calipers, dividers and trammels

J.W. DONCHIN CO. 4841-43 W. Chicago Ave. • Chicago, IL 60651-3224
Ph: 773-261-2182 • Fax: 773-261-2867 • [email protected] • www.jwdonchin,com
CALIPERS, DIVIDERS AND TRAMMELS
Contents
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Description
Range
CALIPERS, DIVIDERS AND TRAMMELS
Toolmakers’ Spring-Type Calipers and Dividers with round legs and solid nut
Nos. 274, 275, 277 Series
3, 6 (75, 150mm)
“Fay” Spring-Type Calipers and Dividers with heavy square legs and quickspring or
solid nut
Nos. 74, 75, 77 Series
6 (150mm)
“Yankee” Spring-Type Calipers and Dividers with flat legs and quick-spring or solid nut
Nos. 73, 79, 83 Series
4, 6, 8, 12 (100, 150, 200, 300mm)
“Yankee” Spring-Type Hermaphrodite Calipers with quick-spring or solid nut
No. 43 Series
6 (150mm)
Thread Calipers
Nos. 179 and 184
6 (150mm)
Firm-Joint Hermaphrodite Calipers
No. 243
6 (150mm)
Hermaphrodite Calipers
Firm-Joint
No. 563
6 (150mm)
Lock-Joint with fine-adjustment
No. 42 Series
6, 8 (150, 200mm)
Improved Firm-Joint Calipers
No. 26 Series (Outside)
6-36 (150-900mm)
No. 27 Series (Inside)
6-24 (150-600mm)
Lock-Joint Calipers with fine-adjustment
No. 38 Series (Outside)
6-24 (150-600mm)
No. 39 Series (Inside)
6-24 (150-600mm)
Lock-Joint Transfer Type Calipers with fine-adjustment
No. 36 Series (Outside)
6-24 (150-600mm)
No. 37 Series (Inside)
6-24 (150-600mm)
Divider Ball Points with holder
No. 88 Series
4, 7 1/2 (100, 188mm)
Improved Trammel Heads with divider points, pencil socket
No. 50 Series
Trammel Heads, Divider Points, Attachments
No. 59 Series
Steel Beam Trammels and Attachments
No. C251 Series
10 1/2 - 20 (260 - 500mm) Beams
CALIPERS, DIVIDERS
AND TRAMMELS
This section concerns so-called “skill”
tools. A pair of calipers (in common
terms, one caliper) is one of the oldest
types of comparison measuring tools.
They depend on “feel” to measure a
part, transfer the dimension to a
precision rule, micrometer or slide
caliper, and get a good reading. This
involves skill and experience. If used
properly, calipers can measure to at least
.004⬙ or 0.01mm.
Measuring with a caliper requires as
light a touch as possible because most
comparisons are made with rules,
where the caliper is laid against the
graduations, without the contacts
touching anything.
Calipers and dividers are offered in
two general designs: spring-type and
firm-joint. Spring-type calipers are
tensioned against the screw adjustment,
while the firm-joint is held by friction.
Caliper sizes refer to the distance from
the fulcrum to the end of the leg. The
measuring capability of spring-type
calipers and dividers is approximately
the same as the size. The measuring
capability of firm-joint and lock-joint
calipers is approximately one-third more
than the size.
Caliper points are not hardened because
they only compare measurements. The
contact points can be easily shaped in
whatever manner desired. All divider
points however, are hardened.
Dividers and trammels are usually set to
rule graduations and can be set more
accurately than calipers.
CALIPERS, DIVIDERS
AND TRAMMELS
Toolmakers’ Spring-Type
Calipers and Dividers
with round legs and
solid nut
Nos. 274, 275, 277 Series
3, 6⬙ (75, 150mm)
Starrett Toolmakers’ Calipers and Dividers
are the finest tools of their type. Designed for
toolmakers and all good mechanics who
require finer adjustment and better balance
so a more sensitive “feel” can be obtained.
Precision made to rigid Starrett standards
throughout.
The fulcrum stud is hardened and the
bearing surfaces of the legs are large enough
to prevent any side deflection. The bow
spring is strong and flexible, and the
adjustment is centrally located in the legs
to assure smooth action.
Left to right:
No. 274-6 Inside
Caliper, No. 275-6,
Outside Caliper and
No. 277-6 Divider.
Size and
Approx. Capacity
Inch mm
3⬙
75mm
6⬙
150mm
Inside Calipers
Catalog No. EDP No.
274-3
51301
274-6
51303
Outside Calipers
Catalog No. EDP No.
275-3
51305
275-6
51307
Dividers
Catalog No. EDP No.
277-3
51309
277-6
51311
“Fay” Spring-Type Calipers
and Dividers with heavy
square legs and quickspring or solid nut
Nos. 74, 75, 77 Series
6⬙ (150mm)
Starrett “Fay” Calipers and Dividers feature
exceptionally rugged construction. The legs
are made from heavy square stock,
machined to a smooth taper. The fulcrum
stud is hardened and has a large bearing
surface to prevent side deflection of the
legs. The bow spring is both strong and
flexible, and the adjustment screw is
centrally located in the legs to assure
smooth action. Furnished in either spring
nut or solid nut models.
The Starrett quick-adjusting automaticclosing spring nut is designed for making
quick, positive adjustments. The threads of
the nut firmly engage the screw at the
slightest pressure from the leg. When the
pressure is withdrawn, the nut
automatically releases itself, sliding freely
over the screw.
Left to right: No. 74B-6
Inside Caliper, No. 75B-6
Outside Caliper, No. 77B-6
Divider
Below: Quick-adjusting
spring nut.
Inside Calipers
Size and Approx. Capacity
Inch
mm
6⬙
150mm
EDP No.
50349
Quick-Spring Nut
Catalog No. EDP No.
74B-6
50348
150mm
75A-6
50355
75B-6
50354
150mm
77A-6
50361
77B-6
50360
Outside Calipers
6⬙
Dividers
6⬙
358
Solid Nut
Catalog No.
74A-6
CALIPERS, DIVIDERS
AND TRAMMELS
“Yankee” Spring-Type
Calipers and Dividers
with flat legs and
quick-spring or solid nut
Nos. 73, 79, 83 Series
4, 6, 8, 12⬙ (100, 150, 200, 300mm)
Starrett “Yankee” Calipers and Dividers are
made from a high-grade steel and wellfinished. The legs are made of flat stock
and are very durable. The fulcrum stud is
hardened and has a smooth bearing
surface. The bow spring, although flexible,
is exceedingly strong to assure reliability.
All sizes are available with either spring nut
or solid nut. The Starrett quick-adjusting
automatic-closing spring nut is designed
for making fast, positive adjustments. The
threads of the nut firmly engage the screw
at the slightest pressure from the leg. When
the pressure is withdrawn, the nut
automatically releases itself, sliding freely
over the screw. This feature saves time
in opening and closing.
Left to right: No. 73B-6 Inside Caliper, No. 79A-6 Outside Caliper and No. 83A-6 Divider.
Inside Calipers
Quick-adjusting
spring nut
makes fast,
accurate
settings.
Size and Approx. Capacity
Inch
mm
4⬙
100mm
6⬙
150mm
8⬙
200mm
12⬙
300mm
Solid Nut
Catalog No.
73A-4
73A-6
73A-8
73A-12
EDP No.
50334
50336
50338
50342
Quick-Spring Nut
Catalog No. EDP No.
73B-4
50335
73B-6
50337
73B-8
50339
73B-12
50343
100mm
150mm
200mm
300mm
79A-4
79A-6
79A-8
79A-12
50364
50366
50368
50372
79B-4
79B-6
79B-8
79B-12
50365
50367
50369
50373
100mm
150mm
200mm
300mm
83A-4
83A-6
83A-8
83A-12
50376
50378
50380
50384
83B-4
83B-6
83B-8
83B-12
50377
50379
50381
50385
Outside Calipers
4⬙
6⬙
8⬙
12⬙
Dividers
4⬙
6⬙
8⬙
12⬙
359
CALIPERS, DIVIDERS
AND TRAMMELS
“Yankee” Spring-Type
Hermaphrodite Calipers
with quick-spring or
solid nut
No. 43 Series 6⬙ (150mm)
These calipers have the same overall
design and finish features as our
“Yankee” calipers.
One leg is bowed for clearance and capacity.
The fine-adjustment screw allows for close
setting accuracy. This tool will scribe lines
parallel to outside edges easily and consistently.
Quick-adjusting
spring nut
makes fast,
accurate
settings.
No. 43A-6 with solid nut.
Size and Approx. Capacity
Inch
mm
6⬙
150mm
Solid Nut
Catalog No.
43A-6
EDP No.
66575
Quick-Spring Nut
Catalog No.
EDP No.
43B-6
66576
Thread Calipers
Nos. 179 and 184
6⬙ (150mm)
Starrett Thread Calipers are designed for
measuring screw threads. The points of the
No. 179 are tapered for measuring outside
threads, and the points of No. 184 are
shaped for inside threads. These calipers
are made from a high-grade steel and wellfinished. The fulcrum stud is hardened and
has a smooth bearing surface. The bow
spring, although flexible, is exceedingly
strong to assure reliability. Furnished with
solid nut only.
Left, Outside Thread Caliper No. 179-6; right, Inside Thread Caliper No. 184-6.
Size and Approx. Capacity
Inch
mm
6⬙
150mm
360
Inside Caliper
Catalog No. EDP No.
184-6
50674
Outside Caliper
Catalog No.
EDP No.
179-6
50669
CALIPERS, DIVIDERS
AND TRAMMELS
Firm-Joint
Hermaphrodite Calipers
Starrett Hermaphrodite Calipers are used in
layout work for locating and testing
centers, laying off distances from an edge,
etc. We offer a complete choice from which
machinists and toolmakers can select to
best suit their requirements. The rugged,
properly shaped legs are made of finely
finished, high-grade steel. Sizes listed are
the lengths of the legs. Actual measuring
capacity is approximately one-third greater
than the leg size.
No. 243
6⬙ (150mm)
This caliper features a round, adjustable
leg and an improved firm-joint, which
allows the joint to be adjusted at any
tension. The leg that holds the adjustable
point is offset.
* NOTE: Actual capacity is one-third greater
than the listed size.
Left, reverse side of No. 243-6;
right, front side.
Size*
Inch
6⬙
mm
150mm
Catalog No.
243-6
EDP No.
51143
Hermaphrodite Calipers
Firm-Joint
No. 563 6⬙ (150mm)
Lock-Joint with
fine-adjustment
No. 42 Series
6, 8⬙ (150, 200mm)
No. 563
This caliper has a round, adjustable point
held by a straight leg. An improved,
firm-joint feature permits the joint to be
adjusted at any desired tension.
Left, No. 563-6 FirmJoint. To the right, No.
42-6 front side (left)
and reverse side
(right).
No. 42 Series
These calipers have an adjustable point,
locking joint and fine-adjustment feature
for close measurements. After the legs
have been set to approximate size and the
joint locked, the final adjustment is made
by a few turns of the knurled adjusting nut.
No. 563 Firm-Joint
Size*
Inch
6⬙
mm
150mm
Catalog No.
563-6
EDP No.
52572
42-6
42-8
50263
50264
No. 42 Series Lock-Joint
* NOTE: Actual capacity is one-third greater than
the listed size.
6⬙
8⬙
150mm
200mm
361
CALIPERS, DIVIDERS
AND TRAMMELS
Improved Firm-Joint
Calipers
No. 26 Series (Outside)
6-36⬙ (150-900mm)
No. 27 Series
(Inside)
6-24⬙ (150-600mm)
Starrett Firm-Joint Calipers have an
improved joint designed so the tension can
be adjusted as desired. After adjustment
has been made, the tension will not change
with the opening and closing of the legs.
The legs are made from a high-grade steel,
are ruggedly constructed and are wellfinished.
The sizes listed are the lengths of the legs.
Their actual measuring capacity is about
one-third greater than the given size of the
legs; for example, the 36⬙ size will caliper
a 46⬙ diameter.
Left, No. 26-6 outside model; right, No. 27-6 inside model.
No. 26 Series Outside Calipers
Size*
Inch
6⬙
12⬙
18⬙
24⬙
36⬙
mm
150mm
300mm
450mm
600mm
900mm
No. 27 Series Inside Calipers
Size*
Catalog No.
26-6
26-12
26-18
26-24
26-36
EDP No.
50186
50189
50190
50191
50192
*NOTE: Actual capacity is one-third greater than the listed size.
362
Inch
6⬙
12⬙
18⬙
24⬙
mm
150mm
300mm
450mm
600mm
Catalog No.
27-6
27-12
27-18
27-24
EDP No.
50193
50196
50197
50198
CALIPERS, DIVIDERS
AND TRAMMELS
Lock-Joint Calipers
with fine-adjustment
No. 38 Series (Outside)
6-24⬙ (150-600mm)
No. 39 Series
(Inside)
6-24⬙ (150-600mm)
These calipers feature a joint that can be
quickly and firmly locked by a partial turn
of the large knurled disc. A spring washer
under the disc maintains proper tension
of the legs when the joint is unlocked.
These calipers are also provided with
an adjusting screw to permit fineadjustments for close measurements. After
the legs have been set to approximate size
and the joint locked, the final adjustment is
made by a few turns of the knurled
adjusting nut.
The legs are made of a high-grade steel
and well shaped. They are ruggedly
constructed and nicely finished.
The sizes listed are leg lengths. Their actual
measuring capacity is about one-third
greater than the given size of the legs.
Left, No. 38-6 outside model; right, No. 39-6 inside model.
No. 38 Series Outside Calipers
Size*
Inch
6⬙
12⬙
24⬙
mm
150mm
300mm
600mm
No. 39 Series Inside Calipers
Size*
Catalog No.
38-6
38-12
38-24
EDP No.
50253
50254
50256
Inch
6⬙
12⬙
24⬙
mm
150mm
300mm
600mm
Catalog No.
39-6
39-12
39-24
EDP No.
50257
50258
50260
*NOTE: Actual capacity is one-third greater than the listed size.
363
CALIPERS, DIVIDERS
AND TRAMMELS
Lock-Joint Transfer
Type Calipers with
fine-adjustment
No. 36 Series (Outside)
6-24⬙ (150-600mm)
No. 37 Series
(Inside)
6-24⬙ (150-600mm)
One of the handiest and most versatile
calipers ever made … Starrett Lock-Joint
Transfer Calipers have three key features…
a transfer arm, fine-adjustment screw, and
locking joint.
The transfer arm makes it possible to
transfer measurements from the inside of
chambered cavities, over flanges and other
places where it is necessary to move the
legs after they have been set to size.
Simply lock the joint, loosen the transfer
arm binding nut and swing the leg out or
in to clear the obstruction. Then move it
back against the transfer arm stop and
the exact size can then be transferred to
a rule or gage.
The adjusting screw permits close
adjustments for fine measurements. After
the legs have been set to approximate size
and the joint locked, the final adjustment is
made by a few turns of the knurled
adjusting nut. The joint can be quickly and
firmly locked by a partial turn of the large
knurled disc. A spring washer under the
disc maintains proper tension of the legs
when the joint is loosened.
Left, No. 36-6 outside model; right, No. 37-6 inside model.
The legs are made from a high-grade steel
and are well-shaped. They are ruggedly
constructed and nicely finished.
The sizes listed are the length of the legs.
Their actual measuring capacity is about
one-third greater than the size of the legs.
Measuring outside dimension.
No. 36 Series Outside Calipers
Size*
Inch
6⬙
12⬙
24⬙
mm
150mm
300mm
600mm
No. 37 Series Inside Calipers
Size*
Catalog No.
36-6
36-12
36-24
EDP No.
50245
50246
50248
*NOTE: Actual capacity is one-third greater than the listed size.
364
Checking inside groove.
Inch
6⬙
12⬙
24⬙
mm
150mm
300mm
600mm
Catalog No.
37-6
37-12
37-24
EDP No.
50249
50250
50252
CALIPERS, DIVIDERS
AND TRAMMELS
Divider Ball Points
with holder
No. 88 Series
4⬙, 7 1/2⬙ (100, 188mm)
These accessories are used with dividers
and trammels when it is necessary to use a
hole as a center point for layout, scribing
and measuring. The ball point is placed in
the hole and bears against the edge,
forming a seat for the divider leg or tram.
The set consists of either a 4⬙ or 7 1/2⬙
(100 or 188mm) holder with four balls.
They are not recommended for
exceptionally close work because it is
impossible to keep them exactly in the
center of the hole.
Complete set No. 88A including holder and four balls.
Complete Sets
Holder
Inch
mm
4⬙
100mm
7 1/2⬙
188mm
Balls
Inch
mm
Four:
1/2⬙
3/4⬙
1⬙
1 9/16⬙
13mm
19mm
25mm
40mm
Fits Starrett
Dividers
Nos. 85A, 85C,
No. 92 Series
Catalog
No.
EDP No.
88A
50410
Nos. 85B, 85D,
85E, 85F
88B
50411
Description
Fits Starrett
Dividers
Ball Only
Nos. 85A, 85C,
No. 92 Series
Catalog
No.
88C
88D
88E
88F
88G
EDP No.
72005
72006
72007
72008
72009
Nos. 85B, 85D,
85E, 85F
88H
72010
Individual Balls/Holders
Size
Inch
1/2⬙
3/4⬙
1⬙
1 9/16⬙
4⬙
mm
13mm
19mm
25mm
40mm
100mm
7 1/2⬙
188mm
Holder Only
365
CALIPERS, DIVIDERS
AND TRAMMELS
Improved Trammel
Heads with divider
points, pencil socket
No. 50 Series
Used to measure the distance between
points that are too great to be reached with
dividers. The heads are die cast with black
wrinkle finish and have hardened, forged
steel divider points. The points screw into
the heads, and the pencil socket
accompanying each set of trammel heads
can be used in place of either point.
No. 50A has an adjustable point. Longer
points (5⬙/125mm) are also available.
A beam is not furnished with these
trammels. The heads will accommodate
a beam up to 3/8⬙ (9.5mm) thick and
3/4⬙ (19mm) wide.
No. 50A Trammel Heads with points (adjustable point capability on right side head) mounted on
beam (not furnished) for demonstration purposes. Pencil socket (lower left) can screw into a
head in place of points if drawing (instead of scribing) is desired.
Trammel Heads
Point Size
Inch
mm
3, 2 1/2⬙ 75, 63mm
3⬙
75mm
Description
(Adjustable) Includes 2 Heads,
2 Points, Pencil Socket
Includes 2 Heads, 2 Points,
Pencil Socket
Catalog No.
EDP No.
50A
50268
50B
50269
50CA
50270
50CB
50271
(Longer) Points Only
5, 4 1/2⬙ 125, 113mm
5⬙
366
125mm
2 Adjustable Points for Starrett
No. 50A
2 Points for Starrett No. 50B
CALIPERS, DIVIDERS
AND TRAMMELS
Trammel Heads, Divider
Points, Attachments
No. 59 Series
The No. 59 Series is very useful for laying
out and scribing circles beyond the capacity
of ordinary dividers. The trammel heads
have a clamping device that firmly holds
various attachments.
The attachments consist of two sizes of
caliper legs, 6⬙, 9 1/2⬙ (150, 238mm),
two sizes of divider points 6⬙, 9⬙
(150, 225mm) which are eccentric for close
settings, and a set of four ball points with
holder. The ball points with 6⬙
(150mm) holder are for scribing circles
from the center of any hole up to 1 1/2⬙ (38
mm) in diameter. One of the large caliper
legs features a joint operated by an
eccentric thumb piece for fine adjustments.
A pencil may be clamped in either head in
place of the caliper legs or divider points.
The heads will accommodate any size
beam from 3/4-1 1/2⬙ (19-38mm) in width.
Since beam length requirements vary
widely, and they are easy for the user to
fashion, we do not furnish a beam.
No. 59F Set, complete (beam not furnished).
Description
2 Trammel Heads, 2 Small Points (6⬙/150mm)
Set of 4 Ball Points and One Holder Only
Pair Small Caliper Legs Only (6⬙/150mm)
Pair Large Caliper Legs Only (9 1/2⬙/228mm)
Large Points Only (9⬙/225mm)
Complete Set: Nos. 59A, B, C, D, E
Catalog No.
59A
59B
59C
59D
59E
59F
EDP No.
50297
50298
50299
50300
50301
50302
367
CALIPERS, DIVIDERS
AND TRAMMELS
Steel Beam Trammels
and Attachments
No. C251 Series
10 1/2 - 20⬙ (260 - 500mm) Beams
A rigid, well-designed trammel for layout,
scribing, and measuring distances and
circles. The top of the beam is flattened so
that when the trams are clamped in
position, they will not turn from pressure on
the points. The trams are held in place by
spring friction, which prevents them from
sliding when the nuts are loosened for
setting. One tram has a fine-adjusting
screw for the points.
No. C251A.
F
Each tram has a knurled swivel grip at the
top that turns freely, making it very
convenient to swing the tool when scribing
circles. The 3⬙ (75mm) points may be
adjusted for length in the spring chucks
and can be easily replaced with caliper legs
or other attachments listed. The ball points
with 3⬙ (75mm) holder permit working from
holes up to 1 1/2⬙ (38mm) in diameter. A
pair of 3⬙ (75mm) caliper points is included
with each trammel.
◆ Ideal for draftsmen, engineers, metalworkers for layout work, scribing and
measuring
◆ Furnished with rigid steel beam –
10 1/2⬙ (263mm), 14 1/2⬙ (360mm) or
20⬙ (500mm) sizes
◆ Bright chrome finish for longer life,
resistance to corrosion
◆ Highly versatile – handy attachments
available to extend range and measure
J
H
E
D
Attachments; D, E, J, H.
Trammels
Max.
Dividing Range
Inch
mm
9⬙
225mm
13 1/2⬙ 338mm
18⬙
450mm
Max. Circle Scribing
Diameter Range
Inch
mm
18⬙
450mm
26⬙
650mm
36⬙
900mm
Beam Size
Inch
mm
10 1/2⬙ 263mm
14 1/2⬙ 363mm
20⬙
500mm
Catalog No.
C251A
C251B
C251C
EDP No.
51205
51207
51209
Individual Attachments Only
Packed one in a box. Attractive, protective
cases are available for trammels Nos. C251A,
B, C. To order, add “ZZ” to catalog number.
(Example: C251AZZ).
368
Description
Coupling, with Extra 20⬙ (600mm) Beam
(When used with No. C251C will scribe circle
72⬙ [1800mm] diameter)
Ball Points and Holder
Extra Caliper Points, Pair
Steel Point and Socket (One) (Has .076⬙ [1.9mm]
hole diameter to hold leads)
Needle Point (Chrome not available) (One)
Photo Key
Catalog No. EDP No.
D
C251D
51211
E
F
C251E
251F
51212
51213
H
C251H
51214
J
251J
51203
J.W. DONCHIN CO.
www.jwdonchin.com
Precision Measuring Equipment and Industrial Supplies since 1924.
4841 W. Chicago Ave. - Chicago, IL 60651 • Phone: 773-261-2182 • Fax: 773-261-2867 • [email protected]
J.W. Donchin Co. was established in 1924 and has been known world wide ever since. Customer Service is our Main Focus. We offer
Expert Product Knowledge, Large Stocking Inventory and Competitive Pricing to assist you in locating and selecting the correct
tool or product to fit your needs. (J.W. Donchin Co. is one of L.S. Starrett’s largest stocking distributors.)
Contact Information:
Phone:
773-261-2182
Fax:
773-261-2867
Email:
[email protected]
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