RYOBI HP472 7.2V CORDLESS DRILL

14:650:388
CAD in Mechanical Engineering
GROUP PROJECT PROPOSAL
RYOBI HP472 7.2V CORDLESS DRILL-DRIVER
PROJECT PROPOSAL
Team Members
Vishal S. Patel
Sarjeet Patel
Rahul Dandu
Anay Amin
O
BJECTIVE: -OBJECTIVE:
Our main objective is to effectively model, assemble, and animate the various and intricate parts that
make up a cordless battery operated drill. The drill operates on a 7.2 V DC motor, encloses a 3/8 in. keyless
chuck, and transmits a maximum torque of 55 in.lb. Other features include a 24 position clutch and a 2 speed
switch, a rotation selector, a switch lock, and a level on top of the drill to help increase the horizontal
accuracy of drilling. The modeling aspect of the project mainly involves, but is not limited to, the outer
plastic casing of the drill, the electric motor, transmission (including gears, ball bearings etc) and the chuck.
The other objective of this project is to do Finite Element Analysis (FEA) on certain parts of this drill driver
using either ANSYS or Pro-Mechanica to provide us with the knowledge of critical parts and locations in a
mechanism.
CCHALLENGES:
HALLENGES: -The cordless drill-driver that we selected for our project has multiple uses including drill, screw driver
with varying sizes and as ratchet. To accomplish all these purposes the assembly of the drill-driver is made
such that it can withstand all the levels of torques provided by it for various purposes. Due to this there were
many challenges that we encountered while disassembling the drill-driver. The part that connects the chuck
body, chuck jaws and the torque adjustment ring has an intricate connection that we are still trying to figure
out a way to take apart without damaging the internal delicate mechanism. This part is also responsible for
working as a clutch that helps change the gear ratio thereby changing the speeds from 1 through 24. One of
the most important parts of solid modeling will be the making of the outer casing of the drill-driver because
of all the curves and interlocking features. The modeling of the gears in the transmission as well as the
keyless chuck will be an important part in the working of the whole system. The transmission along with all
the gears which we desire to make using the right dimension would be a challenge in itself. Also we plan to
do FEA which is something that none of us have ever done earlier.
The following pictures give a better understanding of the internal mechanism of the drill-driver and
other important information: -
5.
6
1.
2.
7.
4.
3.
RYOBI CORDLESS DRILL
1.
Keyless Chuck
2.
Torque Adjustment Ring
3.
Battery Pack
4.
Rocker Switch
5.
24 Speed Clutch Positions
6.
Chuck Jaws
7.
Switch
32.
OUTER CASING OF DRILL
8.
9.
13.
12.
11.
10.
14.
EXPLODED VIEW OF CORE DRILL COMPONENTS
8.
Electric Motor
9.
Power transmitting gear
10.
2 Speed Switch
11.
Transmission Assembly
12.
Transmission Housing
13.
Rocker Switch Attachment
14.
Power Connections
18.
15.
16.
17.
REAR VIEW OF TRANSMISSION
TRANSMISSION HOUSING WITH
GEARS
15.
Gears Connected to Motor Shaft
16.
Bi-level Gear Plate
17.
Gears Connected with Chuck
18.
Transmission Assembly (detailed
view)
30.
34.
27.
26.
28.
31.
29.
KEYLESS CHUCK AND ITS COMPONENTS
20.
22.
21.
23.
19.
24.
33.
25.
DRILL TOOLS
19.
Double Ended Srew Driver Bit
20.
Flat Screw Driver Bit
21.
Drill Bit
22.
Ratchet Head
23.
Ratchet Fixture Center Piece
24.
Chuck-Accessory Fixture Head
25.
Hex-Screw Driver Bit
26.
Outer Casing for Chuck Sleeve
27.
3-Chuck Guide Head
28.
Chuck Sleeve
29.
Torque Control Collar
30.
Outer Casing for Clutch Assembly
31.
Transmission Housing
32.
Outer Casing
33.
Star Screw Driver Bit
34.
Locking Wire Ring
EEXPECTED
XPECTED RRESULTS:
ESULTS: -Upon completion of the project, we expect to be able to model and assemble the whole drill-driver
using Pro-Engineer Wildfire 2.0 using appropriate connections. The drill-driver is expected to deliver a
maximum torque of 55 in. lb. We expect to learn the appropriate method to achieve the curved surface of
outer casing as close to the original as possible. We expect to learn how to use the ANSYS or Pro-Mechanica
software for FEA. If possible we would also like to make a quarter scale prototype of certain parts of our
design using Rapid Prototyping machine to provide us with a better understanding of our project workability.
W
ORK D
ISTRIBUTION: -WORK
DISTRIBUTION:
The primary work distribution among the members is done as follows but the responsibility of any
member is not limited to the work assigned here and is subject to change based on the need and project
requirement.
V
Viisshhaall PPaatteell
Æ
Æ Chuck Mechanism with clutch that assists change in gear ratios and outer cover sleeves.
SSaarrjjeeeett PPaatteell
Æ
Æ Outer casting, magnetic tape to hold attachments, level indicator and switches.
RRaahhuull D
Daanndduu
Æ
Æ Transmission assembly with gears, transmission housing and drill-driver attachments..
A
Annaayy A
Am
miinn
Æ Electronic components including switches, charger port, battery and other components not
covered by other members. Also responsible for assembly of various parts made by all the
members.
In addition to all the above mentioned responsibilities the members are responsible for doing FEA as
a team task.
RREFERENCE:
EFERENCE: -http://oneworld1.inetu.net/manuals/ryobi/HP472_500_eng.pdf
Ryobi 7.2V Cordless Drill-Driver HP472K