ret icle l ooks l ike it needs to go .
CAUTION , A SMALL TWBAK OF THE LENS I S ALL THAT IS NEEDED .
A tweak coul d move the l ine-of-s ight by as much as 3
arcseconds .
9.
I f the l ens has to be moved , the af fected parameters must be
checked and adj usted as required .
10 .
Repeat the procedures for checki ng l ine-of-s ight aga in unt i l
step 8 i s sat i s f i ed .
Not e :
the verti c�l and Bor i � ontal Line-ot- s i ght straightness
cal ibrations are pres ented s eparately for ease Q f i ns truc t i on ,
but
it
is
advantageous
for
the
operator
to
do
both
s imul t aneou s l y as one affeots the other .
31
HORI ZONTAL CENTERING
Descript i on :
Line-of-s ight
intersect .
Tolerance :
±
Af fected Parameters :
None
Note :
and
vert ical
axis
. 00 1 inch
In this procedure e ither an M . T . C . or an a l ignment scope
may be used as the reference scope ; thi s scope wi l l be
referred to as the col l imator .
It needs to be nomina l l y
l evel .
1.
Rotate the micrometer so that the micrometer drum i s fac ing up
Focus the Test
or down and the micrometer is set on zero .
Instrument to the inf inity ret icle in the col l imator and
achieve prec ise reg ister o f the Test Instrument ' s vertical
ret icle l ine and that of the col l imator us ing the tangent
screw ,
the horizontal
reticle
l ine must be nomina l ly
regi stered .
2.
Focus the Test Instrument to the near target and achieve
prec ise reg ister between reticle and target u s ing the
prec i s i on s l ide and or coord inate adjuste r .
3.
Repeat steps 1 and 2 unt i l the Test Instrument can be focused
at e ither infin ity or the near target and the ret icles stay in
regi ster .
4.
Rel ease the hor i z ontal tangent clamp and rotate the Test
Instrument 180 ° about its vertical axis . Rel ease the vert ical
tangent clamp and p l unge the telescope 1 8 0 ° .
Focus the Test
Instrument to the infinity ret icle of the coll imator and
ach i eve prec i se reg i ster of the Test Instrument ' s ret icl e and
that of the c ol l imator us ing the tangent screws .
5.
Focus the Test Instrument on the near target o f the
col l imator .
Obta in accurate regi ster between the vertical
reticl e l ine o f the Test Instrument and the col l imator I s
target by using the micrometer .
Ha l f the read ing i s the
amount by which the l ine-of-s ight is o f fset from the vert ica l
axis .
I f thi s number i s greater than 0 . 0 0 2 " I the Test
Instrument ' s standard must be shi fted s ideways .
Thi s i s
performed a s fol lows ( for more deta i l ed in format ion , refer to
the append ixe s ) :
32
A.
B.
6.
Loosen the 8 a l len-bead screws l ocated under the bottonl
E ither us ing a
o f the standard o f the Test I nstrument .
dial ind icator or by observing the amount of travel whi le
s ighting through the scope , turn the a l len-head screws
located on the s ide of the Test Instrument .
The screws
w i l l push the standard in the d i rection needed for
correcti on , be sure and l oosen the oppos ite screw ( refer
to the p ictures on the fol lowing pages ) .
Tighten the 8 a l l en-head screws on the bottom
Repeat steps 1 through 5 unt i l
greater than O . 0 0 2 � .
33
the
observed
error
i s not
,{COO F- a s l 2:Jr<1 �:; t f (�f d
'.
K,msas (>'y' . ,\;j f) 6 1 1 �9
P H O N E .f..C (8 1 6 ) 183· :-, i 8 1
Loos en in g s c r ew s ho l d ing
t h e p l a t e t o t h e s tandard ,
prepar a t i on
s tan d a r d .
in
for moving t h e
(Adj u s t men t
c en t e r ing t he
w i t h r e s pec t
for
l in e of s ight
t o t h e ve r t i c a l
axis . )
Moving the
of
a
t r an s i t ,
s t an d a rd
u s ing a
r�
d ia l in d i c a t or t o mea s ­
ure
t r a ve l .
I�
,�
�
�
\
Descr ipt i on :
vert ical axi s if.:
h or i � onta l axis .
Tolerance :
± 1 a rcsecond
A f fected Parameters :
vert i c a l centering g Hor i z onta l cente r i ng ,
Ret i c l e ori entat ion
1.
2.
3.
40
pe rpend i cu l a r
to
the
Focus the Test Instrument to i n f inity and s ight one o f the
col l imators that is at an angle . Using the hor i z ontal tangent
sc rew , prec i s e l y reg i s ter the vert i cal ret i c l e l ine o f the
Test Instrument with that o f the col l imator e
For greater
accuracy ,
l eave the vert ical tangent cl amp l oose and the
hor i z ontal ret i c l e l i ne should be in close reg ister with that
of the c o l l imator ' s hor i z onta l ret i c l e l i ne .
Tra n s i t the Test I nstrument O s tel escope to s ight the other
ang l ed col l imator . Us ing the col l imator pos i t i oning screws in
the test s tand , ach i eve accurate reg i ster between the Te st
I n st rument ' s vert i c a l
ret i c l e
l ine
and the co l l imator ' s
ret i c l e l i ne .
Do not d is turb the Test I n strument ' s tangent
screw .
Loos en
the
hor i zontal
c l amp
screw
and
rotate
the
Test
Instrument 1 8 0 0 about its vert i cal ax i s o
Use the hori zontal
tangent sc rew to ach ieve accurate reg i s ter between the Test
I n strument ' s vert i c a l ret i c l e l i ne and that o f the f i rst
Hor i z onta l ret i c l e l i nes should a l s o be i n
col l imato r .
approximate reg i ster o
Trans i t the Test Instrument ' s te l e scope to s i ght the other
Measure with a wedge or est imate the observed
col l imator .
error in reg ister between the Test Instrument I s vert ica l
ret i c l e l ine and that of the co l l imator .
I f th i s e rror
exceeds 2 arcseconds ( 1 arcsecond actua l ) , adj ustment is as
fol l ows ( re fer to p icture on next page ; for more deta i l on the
adj ustments , refer t o the append ixes ) :
A.
B.
E ither l oosen or t ighten the ax is -bear i ng cap s c rews
l ocated
on
the
s ide
wi th
the
capstan-head
sc rew
One-ha l f o f the error is a l l that needs t o
adj ustment .
be removed .
I f a l a rge adj ustment must be made o r the ax i s bearing
cap s crews should become too t i ght or l oose , the capstan­
head screw may have t o be adj usted .
Th i s screw i s
underneath the a x i s -bea ring and pushes the axis up o r
a l l ows i t to sett l e down .
35
5.
6.
Repeat steps 1 through. 4 I.A nt i l no more 'I".han >,>, arcseconds o f
observed error is present .
I f adj ustments were made � the a f fected parameters must be
and adj usted as required ,
checked
36
8000 East 23r r; S t reet . K a nslis C i l y , M o . 64 1 29
P H O N E A C ( 8 1 6 ) 483-3 1 87
Mov in g an a x i s - be a r ing ca p s crew t o a d j u s t
be tween
t h e h o r iz on t a l a n d ver t ic a l
t he r e l a t ion s h i p
axe s .
•
Mov ing
t h e a x i s a d j u s t men t
b e tween t h e h o r i zonta l
screw t o a d j u s t
a n d ver t ic a l ax e s .
t h e r e l a t i on s h i p
FRowr-TO·�B.e.CK
CEN'rERING -:--HOLLOy.J VERTI CAL_.SPINDLE ONLY
Descript ion :
Line - o f- s l ght
ver.t i c a l a x i s .
Tol erance :
±
A f fected Parameters :
Hor i z ontal Center ing ,
.
001
is
concentric
to
the
inch
Plumb Line
1.
Trans i t the Test I nstrument V s te l escope s o the obj ectiv e lens
2.
Rotate the Tes t Instrument about i t s vert ica l a x i s and observe
is in the down pos it ion between the instrument ' s standard .
Loosen the m icrometer c lamp and gently rotate the m ic rometer
90° .
Be sure the m icrometer is on z e ro .
the eyep i ec e wobb l e .
pos i t i on the t e l escope ba rrel s o a s to
e l im inate
any
observab l e
wobbl e
in
the
eyep ie c e
as
the
instrument is rotated about its vert i c a l a x i s .
3.
Focus the Test Ins trument at i n f inity and s i ght the i n f i n ity
ta rget l ocated in the opt i c a l p l ummet col l imator l ocated i n
the bottom o f t h e mounting post .
Rotate t h e Test I n s t rument
o
that
the
Test
I
nstrument
'
s
ret
i
c
l e and that of the p lummet
s
c o l l imator are in the s ame o r ientat ion .
Ach i ev e accurate
reg i ster between the Test Inst rument ' s hor i z onta l ret i c l e l in e
and t h e p l ummet co l l imator ' s hor i z onta l ret i c l e l i ne b y us ing
the Test I ns trument ' s vert i ca l tangent screw .
Pos i t i on the
ve rt ica l ret i c l e l ine on u s i ng the Tes t I nstrument V s l ev e l i ng
s c rews perpend i cu l a r to the M . T . C .
4.
Rotate
5.
If
an
error
in
reg ister
is
observed
between
the
Test
I nstrument ' s hor i z ont a l ret i c l e l ine and that of the p l ummet
the
Test
Instrument
180 0
about
i t s vert i c a l
axis
a nd
return to the same ret ic l e or ienta t i on as that o f the p l ummet
c o l l imator 1 s ret i c l e .
col l imator ' s ,
remove
one-ha l f
the
error
w i th
the
Test
Instrument 1 s vert i ca l tangent screw and the other h a l f with
the coll imator ' s pos it ioning hand contro l . ( E l ectr ica l control
c ab l e on the l e ft s ide o f the meta l c ab inet . )
6.
7.
Repeat steps 4 and 5 unt i l the Test Instrument can be rotated
about its vert ical a x i s and the hor i z ontal ret i c l e l i ne o f the
Test I n strument stays i n reg i ster w i th that of the p l ummet
c o l l imator .
Focus the Test
co l l imator
Instrument on
the
( target with heavy ,
38
near target
b l ack ,
of
the
p l ummet
pa i red - l ine pattern ) .
8.
Use the l atera l adj usters on the mount ing pvst. to ach i eve
a ccurat.� reg i. ster between the Test Instrument i s ret icle and
that of the plummet r.:o l l imator ' s target .
Do not d i sturb the
vert ical tangent screw or l evel ing screws on the 'rest
Instrument .
9.
Rotate the Test I nstrument 1 8 0 0 about its vert ical axis and
bring the horizontal ret ic l e l ine back in reg ister w ith that
of the p lummet col l imator us ing the micrometer . I f the error
is less than O . 0 0 2 00 � no adj ustment is necessary . I f the error
is greater t.han 0 . 00 2 " , the Test I nstrument ' s standard must be
shi fted front to back .
Thi s i s performed as fol l ows :
A.
Loosen the a a l len-head s crews l ocated under the bottom
o f the standard of the Test I nstrument .
E ither us ing a
d ia l ind icator or by observ ing the amount o f travel wh i l e
s ighting through the scope f turn the a l l en-head screws
l ocated on the front and back of the Test I nstrument .
Note that the screws push aga inst the standard so the
screw oppos ite the pushi ng must be loosened .
B.
Tighten the 8 a l len-head screws on the bottom .
10 .
Repeat steps 3 through 9 unt i l the error i s no greater than
0 . 002 " .
11 0
I f adj ustments were made y the a f fected parameters mus t be
checked and adj usted a s requi red .
39
Descript ion :
The re flective surface o f the mirrors a re.
perpend icu l a r to the hor i zon'tal ax i s .
Tol erance :
± 1
Affected Parameters :
none
arcsecond
1.
Rough l ev e l the Test Instrument i f necessary
2.
Rotat e the Test Instrument about its vertical axis s o the
mi rror on the end of the hor i z ontal axis faces the a l ignment
tel escope mounted on the one s ide of the post .
Pos it ion the
Test I nstrument V s ma in scope such that oppos ing pa irs of axis
mi rror adj usting screws i n the mi rror mount f l ange are
oriented hori z onta l ly and vertica l ly . ( The ma in telescope wi l l
not necessar i l y be hori zontal or vert ica l . )
Leave the Test
I nstrument ' s vert ical tangent cl amp l oose dur ing the ent i re
test .
3.
S ighting
into
the
a l ignment
tel escope ,
ach ieve
an
autocol l imation image from the Test I nstrument ' s axis mi rror
by rotat ing the Test Instrument about its vert ical axi s . Lock
the vertical axis . Ach ieve precise autocol l imat ion us ing the
tangent screws on the a l ignment tel escope mount ing base .
4.
Plunge the Test I nstrument ' s tel escope 1 8 0 · and obse rve the
autoco l l imat ion error of both reticle l ines . I f the observed
e rror is l ess than 4 arc seconds , no adj ustment is neces sary
( note that the observed e rror is 4 times the actual error ) .
I f greater than 4 a rcseconds for any ret icle l i ne , correct ions
are performed as fol l ows :
5.
A.
Remove one-ha l f the error us ing the tangent screws and/or
level ing screws l ocated on the a l ignment tel escope ; s
mounting base .
B.
Remove the other ha l f o f the error with a l l en-head set
s crews l ocated on the mirror mount .
Adj ust opposi ng
screws by l oosening one and tightening the other .
Repeat step 4 unti l autocol l imat ion error
arcseconds or l ess for both ret icle l i nes .
40
observed
is
2
COLLlMATION- � FI X�D FOCUS CROSS SCOPE
De scr ipt ion z
The
cross
te l escope
l i ne-of-s ight
para l l e l to the hor i z ontal ax i s .
Tolerance :
± 1 a rc second
Af fected Parameters :
None
Note :
is
In thi s procedure e ither an M . T . C . or a l i ne scope can be
used as the reference scope ; th i s scope w i l l be re ferred
I f a l i ne scope i s used i t must be
to as the col l imato r .
set to i n f in i ty focus .
Turn
the Test Instrument ' s ma i n telescope
focus i ng knob
oppo s ite the d i rect ion marked !! I n f i n ityVV unt i l it stop s .
( To
ext reme near focus . )
2.
3.
4.
5.
6.
Turn the Test I n strument so that the obj ect ive le ns end o f the
cros s telescope faces the co l l imator .
S i ght the col l imator
with the cross tel es cope and trans it the Test I n strument ' s
ma in tel e scope unt i l the Test Instrument ' s c ross t e l e sc ope
ret i c l e l ines are exactl y para l l e l to those in the col l imato r .
The Test Inst rument ' s vert ica l tangent cl amp shoul d be l e ft
uncl amped for this ent ire test .
Ach i eve accurate reg ister between the vert ical ret i c l e l i nes
o f the Test Instrument ' s cross telescope and the col l imator
us ing the Test Inst rument ' s hor i z onta l tangent screw .
( The
hor i z ontal
ret i c l e
l i nes
should
a l so be
in
approx imat e
regi ster . )
0
Pl unge the Test Instrument ' s ma in tel escope 1 8 0 , aga in mak ing
cert a i n that the Test Instrument ' s cros s tel escope ret i c l e
l i nes
are pos iti oned
exact l y para l l e l
t o tho se
in
the
c o l l imator .
Obs erve any error in reg ister of the vert i ca l
ret i c l e l ines .
I f the obs erved e rror exceeds 2 arcsecond s ,
adj ustment is requ i red . Move the a l l en-head set-screws in the
cross t e l e scope obj ective lens mou n t ing fl ange to phys i ca l l y
push the l ens f rom s ide to s ide to correct th i s error .
Repeat steps 3 and 4 unt il n o error i n reg ister i s observed
when the Test Instrument ' s tel es cope is pl unged 1 9 0° .
Trans it the Test Instrument ' s ma in tel escope 9 0° , and pos ition
so that the Test Instrument ' s cross t e lescope ret i c l e l i nes
are exactly paral l e l to th ose in the col l imator .
( The Test
I nstrument ' s cross tel escope vert ical ret i c l e l ine has now
become hor i z ont al , a nd vice versa . )
41
7.
Repeat. steps 3 q
4 t 5 , and 6 in orde't' , un'til no error in
reg i ster is oDserved between t.he vert ical ret i c l e l ine of 'the
col l imator � and the Test InstrumGnt ' s cross telescope ret i c l e
l ines ( vert i c a l and horizontal l ines ) , when t.hey are in a
vertical pos ition.
Note g
the ver � i cal and hor i z ontal ret i c l e l ine col l imation
cal ibrations llre presented separately for e!!l.Sle of instruc tion ,
but
it
is
advmntaqeous
for
the
operator
to
do
both
s imu lt��eous ly as one �ffects the other .
42
fX·l�.LT MATION- -ADJUSTABLE l;:'QCU_$ CROSS SCOPE
Descript ion �
The cross tel escope l ine-ot-s ight
para l l e l t o the hor i z ontal axis ,
To l erance :
± 1 arcsecond
Af fected Parameters :
Hor i z ontal and vert ical
stra ightness ,
horizontal
centering
Note :
is
l ine-of-s ight
and vertical
I n th i s procedure e ither an M o T . C . or a l ine scope can be
used as the reference scope : thi s s cope w i l l be re f erred
to as the col l imator . I f a l ine scope i s used it mus·t be
set to infinity focus .
1.
Turn the Test I nstrument ' s mai n tel escope focusing knob
oppos ite the direct ion marked " In f in i tyVl unt i l it stops .
( To
extreme near focus . )
2.
Turn the Test Instrument so that the obj ect ive l ens end of the
cross telescope face s the col l imator .
Focus the Test
Instrument ' s cross tel escope at i n f inity and s ight the
coll imator ' s infin ity ret icle . T rans it the Test Instrument ' s
ma in te l escope unt i l the Test I nstrument 1 s cross telescope
ret i c l e l ines are exactly para l l el to those in the col l imator .
The Test Instrument ' s tel escope tangent clamp should be l e ft
Lock the hor i z onta l tangent
unc l amped for th is ent ire test .
c l amp .
3.
Ach ieve accurate reg ister between the vert ica l ret i cle l ines
of the Test Instrument ' s cross tel e scope and the col l imator
us ing the Test Instrument ' s hor i z onta l tangent screw .
( The
hor i z onta l reticle l ines should a l so be in approximat e
reg ister . )
4.
Plunge the Test Instrument i s main tel escope 1 8 0 0 � aga i n making
certain that the Test I nstrument 9 s cross te lescope reticle
l ines a re pos itioned exactly para l l e l to those in the
col l imator .
Observe any error i n reg ister of the vertical
ret icle l ines .
If the observed e rror exceeds 2 a rcseconds ,
adj ustment i s requ ired .
Move the Test I nstrument ' s cross
tel escope ret icl e adj ust ing screws ( a l len -head cap screws
under shrouding on eyep iece end o f cross tel es cope ) to correct
thi s error .
5.
Repeat steps 3 and 4 unti l the error i s within tolerance a s
observed when the Test Instrument ' s ma in tel e scope i s plunged
1800 •
43
6.
Trans it the Test Inst rument ' s ma in tel escope 90° ,
and pos i tion
so
that the Test Instrument ' s cross tel escope ret icle lines
are exact l y para l l el to those in the col l imator .
( The Test
1nst.rument 0 s cross tel escope vert i ca l ret ic l e l ine has now
become hor i z onta l, and vice versa , )
7.
Repeat steps 3 , 4 ,
5, and 6 in order , unt i l the error i n
reg ister is with in tolerance as obse rved between the ret icle
l i nes of the co l l imator I
and the Test Instrument e s cross
te lescope ret i c l e l ines ( vert ical and hor i zonta l lines ) when
they are in the vert ical posit ion.
Note :
the vert ical and ho ri zont a l �eticlo l i ne col l imation
cal ibratiolll s are prGsented sepmrately for ecse of instruction S'
but
it
is
advantaqeou9
for
tbe
operator
to
do
both
simu ltaneously as one affects the other �
44
I,INE-QF-S IGH'l' STRAIGHTNESS �..Nl2 CENTERING.
f.\DJUSTABLE FOCTJS CROSS S COPE
Descript i on �
Tol erance :
Stra ightness :
Centering :
Affected Parameters :
The
l ine-of-s ight
is
stra ight ,
both
vertica l ly and hor i z onta l l y , throughout
-the focus ing range and centered to the
mechan ical axi s o f the barre l .
± . 00 2 inch , or ± 2 a rcsecond , wh ichever
is greater
± . 00 2 i nch
Al l
1.
Determine that col l imation at infinity focus i s acceptab l e .
2.
Pl ace the Test I nstrument u s ma in te l escope in the d irect
posit ion . With the Test Instrument ' s cross tel escope opt ical
m icrometer set prec isely at z ero , focus the cross telescope on
the 4 - ft . M . T . C . target .
Make certain that the cross
telescope ret i c l e l ines are exactly para l l e l to those in the
M.T.C.
3.
Us ing the Test Instrument ' s hori zont a l tangent screw , ach ieve
accurate
register between the Test
Instrument ' s
cross
tel escope vert ical ret icle l ine and the M . T . C . 4 - ft . target .
( The hor i z onta l ret icle l ines should a l so be approximately in
register . )
4.
5.
Plunge the Test Instrument ' s ma in tel escope 1 8 0 0 to the
indirect pos ition , aga in making certa i n the Test Instrument ' s
cross tel escope ret icle l ines are exact ly para l l e l to those in
the M . T . C . Mea sure and record any observed e rror in register
on the vert ical reticle l ines using the Test I nstrument ' s
cross tel escope opt ical micrometer or wedge .
Return the Test I nstrument ' s ma in tel escope to the d i rect
pos ition , and repeat steps 2 through 4 us ing the 1 6 - ft . M . T . C .
target , as we l l as any other M . T . C . targets deemed necessary
or desirab l e .
YOU
HAVE NOW TAKEN READINGS TO DETERMINE STRAIGHTNESS AND CENTERING
OF THE LINE-OF-SIGHT IN A HORI ZONTAL DIRECTION . READINGS MUST ALSO
BE TAKEN TO DETERMINE STRAIGHTNESS AND CENTERING IN A VERTI CAL
DIRECTION .
6.
Turn the Test Instrument O s cross te les cope opt ical micrometer
9 0° on the end of the tel escope barre l .
45
7 .
Repeat steps 2 ,
3 , 4 , and 5 , th i s t ime start i ng w i th the Test
Instrument � s ma in telescope at 9 0° from its original pos i t i on
For example , start w ith t.he ma in t e l escope point ing
achieve reg i ster , pl unge 1 8 00 , take measurement, etc .
( d irect ) .
up ,
8.
For any target , ha lf the error observed at step 4 of th i s
procedure i s the actual devia t i on o f the Te s t Instrument v s
l ine-of-s ight from a straight line at that foca l distance .
If
the actual error exceeds . 0 02 inch at the 4 or 1 6-ft . targets,
or 1 arcsecond at any target farther away than 17 ft . , the
Test Instrument shoul d be returned to the manufacturer for
repa i r .
46
PRECISION SIGHT LEVELS
Brunson model nos .
47
545 ,
545 - 1 .
�.TJLL ' G EYE. OR CIRCUL.l\P. LEVl;; L . VIAL
-
Descript ion :
of
surface
vial
"Read ing"
pe rpend icul ar t o the vert i c a l d x i s .
Tol erance :
Bubbl e stays with i n black l i nes
A f fected
None
1.
2.
Parameters :
Use the Test Instrument ; s
bubble is centered .
Rotate the Test
level ing
screws
to
adj ust
is
unt i l
Instrument ' s about its vert ical a x i s 1 8 00
-­
observe bubble .
3
n
4.
Correct one-h a l f the bubb l e center ing e rror with the v i a l
mount ing screws , and the other ha l f with the Test Instrument ' s
l evel ing screws .
Repeat steps 2 and 3 unt i l no error i s observed i n the v i a l
when the Test Instrument i s rotated about its vert ical axis .
48
VEH'l'I CA):. AXI S .... BEARIN4. RTJNOU'f
Descr ipt i on �
I nstrument. rotates accurate l y about. i t s
vert ical .� xis to d esc ribe a hor i z ontal
plane .
Tol erance :
5 . 0 arcseconds
Affected Parameters :
All
Note:
1.
2.
In this procedure either an M . T. C. or a l ine scope can be
used as the re ference scope ; th is scope w i l l be referred
to as the c o llimat or e
I f a l i ne scope is used , it must
be set to inf i nity focus.
Focus the Test Instrument ' s t e l escope at i nfin ity , and us ing
the t e l escope tangent screw , ach i eve accurate reg i ster between
the
Test
Instrument ' s
horizontal
re ticle
line
and
the
coll imator ' s i nf i n i ty target .
w i th the Test Instrument ' s horizontal tangent cl amp l oosened ,
0
gent l y rotate the Test Instrument about i ts vert ical ax i s 3 6 0
unt i l the col l imator is aga i n s ighted .
3.
Observe any error in regis te r between the horizontal re ticle
l i nes o f the Test Instrument and co l l imator.
4.
Repeat steps 2 and 3 at least 4 more times .
( This a ssures the
i nd ividua l ba l l s in the vert i cal ax is bear i ngs have a l l made
at l east one compl ete revolut i on . )
5.
I f the error in register remains 5 arcseconds or less , results
are accep t ab l e .
If �n error greater than 5 arcseconds i s
observed , repairs are required and the Test I nstrument should
be returned to the manufacturer .
49
RETICLE ORI ENTATION
Descript ion :
Hor i zontal reticle l ine
to the vert ical axi s .
Tol erance :
± 2 . 0 arcseconds
Affected Parameters :
Line-of-s ight
Level Vial
Note :
1S
perpend icular
stra ightnes s ,
coinc idence
I n thi s procedure e ither an M . T . C . or a l ine s cope can be
used as the re ference scope ; thi s scope w i l l b e re ferred
to as the col l imator . I f a l ine scope i s used it mus t be
set to inf inity focus .
1.
Leve l the Test Instrument using the Bul l ' s-eye Level .
2.
s ight the col l imator and focus on the infin ity ret i c l e . Br ing
the Test Instrument ' s ret icle into prec ise reg i ster with the
i n f in ity ret i c l e of the col l imator us ing the Test Instrument ' s
tangent screws .
3.
Observing a point on the col l imator ' s ret i cl e , use the Test
Instrument ' s hor i z ontal tangent screw and " track" across that
point . Notice whether the ret i c l e l ine s tays in register with
or deviates from the point .
4.
I f dev iation i s observed , note wh ich d irect ion the Test
I f error i s more than the
Instrument ' s ret icle is t i lted .
tol erance , use a dr i ft and sma l l hammer to tap aga inst the
adj usting screw heads of the Test Instrument I s ret i c l e to
rotate the ret i c l e into pos it i on . These are the four capstan­
head screws farthest from the eyep i ece and pos it ioned at 1 2 ,
3 , 6 , and 9 o ' cl ock .
When adj us ting , tap aga inst oppos ing
screw heads , 12 and 6 or 3 and 9 , for even adj ustment to the
ret i cl e ( re fer to the picture in the trans it sect ion regarding
ret i c l e ori entation ) .
5.
Repeat steps 1 , 2 , and 3 unt i l the Test Instrument ' s ret i c l e
l ine stays i n tol erance with the point .
50
HO:ij,J ZONTAL LI NE-OF- SJ,GHT STRAIGH'ItNt�12�
De s c r i pt i on :
\.line-of-s ight i s stra i ght. throughout. the
focus i ng range as measured f rom the
vert ica l ret icle l ine .
Tol erance :
±
Af fected Parame ters :
Line-o f-s ight
vertical
stra ightness p
coinc idence vial , and ret icle orientat ion
1.
. 0 0 1 i nch , or ± 1 arcsecond , wh ichever
is greate r .
Veri fy that the target ret i c l es i n the M . T . C . are all truly
on a stra ight l ine . Thi s may be done in two ways �
1 } cal ibrate and adj ust the M . T . C. us ing the procedure g iven
in DCOperat ion I nstruction and Ma intenance Manual for Model
270 - BN
Un iversal
S hort-Rang e Cal ibrator . "
2)
Use
an
instrument whose l ine-of-s ight i s known to be stra igh t to
determ ine t h e relat iv e pos i t i ons o f the M . T . C . t a rgets .
p os i t i oned
2 .
T e st I nst r ument ' s telescope at i n f inity , and us ing
the
hor i z ontal
t angent
screw , achieve accurat e reg i ster
be twe e n the Te st Instrument ' s vert i c al ret icle l ine and the
M . T . C . i n f inity target ( hori z onta l ret i c l e l ines shou l d also
be approximately in reg ister . )
3.
Focus t he Test Instrument ' s telescope on the 4 - ft . M . T . C .
target . Make certain the opt i c al micrometer is set prec i s ely
at z ero .
I f an out - o f-reg ister cond i t i on ex i s t s ,
use the
l a t e ra l s l ide on the T e s t Instrument ' s mount ing p o s t to
a ch i eve
a ccurate
regi st e r
b e twe en the Test Instrument ' s
vert ical ret icle l ine and the 4 - ft . M . T . C . target .
(Aga in ,
the hor i z ontal ret icle l ines should be app rox i mately in
r egister . )
4.
Repeat steps 2 and 3 unt i l the Test Instrument ' s telescope can
be focused at e ither inf i nity or 4 f t . , and the ve rtic al
ret i c l e l ines rema in in register w i th no man i pu l a t i o n .
5.
Without d isturbing tangent screws , l ateral s l ide , or pre c i s ion
l i ft , take readings with the opt ical micrometer for any out­
o f - r eg ister condition observed at the 1 6 - ft . M . T . C . target ,
and any other targets deemed necessary or des irab l e .
These
read ings a re the amounts by wh i ch the Test Instrument ' s l ine­
of-s ight dev iat es f rom a st ra ight l ine a t tho s e d istances o I f
a reading is greater than . 00 1 inch at the 1 6-ft . targe t r o r
1 arcsecond a t the more distant targets , the Test Inst rument
should be r etu rn e d to the manufacturer for adj ustment .
Focus the
51
VE.BJ'I CAL LIN];� OF�SIGHT fJ'rRAIGHTNESS
Descript i<::m :
Line-of-s ight i s stra ight throughout the
focus ing range when measured f rom the
hor i z ontal ret i c l e l ine .
Tolerance :
± . 0 0 1 inch
greater .
Af fected Parameters :
Hor i zontal l ine-o f-s ight straightness ,
coincidence v i a l , and ret i c l e orientat ion
or
1
arcsecond , wh ichever is
1.
Turn the opt ical micrometer
e l evation read ings .
2.
Ver i fy that the target reticles i n the M . T . C . are a l l truly
pos it ioned on a straight l ine .
( See step 1 of the procedure
for hori z onta l l ine-of-s ight stra ightness .
30
Focus the Test Instrument ' s tel escope at i n f inity , and us ing
the vertical tangent screw , achieve accurate reg ister between
the Test Instrument ' s hori z ontal ret icle l ine and the M . T . C .
infinity target (vertical ret icle l ines should a l so
be approximately in register . )
4.
Focus the Test I nstrument i s tel e scope on the 4 - ft . M . T . C .
target . Make certa in the opt ical micrometer is set prec isely
I f an out-of-regi ster condit ion exists , use the
at z ero .
precis ion l i ft in the Test Instrument ' s mount i ng post to
achieve accurate reg ister between the Test Instrument ' s
hor i z ontal ret ic l e l i ne and the 4 - ft . M . T . C . target .
( Aga in ,
the vertical ret icle l ines should be approx imately in
register . )
5.
Repeat steps J and 4 unt i l the Test I nstrument ' s tel escope can
be focused a t e ither inf inity or 4 ft . , and the hor i z onta l
ret icle l ines remain in register with no man ipulat ion .
6.
Without disturb ing tangent screws , l atera l s l ide , or prec i s ion
l i ft , take read ings with the opt ical mi crometer for any out­
of-reg ister cond it ion observed at the 1 6 - ft . M . T . C . target ,
and any other targets deemed necessary or desirable .
These
readings a re the amounts by wh ich the Test Instrument 9 s l ine­
of-s ight deviates from a stra ight l ine at those d i stances . I f
a reading i s greater than . 0 0 1 inch a t the 1 6 - ft . target , or
1 arcsecond at the more d i stant targets , the Test I nstrument
shoul d be returned to the manufacturer for adj ustment .
52
,to
the
position
su itab l e
for
COINCIDENCB
LEVEL VIALS
Brunson mode l nos .
53
194 ,
1 9 4 -T .
COINCI DENCE l,EVEL VIA..IJ
coincidence l evel v i a l s are found attached to the t�l escope barrel
on pre c i s e l evel s , j ig trans its , trans it sqt-1�\re s , and opt i c a l
tool ing theodol ites .
This procedure appl ies t o any of the s e
sevenl l types o f instrument s .
Two separate gravity-level references are provided for use w i th the
model 2 7 0 - BN cal ibrat ion test stand . One i s the model 1 8 7 -S stride
l evel .
The other i s the mode l 2 8 7 - 1 l evel ing mirror .
Procedures
for use with both these references are g iven here .
COINCIDENCE LEVEL VIAL ADJUSTMENT US ING THE MODEL 1 8 7 -S S TRIDE
LEVEL AS A REFERENCE
NOTE :
THE MODEL 1 8 7 -S STRIDE LEVEL , AND THE COLLIMATOR OR LINE
SCOPE ON WHI CH I T I S PLACED ( HEREAFTER REFERRED TO AS
" THE LEVEL-REFERENCE COLLIMATORIi )
MUST BE IN GOOD
ADJUSTMENT TO OBTAIN ACCURATE RESULTS . E ITHER THE M . T . C .
OR THE MODEL 8 1 LINE S COPE MAY BE USED AS THE LEVEL­
REFERENCE COLLIMATOR .
( SEE "OPERATION INS TRUCTION AND
MAINTENANCE MANUAL FOR MODEL 2 7 0 -BN UNIVERSAL S HORT-RANGE
CALI BRATOR" FOR CALI BRATION PROCEDURES . )
1.
Veri fy that
the
l evel -re ference col l imator
is
in
fact
accurately l eve l ed us ing the mode l 1 8 7 -S stride l eve l .
( Se e
procedures referenced above . )
I f the model 8 1 l ine scope is
used , i t must a l so be focus ed accurate ly at infinity .
2.
S ight
the
l evel -re ference
col l imator
with
the
Test
Instrument 8 s telescope accurately focused at i n f i n ity . Using
the telescope tangent screw , achieve accurate regi ster between
Instrument ' s hori z ontal
ret i c l e
l ine and the
the Test
hori zontal ret i c l e l ine of the l evel -reference col l imator .
( The vert ical reticle l ines shou l d a l s o be in approximate
reg ister . )
3. '
Observe any error in the Test Instrument ' s coinc idence l evel
vial . Th i s e rror may be corrected us ing the nuts securing the
vial case to its mounting studs .
Thes e nuts shoul d be qu ite
tight p and wi l l be easier to t ighten or loosen if two
adj ust ing p ins are used on one nut at the same t ime .
4.
A fter any movement o f the coincidence v i a l mounting nuts , re­
ver i fy the register of the Test I nstrument ' s hori z onta l
reticl e l ine with that o f the l evel - re ference col l imator .
5.
Repeat steps 2 ,
3,
and
4
unti l the Test Instrument ' s
coinc idence vial shows no error when the hor i z onta l ret i c l e
l ines are exact ly in reg i ster .
54
COI NCIDENCE LEVEL VIAL ADJUSTMEN'I' USING TtfE MODEL 2 8 7.-l LEVELING
MIRROR
NOTE :
THE MODEL 2 8 7 - 1 LEVELING MIRHOR MUST BE I N ACCURATE
ADJUSTMENT FOR THIS TEST .
THI S ADJUSTMENT SHOULD BE
ACCOMPLISHED WHILE THE MODEL 2 8 7 -1 IS IN POSITION ON ITS
S HELF ON THE TARGET POST OF THE MO DEL 27 Q-BN TEST STAND .
( S EE
HOPERATION
INSTRUCTION
AND
NOT ELSEWHERE .
MAINTENANCE MANUAL FOR MODEL 2 7 0 - BN UNIVERSAL SHORT-RANGE
CALIBRATOR!O FOR THI S ADJUSTMENT )
THE MODEL 2 8 7 - 1 MUST
BE CHECKED FOR ACCURATE ADJUSTMENT EACH TIME I T I S USED
IN ORDER TO MAINTAIN MAXIMUM ACCURACY .
0
Any Test Instrument to be inspected using thi s procedure must have
autocol l imation capab i l ity .
1.
Ver i fy that the model 2 8 7 - 1 l evel ing mirror i s in
accurately adj u sted .
( See procedure re ferenced above . )
2.
With the proper l ighting attachment for the Test Instrument in
question , sight the Test Instrument at the model 2 8 7 - 1 m irror
and
achieve
accurate
autocol l imati on
us ing
the
Test
Instrument ' s tangent screws . Pay particu l ar attent ion to the
accuracy of autoco l l imation of the hori z onta l ret i c l e l ine .
3.
Observe any error in the Test Instrument ' s co inc idence l eve l
v i a l . Thi s error may be corrected u s i ng the nuts securing the
vial case to its mount ing studs .
The se nuts shou l d be quite
t ight , and w i l l be easier to t ighten or l oosen if two
adj usting p ins are used on one nut at the same t ime .
4.
A fter any movement o f the coincidence v i a l mount ing nuts , re­
ver i fy autocol l imati on , particularly that of the hori z onta l
ret i c l e l ine .
5.
Repeat steps 2 ,
3,
and 4
unti l
the Test Instrument ' s
coincidence v i a l shows no error when the hor i z onta l ret i c l e
l ine i s per fect ly autocol l imated .
55
fact
ALIGNMENT TELESCOPES
Brunson model nos .
81,
" -1 " ,
83 ,
or
381,
i n c l ude mode l s with
" -M" su ffix .
56
I NI TIAL S ET�UP
In order to mount. a l ine scope or a l ignment scope on the Test
Instrument ' s mount ing post o f the model 2 7 0 - BN I a su itable "vee"'
mount ing base must be used .
'I'hi s unit should provide adequate
rigid ity I and have tangent screws or some other means of f ine
A Brunson model 88 or 8 9 � 6 i s suggested .
angular adj ustment .
1.
pos ition the mount ing base on the Test Instrument ' s mount ing
post so that the M . T . C . may be s ighted by the Test Instrument �
2.
Focus the Test Instrument at infinity and s ight the M . T . C .
infinity target s
Use the tangent screws on the Test
Instrument � s mounting base to achieve approximate regi ster
between the Test Instrument ' s ret i c l e and the M o T . C . i n finity
target .
3.
F o c us
the Test I nstrument on the 4 - ft . M . T . C . target . Use the
l a teral s l ide and precis ion l i ft in the Test I nstrument I S
mount ing post to achieve approximate reg ister between the Test
Instrument ' s ret icle and the M . T . C . target .
( I f the amount o f
adj ustment requ ired i s beyond the range of movement of the
prec i s i on l i ft , use the handwheel to move the ent ire mount ing
post up or down unt i l within the precis ion l i ft ' s range . )
4 .
Repeat steps 2 and 3 o f thi s procedure unt i l the Test
Instrument can be focused at e ither infinity or 4 ft . , and the
Test I nstrument ret icle rema ins in approx imate regi ster with
no manipu l at ion .
Initial set-up is now accompl i shed , and
cal ibration may proceed .
NOT E :
IN THE CASE OF
MI CROMETER ,
THE
AN ALIGNMENT TELESCOPE WITH
MI CROMETER ACCURACY MUST B E
BU I LT - I N
VER I F I E D
FIRST I N ORDER T O OBTAIN VALID RESULTS IN CALI BRATING THE
ALIGNMENT
TELE S COPE
MI CROMETERS
MAY
BE
TELES COPE .
CALI BRATED
U S I NG
THE
PROCEDURES
FOR
DETACHABLE
MI CROMETERS FOUND ELSEWHERE IN THIS MANUAL ,
WITH THE
FOLLOWING EXCEPT I ONS :
1)
FOR THE QD Z ERO-CENTERoO CALI BRATION TEST ,
THE
°
ENTI RE TELESCOPE MUST BE ROTATE D 1 8 0 , S INCE
THE
MI CROMETERS
S COPE .
2)
ARE
INTEGRAL
PARTS
OF
THE
THERE IS NO ADJUSTMENT FOR "MI CROMETER SCALE
I F A MICROMETER I S I N ERROR DURING
ACCURACY " .
THIS TES T ,
THE ENTIRE INSTRUMENT SHOULD BE
RETURNED TO THE MANUFACTURER FOR REPAIR .
57
Description :
'rhe l ine-oi-s ight i s para l l el to tIle
barre l
outs ide
d iame"ter
at
i n f i n ity
focus .
Tolerance :
±
1 arcsecond
Affected Parameters :
Line-of-s ight stra ightnes s and centering
I n this procedure e ither an M . T . C . or a l ine s cope can be
u sed as the reference scope : thi s scope w i l l be referred
to as the col l imator .
I f a l ine scope is used o it must
be set to infinity focus .
Note :
1.
Focus
the
Tes t
I nstrument
col l imator O s inf in ity target .
2.
Use the target screws on the Test Instrument ' s mounting base
to ach ieve accurate reg i ster between the Test Instrument ' s
vert ical ret icle l ine and the col l imator ' s inf inity target .
( The Test Instrument ' s hor i z ontal ret icle l ine shou l d a l so be
in approximate register . )
3.
inf inity
and
s ight
the
Rotate the Test I nstrument 1 8 0 0 about its center l ine .
The
vertical reticle l ine should aga in be in register . I f an out­
o f-regi ster condit ion exists , correct ha l f of the observed
error us ing the Test I nstrument ' s ret icle a d j usting screws .
( S ee page A- 1 6 . )
NOTE :
4.
at
ON THE MODEL 8 1 AND 3 8 1 ALIGNMENT TELESCOPES ,
THE RETI CLE ADJUSTING S CR�WS ARE ALLEN-HEAD
SET SCREWS LOCATED AT 9 0
FROM EACH OTHER
AROUND THE TELESCOPE BARREL .
THE FOUR S CREWS
CLOSEST TO THE EYEPI ECE ADJUST THE ERECTOR
LENS ASSEMBLY , AND THE NEXT SET OF FOUR , JUST
FORWARD OF THESE , ARE THE RET I C LE ADJUSTING
ON THE MODEL 8 3 ALIGNMENT TELESCOPE ,
SCREWS .
THE RETICLE ADJUST ING S CREWS ARE ALLEN-HEAD
S ET SCREWS LOCATED UNDER COVER S CREWS IN THE
BALL-SHAPED MOUNTING OF THE MICROMETER AND
FOCUS ING KNOBS , AT THE REAR OF THE BARRE L .
Repeat steps 2 and 3 of th is procedure unt i l no error in
reg i ster is observed on the vertical ret i c l e l ine when the
Test Instrument is rotated .
58
5.
Rotate tha Test I nstrulnent 9 0° about
6.
Perform steps 2 , 3 , 4 , and 5 of this procedure a s necessary
unt i l no error in reg ister is observed for e ither ret icle l ine
in the Test Instrument .
its centerl ina.
Repeat
steps 2 , 3, and 4 of thi s procedure for that ret i c le l ine now
in the vert ical pos it ion.
Note :
the vertical &na hori zontal reticle l ine col l im3tion
cal ibrMtions mre presented aGipar�tely for ense of instruct ion ,
but
it
is
advantaqeous
for
th�
operator
to
dQ
both
s imul taneou£ly as one a f fe c ts the otber o
59
f.:OMBINJ� D LINE-OF'- S I GJ:I'l' STRAJGHTNESS AND CENTERING
De scr ipt ion :
Tolerance :
s tra ightnes s :
cent e r i ng :
Af fected Parameters :
NOTE :
1.
2.
{li ne-·of-s ight
is
s t ra ight
as mea sured
from both the vertical and hor i z onta l
ret icl e l i nes at a l l focal d i stances .
The l i ne-of-s ight i s a l so concentric to
the barrel out s ide d i ameter .
± . 0 0 1 inch ,
is greater
± . 0 0 1 i nch
or ±
1 arc second ,
wh ichever
Al l
COLLIMATION AT INFINITY FOCUS MUST BE PROPERLY ADJUSTED
BEFORE PERFORMING THI S TEST .
Focus the Test I nstrument on the 4 - ft . M . T . C . target .
I f the
Test Instrument has m icrometers , make certain that the Test
Inst rument ' s ret i c l e l i ne a re exact ly pa ra l l e l to those on the
M . T . C . target .
Use the tangent screws in the Test Instrument ' s mount ing base
to ach ieve accurate reg ister between the Test I n strument ' s
vert i ca l ret ic l e l i ne and the M . T . C .
target .
( The Test
Inst rument ' s
hor i z onta l
ret i c l e
l ine
shou l d
a l so
be
approximate ly i n reg i ster . )
3.
0
Obs e rve
Rotate the Test Instrument 1 8 0 about its centerl ine .
any error in regi ster between the Test I nstrument ' s vert ica l
( I f the Test Instrument
ret i c l e l ine and the M . T . C . target .
has m icrometers , me asure th i s error .
Otherwi s e , the error ' s
magn i tude must be est imated . )
4.
0
Rotate the Test In st rument 9 0
about its
repe at steps 2 and 3 of thi s procedure .
5.
6.
7.
centerl ine .
Focus the Test I ns trument on the 1 6 -ft . M . T . C . target .
steps 2 6 3 , and 4 of th i s procedure .
Repeat steps 2 , 3 , and 4 o f th i s procedure
targets de emed necessary or des i rab l e .
for
any
Now
Repeat
other
For any target , ha l f the error observed at step 3 o f th is
procedure i s the actual dev iat ion of the Test I nstrument ' s
l i ne -oi- s i ght from a stra ight l i ne at that foca l d i stance .
If
the a ctua l error exceeds . 0 0 1 inch at the 4 or 1 6 - f t . target s ,
or 1 arcsecond at any target farther away than 17 ft . , the
Test Instrument shou ld be returned to the manu facturer for
repa i r s .
60
Description :
Target
is concentric to
d i amete r of the barre l .
rfolerance :
± . 0 0 1 inch .
A ffected Parameters :
None
the
outs ide
10
Point the Test I nstrument at the model 8 1 a l ignment telescope ,
mounted to the s ide o f the M . T . C . on the model 2 7 0 -BN target
post .
2.
Use the model 8 1 a l ignment telescope to s ight the Test
Instrument ' s auto-ref l ection target .
(A l ight ing attachment
must be used in the Test I nstrument )
Achieve accurate
reg ister between the model 8 1 al ignment tel escope ret icle and
the Test I nstrument O s auto-re flection target .
3.
Rotate the Test I nstrument 1 800 about its centerl ine . Observe
any error in reg ister between the model 8 1 al ignment ret i c l e
and the Test I nstrument ' s auto-re f lection target .
Hal f the
observed error is the actua l error which must be corrected to
make the auto-re f l ect ion target concentric w ith the Test
Instrument ' s centerl ine .
( NOTE :
the d i stance between l ine
centers o f the sma l l est part of the auto-re flect ion target
pattern is approximately . 0 10 inch . )
4.
I f the actual error in concentric ity o f the auto-re f l ection
target exceeds . 00 1 inch , use the target adj ust ing screws
( four
al len-head
set
screws
l ocated
around
the
Test
Instrument ' s tel escope barre l , farthest from the eyep iece ) to
move the auto-ref l ection target in the proper direction .
5.
Repeat steps 2 , 3 , and 4 o f thi s procedure unt i l no e rror i s
observed at step 3 .
61
APPEN DI XES
D! TRAN S I T HORI ZONTAL AX IS
VI
ADJUSTMENT'i
ADJ USTING A TRANS I T STANDARD"
GLOSSARY OF TERMS
LIST OF TOOLS
REQUIRED FOR INSTRUMENT A DJUSTMENT
I LLUS TRAT IONS
A
-
1
1.
2.
Determ in e the amount o f e rro r in perpend icu l a r ity b etwe en the
Test Inst rument I s hor i z ontal and vert ical axes .
Determine
a l so the d irect ion o f th i s error :
whi ch end of the hor i z ontal
axis i s " h i 9hv� o r " l ow '� ,
( S ee page 3 5 o f the ca l ibrat ion
procedures . )
( 2 0 a r csec ond s or l es s ) v t h e a x i s
I f t he error i s sma l l
adj us t i ng screw ( c ap s tan - he a d screw l ocated in the standard
d i re c t l y beneath one ho r i z onta l ax i s bear i n g ) may not need to
be d i sturbed .
Sma l l errors a re genera l l y correctable s imp l y
by app l y ing more torque or l e s s torque to the axis bear i n g cap
screws ( cap screws se cu ring the h or i z onta l ax i s bear ing caps
They may be e i ther s l otted or
to the top o f the standard
a l l en-head v depend ing on the instrument g s age .
Re fer to the
p i cture in the ca l ibration sect i on for Pl umb Line start ing at
page 3 5 )
0
3.
the a pp r opr i a te sc rews , ra is e or lower an end o f the
I f the axis
Test Instrument ' s hor i z ontal a x i s as neces s a ry .
adj usting screw is used , the axis bear ing cap screws must be
man ipul ated i n conj unct i on w i th the adj ust ing s c r ew .
Us i ng
I f only the a x i s bearing cap screws are used , take care to
ma in t a i n proper torque .
Too l it t l e torque cau s es l oo seness,
and a l l accuracy is lost .
Too much torque can dama g e the axis
be a r i ng o
I f an axis bearing cap screw must be
l oo sened
adj ustment r turn i t past the des i red point , and
t ight en to proper a d j ustment e
4.
for th i s
then re­
After any ad j u st m e n t i s made , the ent i re test for re l a t io n ship
o f horizontal axis to vert ical axis must b e p e r f o rmed aga i n .
A
- 2
,!'kANS IT S T�.NDARD JilXUJSTMEN'l'
CAUT ION :
BEFORE ATTEMP'l' ING TH I S ADJUSTMENT � MAKE CER.TAIN
THAT IT IS REALLY NEEDED .
MOVEMENT OF THE STANDARD
WILL NOT COMPENSA'£E FOR A Line-of-s ight WHICH I S
NOT STRAI GHT .
MOST INS TRUMENTS DO NOT REQU IR.E THI S
ADJUSTMENT
UNLESS
DAMAGE
OR
TAMPERING
HAVE
OCCURRED
0
1.
Make cert a i n that the Test Instrument i s l i ne -of-s ight is in
fact stra ight with i n acceptab l e tolerance s .
( S ee page 2 8 and
3 0 of the cal ibrat ion procedure s . )
2.
Determine the exact amount by wh ich the l ine-of-s ight i s not
cente red over the instrument ' s vert ical ax i s .
( S ee page 32 o f
the cal ibration procedures . )
3.
Mount the Test Instrument on a sturdy , stab l e bas e , and make
prov i s i on for mount ing a d i a l test indicator near enough to
conta c t the base o f the Test Instrument I s s tandard .
The
indi cator movement ' s travel shou ld be para l l e l to the des i red
directio n of movement .
4 .
S l ight ly l oosen the a l l en-head cap screws holding the standard
to the p l ate
( re fer
to the picture s
in
the Hori z o nta l
Center i ng ca l ibration procedure start ing at page 3 2 ) .
5.
with the hor i z onta l tangent c lamp t i ghtened and the indi cator
" z eroed " against the base of the standard , move the e nt i re
upper part o f the Test Instrument in the proper d i rect ion to
correct the l ine-o f - s ight center ing error .
A.
For a l l model s except 7 9 and 3 7 9 ,
th is movement i s
accomp l i shed
by
turni ng
the
a l l en-head
cap
screws
threaded hor i z onta l l y into the p l a t e j ust be l ow the
standard .
T ighten i ng one of the s e sc rews causes the
standard to move in the s ame d i rect i o n as the s c rew .
( Do
not neglect to l oosen the adj ust ing sc rew in the oppos ite
s ide . )
B.
For mode l s 7 9 and 3 7 9 ,
use a Ui soft'6 hammer
(e.g. ,
p l as t i c , rawhide , rubber , etc . ) to tap the base o f the
standard in the proper directi on .
( Even with the d i a l
indicator there i s o f nece s s i ty more ii t r i a l and error" i n
moving the s tandards o f the se instrumen ts , due to the
shock e f fect of us ing the hammer . )
A
-
3
6,
Without disturbing the Test Instrument more tha n absolutely
necessary , re-t ighten the cap screws h o l d i ng the standard to
the plate .
7.
He-inspect rel at ionsh ip of hor i zontal a x i s to vert i c a l axi s ,
and front-to-back centering--ho l l ow vert i ca l a x i s
.
A
-
4
GLOSSARY Qf-. TERMS .l>.N"D ABBREVIAl'IQ1§
.�LI GNMENT rl'EI,ESCOPE
An opt ical too l ing te l escope used to establ i shed opt ical
refoarence l ines . Its outer diameter i s accurately contro l led
f o r pre c i s ion in mounting , and its l ine-of-s ight i s exactl y
pos i tioned o n
its mechanica l
center l ine .
Al ignment
telescopes may have integral or separate opt ica l micrometers
for measur ing l inear displ acement .
AUTOCOLLlMATI ON
Reg i ster of an instrument ' s reticle with its own refl ected
when the instrument is focused at i n f i n i ty .
Ach ieved by
us ing a l ight ing attachment to proj ect an image o f the ret icle out
of the tel escope . Th i s image is then ref lected from a m irror , back
into the t e l escope , and superimposed on the retic l e .
i m ag e ,
AZIMUTH
A h o r i z o nt a l angl e .
COLLINEAR
L i t e ra l l y , " on the same l ine - o f - s ight " .
Two tel escopes are
co l l inear when they are phys ica l ly p l aced on the same center
l i ne c
D i f fers from !t c o l l imated " wh ich means "para l l e l " .
COLLIMATE
To make two instrument s ' l ines of s ight para l l e l , when focused
at i n f i n i ty and fac ing each othe r .
co l l ima t i on , a lways imp l ies i n f i n ity
The word col l imate ,
focus .
or
COLLIMATION
The
cond i t i on o f being col l imated .
COLLIMATOR
A tel escope- l ike
instrument f ixed at infin ity focu s , and
hav ing one or more reticle s to be sighted a s reference targets
by the Test
Instrument .
DIRECT POS I TION
Descr ibes the pos i t ion of a trans it-type i n s trument in wh ich
the telescope is pos i t i oned with the focus ing knob on the top ,
and the precise l evel v i al on the bottom .
EYEPI ECE
of a telescope into which the observer l ooks .
i s norma l l y prov ided to a l l ow the eyepiece to be
moved i n or out so that accurate focus on the p l ane of the
ret i c l e may be ach ieved .
That
part
Adj ustment
A
-
5
FOCU$lJ�G LENS
That l ens contained in the focusing slide inside a t�l escope
barre l .
Movement of this lens a l ong the l e ngt.h of 'the
telescope bore al l ows images of obj ects at varying distances
from the tel escope to be focused on the pl ane of the reticl e .
FOCUS ING SLIDE
The mechanism by which the focusing l ens
ins ide the bore of a tel escope barrel .
is
held
and moved
HORIZONTAL AXIS
On transit-type instruments , the mechanica l axis by which the
t e l escope barrel mounted in the standards.
HORI ZONTAL RETICLE LINE
The line or l ines of the reticl e which lie hor izonta l l y when
the Test Instrument is mounted upr ight .
HORI ZONTAL TANGENT CLAMP
The clamp j ust at the top of the spider
instrument rot ation about the vertical axis.
which
contro l s
HORI Z ONTAL TANGENT SCREW
S l ow-mot ion or
tangent clamp.
axis .
f ine adj ust ing screw found in the hor izonta l
Used for prec ise rot a tion about the vert ical
INDIRE CT POSIT ION
Descr ibes the position of a transit-type instrument in wh ich
the tel escope is pos itioned with the focusing knob on the
bottom , and the precise level v i a l on the top .
I N F INITY FOCUS
The cond i t ion of a tel escope be ing focused on an obj ect at an
inf inite distance ( extreme ly far away ) from the telescope.
This condit ion is most eas i l y and accurate l y achi eved by
autocoll imation using a mirror.
LEVEL
An instrument used for sighting el evations .
Differs from a
trans i t in that the tel escope of a l eve l cannot be plunged.
LEVELING S CREWS
Screws
in
the
base
of
an
optical
tooling
or
surveying
instrument, used to t i l t the instrument so that its vert ical
axis is trul y vert ica l w ith respect to the earth ' s center o f
grav ity o r a re ference p l ane.
Also referred t o a s foot
screws.
A - 6
I,IN:e. SCOPl'�
Term commonly used to ldent i fy ;In a l ignment teJ. e scope with no
m i c rometers .
M. T . C .
MultJ.ple -target co l l imator .
As used in this manua l , re fers to
the Brunson model 2 7 2 co l l imator mounted in the center of the
target post on the model 2 7 0 -BN col l imat ion test stand .
OBJECT IVE LENS
The OV frontlG lens of a telescope :
the l ight-gathering l ens a't
the end o f the tel escope p o inting toward the obj ect be ing
sighted .
OPT I CAL MICROMETER
An attachment on the end of the tel escope barrel of an opt ical
tool i ng or surveying instrument , used to displace the l i ne-o f ­
A graduated
s ight para l l e l to its z ero o r center pos i t ion .
s c a l e measures this d isplacement in l i near units of mea sure .
OPTICAL PLUMMET (IN A THEODO LITE)
An auxi l i ary tel escope whose l i ne-o f-s ight is concent r i c to
the instrument ' s verti cal axis , used for s i ght ing below the
inst rument and cente r ing it over a re fe rence po int .
OPTICAL PLUMMET (IN THE MODEL 2 7Q-BN TEST STAND)
A col l imator and mechanical pos it ioning a s sembly l ocated i n
the bottom of the Test I nstrument ' s mounting post o n the model
2 7 0 - BN test stand .
It i s used for adj ustment of opt i c a l
plummets in theodo l ites , and f o r centering the l i ne-of-s ight
over the vert ica l axis in opt ical too l i ng trans its with hol l ow
vert i c a l axis .
PLUNGE
The act o f mov ing the telescope
through an ang l e of 1 8 00 or more .
the hori zont a l axi s . )
of a trans i t end over end
( Rotat ing the barre l about
PRECI SION SIGHT LEVEL
A l ev e l with capab i l it i es for t ransit ing the t e l e s cope up o r
down by sma l l amounts for prec ise l evel ing and e l evat ion
read ings .
REGI STER
"Al igned with . "
The ret icle o f an inst rument is said to be
" i n reg i ster li with a target if it is prec i sely c entered on ; or
a l igned with , that ta rget .
A
-
7
RETI.QI&
The " cr:oss-ha irOi or ,ocro�s-wire�i l i nes ( f 1 1 :::1 7.:' 1; ) in an opt ical
instrument telescope .
§!PIDER
That part o f the base o f an instrument having four l evel ing
screws ,
into whi ch those l evel ing screws are threaded .
Di f fers from 81 tr ib rach OQ on three-screw l eve l ing bases .
STANDARD
On a trans it-type instrument , that framework wh ich holds the
telescope and hor i z onta l axis above the vert ical ax is .
STRI DE LEVEL
A l evel vial mounted on metal "veesol for use on the outer
surface of an a l ignment tel escope or col l imator barre l .
VERTI CAL TANGENT CLAMP
On a trans it-type instrument , the cl amp
telescope mot i on about the horiz onta l axis .
which
contro l s
VERTICAL TANGENT SCREW
S l ow moti on or f ine adj ustment screw contro l l ing up-and-down
t i l t of an instrument ' s tel escope .
THEODOLITE
A trans i t w ith graduated circles about its mechanical axes for
the measurement of hor i z ontal and vert ical angles .
TRANSIT (noun)
An opt ical too l i ng or surveying instrument with hor i z onta l and
vert ical axes enabl ing the telescope to be plunged in a
vertical p l ane , as wel l as rotated in a hor i z onta l pl ane .
TRANS I T ( ve rb)
To t i lt the tel escope of a trans it or precis i on s ight l evel up
or down .
TRI BRACH
The base o f any opt ical tool ing or surveying instrument having
three l evel ing screws .
VERTICAL AXIS
The mechanical ax is about wh ich an instrument may be rotated
to sweep a hor i z ontal pl ane .
Also c al l ed vert i ca l spi ndl e .
A - 8
Y.�RTICAL RE'I' I CLE LINE
The l i ne or lines o f the ret i c l e which l i e vert. ica l l y wh en t.he
instrument is mounted upright .
ULTRADEX
Trademark of the AA Gauge Company to descr ibe an index i ng
table
capable
of
turning
ang les
to
an accuracy of 1/ 4
arcsecond .
Used in the mount ing post of the model 2 7 0 -BN te s t
stand .
A
-
9
1'OPLS REQUIRED FOR. ,.INSTR��NT ADJUSl'MEN'r
1. .
?
0
Scr ewd r ive r s :
s crewdrivers ,
severa l
s izes
of
s tandard
f l a t - bl a de
rang ing from 1/ 8 inch to 3/8 inch in width .
Hammers :
one soft hammer ( p lastic , rubbe r , OI:' rawhi de ) , about
8 - 1 6 o Z o v and one small bra s s o r steel hammer , about 1 - 2
oz .
3.
A l l en wrenches :
compl ete range o f American s i ze s from . 0 2 8
inch to 3 / 8 inch .
For use on European opt i ca l - reading
theodol i tes , met ric s i z es from 1 . 5 mIn . to abou·t 5 or 6 mm .
4.
Sma l l bras s dr i ft :
su itab l e s i z e for appl y i ng to heads
ret i c l e adj ust ing screws for ret i c l e ori entat ion .
50
Adj ust i ng p i n s :
Brunson
equiva lent .
Severa l do z en .
6.
part
nos .
End wrenches :
Ame rican s i z e s from
Metr i c s i ze s from 4 mm . to 1 0 rom .
A - 10
5086
1/ 4
and
i nch
to
7054 0 ,
1/ 2
of
or
i nch .
I LLUSTRATIONS
A
-
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RJ£ Tl C U .
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1',*,1ilI NO.
A LIGNMENT SCOPE - PARTS U ST
O � SClUPTION
21.33
�(rl!""', roc u s in g
2430
Ring,
3
"yepiece
MounT_
lock
ring
len,
soyepiece
U27
S pac er, oye lens
243 2
l�ns, eye
6
2426
�ing, aye lens ,etiner
7
2425
Diophrcgm,
o
2429
Nut, eyepiece focusing
17
261 1
A d a p t or,
eyepiece
11
26 1 0
Mount, reflector
12
2635
Spring, oliffuser on d lens
3.
2636
Diffuser, l i g h t
14
2885
l e n " . condenser
2637
17
2623
13
2424
&
diffuser
lons
Spacer, (ondenser lens
Reflector, l ig h l
Dia p n r ag m . erector
mount
19
2628
reticle
Ring,
&
erector
lens mount r e t a i ner
20
2630·01
light
a sse m bly
housing
w/ 2672 Iransfa r m e,
21
2431
lens, e r ector
22
2423
Spacer, t:rector
23
26 1 4
Screw, erector lenl
, e l ic l "
adjuste ,
24
26 1 6
Mount.
ereclor
25
2422
Ring, erec tor lenl
lens
2769·01
26
2769·02
241 �
r.llection
relleclion
<\0
2640
To,ge., a u t o
41
2605
R i ng.
a u to
2604
reil"tfion
te'oint!(
obi�ctiy�
Ring,
43
2629
<14
2681
R i ng, o b je ct i v e end
(.moll)
Ring,
obj ec ti v e end
Light
housing
1 7 1 9·G3
46
5293
Len"
47
1718
Spoce"
<18
1 692
R i n g,
49
1 69 1
Mount, eye ien.
eye
len.
eyepiece
so
1 695
S po c e r
1 693
Ring, lens retainer
52
277 2 · G I
A d a p lo"
53
1 698
Diffuser, lig ht
54
27 1 9
Mount, light diffuse,
55
2720
lig"' hauling
Ri ng, lighl diffuser
retainer
272\
Ring,
di ff use ,
light
mount retainer
57
2430
58
2455·01
Rtng, eyepi(!ce ff)CU ling
Eyepiece
foculing
.. fleeto,
60
Ring, foc usi ng lens
61
5294
F ill""
62
5295
Refleclor, cleo,
p,ojection
Lens,
focusing
Pinion ass.. mbly
slide
assen,bly
Rock, foc u si ng .lid"
81 B a rr e l
2632·01
3 <1
2406
Lens, objective
35
1602
Mount,
Model
objective
nul
B.
assembly
63
5296
Reflector,
5297
RefleclO',
65
1 723·01
l!.
attachment
Refleelo"
full mirra'
pa r t ia l mirra,
mou nt
&
,efi<!ct o, assembly
66
1716
Screw, spirol focu.ing
67
261 3
Screw,
objective
lens
lo'gel odju,Ie'
68
len,
index
eyepiece
g,oeo
64
focus)
33
f ocusing
51
(Fila,·BiFilar)
(sno,t
as s e mbly
45
K nob,
Focusing
&
mount
target mounf retainer
A dopto"
Mount, focusing lens
2726
oulo
lo'ge.
27 1 6
24 1 3
32
Mounl,
27 1 5
assembly
2<1 1 5
261 5·0 1
2603
o bj ec t ive mount 11
Ring,
targat mount retain(}(
59
Reticle
l'.
lens
Ions mount assembly
29
31
39
Reticle assembly
29
505 1 ·02
2604
56
retainer
30
38
lens
(Projeclion)
27
objE:trivp,
Sc rew,
.orgot odjulter
S­
retolner
26
261 3
(Io,ge)
13
16
37
dilluler
tens.ion
Relo,n."
refainer
42
S p ace r,
lenl
DESC RwnON
fl i n g , obj�cti,o l e n l
'o'g�t
2886
2638
2606
.tro i g h t
eyepiece
15
PART NO.
36
focu,ing
5
10
INDEX
261 4
Se,e .... , e,eclo, len,
retic l e
adjusle,
8.
&
BtiUNSON Moon NO. 83 AUGNMENT SCOPE PARTS LIST
INDEX
PART NO,
I NOEl(
DESCR IPTION
Pf.RT NO,
I
27 8 3
S lOp ,
f oc u .i ng .Iid"
47
U,3 4
2
2(\45
Cover, focu.ing I&n.
48
2644
49
2 06 1 · G l
3
2638
odju,'er "row
d if fu.e,
Retaln.r,
'"
4
2636
Dillu ... "
.5
2834
Mount, condensor '"
6
263 1 0 1
7
a
9
2637
Spoce',
1 260
l e ns. c o n d e n ser
2635
Spring,
10
2637
Spocer,
II
2623
Rell.clor, light
12
2784
r"/I,,ct o r
&
le(ll
diffuse,
diffu.er 8.
I"n.
diffu.e,
IS
2433
16
2432
17
2428
M o u nt, eye lens
2 4 26
2427
Mounl, objoc1ivc
Ring,
f ocu si n g
10
2430
Ring.
19
2425
Diophro g m,
20
2450· 0 2
l e n s &.
21
2660
Nuf. eyepiece focusing
22
266 1
Ada p tor, .'ra i g h t
eyepiece
23
24
266S
O r v m.
2662
Beering,
25
2777
B u s h i ng ,
26
504 1
27
2846
Gear, pinion
S cr e w , f o c u s i n g
r et o i n e r
28
2669
D i a p hrag m, .r.clor
eyepiece
e y e piece anembly
' No . 8 3 )
f o c u si n g
c a m shaf t
p i n io n
dr um
mount
29
24 22
33
2658
H ov , i nij.
54
2860· 0 1
Micr o m p. l er
55
2655
Mount,
56
2059· G I
Micrometer
57
25 20
O l o c k , micrometer
58
2 8 40
R i ng,
micrometer
59
2659
microme ter h o u s i n g
Ring,
cap
60
2858·01
61
2640
T orge',
62
2839
M o u nt,
o u to
reflec1ion
o u lO
reflecfion
'o'gel
63
2843
R i ng , t o r g e ! r e t o i n e r
64
2841
R i ng .
target :n O u n !
retainer
65
2856
>l i n g , object". end ( 8 3 )
66
2850
S t o p . horizonlo(
67
2049
S t o p , i n ner tolerance
68
2652
S l e eve, rOCK t h rust g u i de
2833
S p r ing, rock roller
70
1650
Guide,
71
26S 1
Ro l l er,
ten"ion
rack t h r u .t r o l l e r
rock t h r u .1
72
277 6
F o l l ower, wm
73
2677
Stop, .to tionary
olSembly
Zero
.top
Disc,
clomp
76
2666
D r u m , k n urled
77
2 0 35
Com.
2866
Plate, focus index
Sp a ce r, er2cto, lens
control
32
2047
Housing,
33
2431
te-ns, e r ecto r
34
2662
Beartng, c a m sh a ft
2649
Mount, e l e c t o r lens
2865·01
Reticle
as sem b l y
37
2864·01
Reticle
a.
erector
lens
a u e m b ly
283 2 · 0 1
Focu.ing
rock
', h r u�t
assembly
.. I
2848
Pin, lock I)nchor
28S4
Ring,
42
2489
l e n s , /oc u . i ng
413
2670
Mou nr,
44
2863 · 0 1
Focusing
45
2862·02
46
2779·01
focusing
focusing lens
a.
F o c u .ing .Iide assembly
auembly
79
2657
Sholt, cam
80
2656
Plole, index
91
266�
Drum, g ra d ua ted
82
26 5 3
Spri ng,
83
2051
Stop, verticol to l ero nc e
84
2944
link
Screw.
drum
brake
micrometer
drum
relainer
85
26 1 3
86
26 1 3
87
2826
ao
2630· G l
Mounl
auembly
Micrometer
Cam, micrometer
(Ie/I side)
lens
retain�r
lens
microme1er
2836
70
3 .5
39
micromtter
(right .ide)
36
reticle
toleronce
69
2668· G l
2423
a­
A u t o r e f leclion forge1
m o u n t a ss e m b l y
2663
30
block
refainer
75
Ring,
block
housing
74
2643
m o u nt
block
microrr.,'er
R i n g , erector len1
31
40
m i c rOMlP t c r
retainer
36
lens
lens
obic(liy�
rgloin",
G u ide.
eyepiece
mo u n t
ouembly
I"ns &
m i c r o met e r link
R i n g . eye lenl r e t a i ne r
Spacer. eye Ie n!I.
Screw, f oc u si ng ring \ock
l e n s, eye
13
8.
l e ns
Objective
lens, obie(liv�
tension
14
thru.'
50
52
c o n d e ns e r "ucmbly
(8J)
telescope
objeclive
51
&
ro/l,,(lor
Lig"t,
Ring,
Cl uembly
lens
ligh!
DESC RIPTION
Bor r�I,
Screw, objeclive
l o r g e l adju.'er
Screw,
obj.ctive
leno
Ilo
len. 8.
lorgel a d j u .'e r
C over, reticle odiu�tjn9
,"crew
Light
wiNo.
h o u sing
2672
assembly
Iran.forme,
13'.
1��
__
__
__
__
__
___
__
__
������==��::::::::====::::======
2�OB
5079
lo,e-�
1 0 74
r 2 3 84
\
1&'2
''''
1 ' 2.4
HORIZONTAL AXI5
IIf�1
115 '1l
Iee e
18.,
--li"'£li;llill(:
AI" (HI
2 382
l�e 9
2459
I�M
164'
16 36
16<l6
le.�
111 04
2363
nez
IUS
23«;-GI
"-= 1 1 13-1
No. 7 1
7.33'
tt��SClt
23�
--- 500
3
Ifl,,·,
2329
.
2360
2367
!4U
ZQ2Z -.
Z �2'
-�
'''
""" '
..
.�
o-aoXI/OlO<
_ i!1I"'IlCH seR
2 3 72
H ! 64
nlll
Z3� 7
1 3 S6-GI
2363
2362
Z3SQ
U6�
2 !.4 �
23Je
2337
2336
" 56
233)-GI
No. 75
-===�::::����--�--l,.
_.
I I ' ''''
------::::
_
____
2335
3-32 XII! Q II.
2 352
s00 3
1113-1
lICk SCR
G Ul
N@. 76
MODU 75 O�YICAL Titt-NSli .l YUAi(i:.
MOOn 76 TELESCOPIC ·nt�,NS!r $�'UAR�
AN� Moon 71 JIG r�ANsrr
3 '7 ;
101«
I 098-GI
1 1 1 3-1
1 1 1 3- 1
1 1 1 3- 1
1 1 1 3- 1
I3H
1 354
1 356- 1 ; 1
1 633
1 036
I on
, cell
IOU
1 545
1 6 �6
1 6 �9
1651
1652
1654
1655
1 5 60
1664
1�68
1 66 9
1 1 29
1 73 1
17l�
1 135
1 736
1 138
11n
1741-1
1148
1 1C9-Gl
2326
2328
2332
2333-Gl
2335
233.
213T
2328
2345
2348-GI
2341
2355
2357
U58
%359
%359-1
%360
2UI
2382
2383
23&8
2361
2368
2312
2317
2378
2379
2382
2383
2384
2385
2388
2404
2405
2 1 f16
2UO
2421
2422
1423
2424
2425
2426
2421
2430
2�3 1
2432
2f33
2'36
2439
2440
2 143-Gl
2H4
2 4 5 I -GI
2 4 52
2 4 5.
2 l 55-GI
2456
n � . bull. t y c '¥ i M mount
Vitll. t�liJsu'f)p� leV02I. r�.,:o,siODl
Lrvpl. tl'let.fOpt'. v i l:ll t!l C't;.3� '109�",bl ,..
Solis. 9IQ�', 5 / l 2 t 3ft of ) I} l . vertic-ill
. . i. (h(.lIow 8k);n11.1
Ball•• Quel. ; / 3 2 I,.• t of 4 1 ) . PI,,;;, v . .tical t ll i3
Ballo • • te.1. � · � 2 1 9 . 1 of � ; ) . a"o .ide
horizo n t a l u;. Mod., 7 5
B e l l• • It"!. ) / 3 2 ( • • 1 a t 25 ) . on • • Id�
h"rl,onlal Q x i s ModCiI i t
Mirror. (iret 9urtnt� , "u l l rdlert i n a )
t a p . nbJfcth'e
S t r e w , neltt adj u .. l i n g
tele!\copc
na ce-. outer aKin bEG,tntl
.:I ... . •
(')amp.
Nut. brake nut lock
Cep. 8 1 1. ond
Standard
Nut. in ner asia raee! r.tnin"u
Nut. Mlandllrd toe .. in
Flange. :'>lIrro.
Mou"t. m i r ror
COlfer, horizontal a:r.ia ,"ifror
Buahinlr. axiD adjuster
Screw, tel".cope c l a m p
Slide. tocuainll ( f ini.hod)
Serew. teJescope brake retainer
N ut. broke
Sprintr. teieseope brake
Spider
Soc�.'• • pindle Ihollow spindle)
Solndl •• ho ll o w nr li. al
Rlnlf. half ball b.arinw lock
Ri ftW. halt ball lo(k
Cap• • pindl.
B•• rlnll'. halt �all
Socko!. conlor half ball
PIale, bot tom
Bull. eyO. vi.1 & (0" a •••mbl,.
Plat •• bottom
Sock.l• • tnt • • half ball (f"etor,. fltl.d)
B . . rinw. half ball and apider
St ..... 1.vollnlf ... embl,.
BUlhintt. levelin8' ,cr�w
Shield. lowor. :ovlllnw ... . w
ShIeld. IIpper. lu.llng ""r.w
Spi d.r
Clamp. 10 ... ..
Screw. lo"�r 'Gngtnt. BBnmbl,.
tansent .erew
Scr. .. . bull. t10 vl.1 mOllnt
Screw • .tftndard bal. to int.rmedIAI.
plat.
Sere ... . Intermedlol. plolo to .tandard
Standard
Standard. h oll o w Iplndle
Sc ro ... . . tandard to p
Bu.hlnlf. niB "djusl.r
Ser .... asia adjllDt�r
Nllt. lock. asi. ,,"Juet.r
Clamp. tel.lICope
SCr ... . tel ..cnpe elamp
Screw. lower damp
Race, outer I.\sl. b.aring
Nut. brake nat loch
Bu.htng.
Nyt, rac� retaln.r
Nut, standard toe·in
wi n do w Dnd ",brow relalner
Windo ... . ul& ( 30% refle.tin!!') IClamp
.Ida)
9c .... . wi ndow edjllater
Cover, nange
Adaptor. al.Blllht 0,..,,1 ...
Mount. obje.tlvq
Rlnll. obJectiye lock
Len•. Objectl • •
Slide focullnw (flnlnhod)
Mount, ereeting lena
Rin., erector lena retainer
Spacer. erector Ie no
Diaphra«m. erector mount
DlaphrBllm • •y.pl..,e
Ring• • ,. e lenD retaln.r
Spacer, .ye 1'''11
Ring, eyepiece focusing
Lens. erector
Lens, rye
Screw, lode. (ocuBin[f ring
Plate. Intermediate
Flange. window
Clip.
Mount. window
Screw. telescop.
tllngrnt BS-"embly
Window. axis (low rtflo<lintr) ( Loft
.ido)
Vial. bulla rye snd mount
Sprtnl'. ball!! .ye vial mount
Collet. reticle and tr�etor lens
Ey�piece t o cu B i n B' rin« and lena mCU1\t
a8sembb
Ser • .,. reticlE! t1.nd l�nB mount adju!'t.r
asoembly
2 1 69
H61·Gf
lU·6
US7
1478
l47g
%482
�'D3
24 04
%CB5
2486
2'81
2UI
2'92
2493
24�4
2496
2'91
2498
��'r�"', dto r"tolntt
Ft'ltu,tna lena And m01Attt .Ne ...-�bly
1'1111. b,.It.
;lprlnlJ. lal,.".olle br&k.
Mount. �r.ct�r Ilfln
S paeClr, l<ino
Nut. I,..DI ... locI!
Mounl. objective
01. ph rllii m. ouclor
Flanwo. o!>jocU ••
FIDnae, na'o tYIl?lec�
COP • •
Cover. ."j• •tlve tlan!lc
Rina. obj�tiv. I�n. f�t8h"r
Spacer. .)'I'l teni)
Mir ror. ( Riehl angl. ,y.l>l .. o-(r�.o
ICOp.)
KinB'. rfaht Ilft�l� e)'frJfCle� r2'tnin(!f
llarrel. croM ..OPo. rlllilt �RIJI. e,.opl•••
MOllnt. r l ll h t 0"111. o),opl... <FO... ..op.
m ir r or
,.pl.ct
Beorinfl. rlllht DnDl• • ,.�Iqe. CtaOb .<.,pe
CUp, ",'rror reUllJlQr
9prln!!. rlll'ht an"l• • )',,\>10•• •rccs ••()P�
C ov er, r'g-hi auglo eYipl"ee enlj
R.tainer. leno
enlllC2 GyftDleefJ crOle scope
2499
2536
2538
2539
2540
2541
�;i!�!�rhrht
2543
25H-GI
2545
2546-Gl
2548-GI
2549
261 0
Nut. nlht AnI' • • y."I�. loc/(
Rlwht an "I. e,.opl ... hOlloinll' eo.ombl,.
R.tI •• tor. IIwht
Crols "eliDe .rector lena sllIGmbl,.
Barrl'l, .ha'l'llt crolo scope
Screw. obJe.tl .. adju.hr
eyepiece cross scope
2623
2630-GI
2635
2636
2637
263R
28U
2820
:82 1
2823
2885
2888
28B8-CI
Uti-I
5003
5004
600'-1
5010
50 1 8
5022
5029-GI
5030
50 5 1 -G2
S079
5135
5 1 58
5292
5293
::�t��:�ratral.ht
R.n ••to r. IIWM
Lltrht ho ... law .. . .
Sprlntr. dllfu ... and 'ona I.nolon
D l f fu.or. IItrht
Spacer. conden.er lenll
R.laln.r. dllfu ... .II< I.no
"'bl,.
Rln •• eree to r lin. retain.r
Rin .. . eye lenll ntlltner
Dlaphr8wm• •,..pl ....
Mount, eyepiece len.
Lenll. conden.er
Spa ••r. I.n. & dl f ll.Mr
C.ON Beope r.tlcI. "•• ombl,.
Plato. Interm.dlat.
... lock. Iplndl.
Cap. Ileal
• • I.... p
Rln
Call
Pluntrer. sprlnll
Sprlntr. t."trent
p.nion retain"r
R.tlclo a ••o mb ly (s ln"l• •ro•• )
Sh.... . I.. . nnw .cr."
Pinion ... .. mbly
N Il I .. t.l"""op. vial adjuotor
Sere ... Splndlo
Rlnw. k.oper
L.na. ..""to.
Len_, e,a
Scrrw.
A
I
2. , l
'l . ,1
4 8 1 6-
5 12
•
dW :ft.
" :..<�
j=t?�
- ��" .� " :
_
�
GI---If:
�
800; ---
I
- -
I
.. ..
.
•
<
' .
..
_ _
' ,/
�
.�
'. .
' '/
'
;- -;.
;
"
I
.
__
____
--
::::_ GI
.---- 4 3 l C
�. '" B I 7
A---'
H--t
:-
- "
�.
�
''\�
� . :-
MAG N I F I CAT I ON:
30 X
FIELD Of V I E W : 1 . 1 2 °
EFF ECTIVE
AT I N F I N I T Y
APERATURE : 1 . 3 4 I N C H E S
RESOLUTION:
3 . 9 SE C O N DS
5 0 Q4
-- 24 . 3
545
V I E W- A A
L E V EliNG
AC CURACY ·
I S ECOND
1
5
6
1
6
31
30
9
10
11
12
13
14
15
16
17
23
•
AZr. NO.
OESClUPTlOfl!
PART NO.
��--I
�-- 1 8
20
21
22
MODEL II 190 OPTICAL MICROMETER
CoITY. kEQ.
1
2
Adjuct1n, Cap Sc:�w
Adju.tto, Scrfiw tvnM<!1r
2550
3
Pillion Screw
2513
1
2 533
3
�
5
a
'f
a
0
{
Drum Cl!l.mp Screw
Knurled Dnm
Graduated Drum ( Model 191) I
GrsdllQt'3d Drum ( Model 1 90- 50 )
IndelC Ollie
Brake Spring
,Stationary Stop
5995
2503
'2504- 1
2504 - 2
2505
2525
25 1 "
10
Clamp Disc
2506
11
Pinion
Suppr,rt Screw
251 )
2 r.27
�/If)Qrt Drum
Z50� - )
AnU- Backlssh Spring
SprlnS Retainer
Retainer Screw
Z 5 � !'
25:lO
�5:t '1
1 '1
U
10
'
DESCRIPTIOl�
REF. riO.
PART NO.
'lTY. R!JQ.
17
10
19
Mllin Body TII!:le
Cillml' Screw
Window A88erilbly
20
Ball BenrinlJ
1 1 1 3-3
'I
21
22
Window Serew
Window Serew Nut
3
2
23
GlaBs Retainer
Cover Glass
Crank Pin
2509
2510
2523
3523
2501-1
n3B
Specify Model Number
1
1
who" ord�r1ng
1
26
Sector
27
Sector Beann«
2515
!
1
1
1
20
29
Sector Bearing Nut
3516
1
351 1
30
Sector Retainltr Nut
Index Disc Seraw
2533
31
Pinion BeBrlng
3513
3 :l
Movable Stop
2519
24
25
2508
2514
USFJFUL CONVE RSION
Se�<f)) nds of arc
1 Sec .
2 �c .
3 Sec .
20 Ft.
30 f \ .
4 0 Ft .
50 ft .
100 ft .
. 0006
.001 2
.0024
.001 B
.0024
0036
. 0 054
.003 0
.0060
.0090
.01 2 0
.01 50
. 0 300
. 04 5 0
. 060 0
. 0060
. 01 20
0036
.0048
.0072
.0096
.0120
.0240
. 0360
. 0 4 80
.0600
.0720
1 4 40
. 0024
.0030
0 060
.0090
. 0 1 20
. 0 1 50
. 0 1 S0
. 0360
.
1 5 ""'"
20 Sec .
25 Sec .
30 Sec.
60 Sec .
terms of thousandths of an i nch
1 0 Ft.
. 001 2
. 001 8
4 Sec .
5 Sec .
1 0 Sec .
c
In
TABLES
.0048
.0072
.00 6 0
.0090
.01 20
.01 80
.0 2 7 0
.01 80
.0240
.0300
.0360
.04 50
.0540
.0360
.072 0
. 1 080
.01 80
.07 50
.0240
.03 00
.0600
. 090 0
. 1 200
. 1 500
.0900
. 1 800
.1 8 0 0
.
. 3600
Angles to linear measurement
Angl!
. 00 0048
. 0000 9 7
. 000 1 4 5
20 . ,
30
. 0 00046
. 000242
.000485
.000970
. 001 4 54
. 002909
. 00000 5
. 000024
5 "
1 0 ..
"
l M ln.
Per Foot
. 000058
Per 1 0 Inches
Per I nc h
1 Sec .
. 000291
. 000291
.000582
.001 1 63
. 001 745
. 003491
Linear measurement to angles
l i near
. 0 0000 1 "
. 0000 25"
. 00005"
. 0001"
. DOl "
. 00 5"
Per Inc�
0.206 Sec.
5.1 5 7
1 0.3
20.6
3 M i n 26.
1 7 M i n 1 1.
"
Per_l 0 I n�hes
0 . 0 2 1 Sec
.
0.51 6 "
1 .03
2.06
20. 6
1 M l n 4 3.
Per Foo t
O.0 1 7 Sec
0.430 "
0. 8 6
.
1.7 1 .
1 7. 2
I I
"
"
I '
l M i n 26.
"