1. 1
Engineering Design and Graphics 1C03 McMaster Engineering 1
Cornerstone Project
Instructor: Dr.McDonald
Part 1 – Mechanical Design Research Report
Group 9
As a future member of the engineering profession,the student is responsiblefor performing the required
work in an honest manner, without plagiarismand cheating.Submitting this work with my name and
student number is a statement and understandingthat this work is my own and adheres to the Academic
Integrity Policy of McMaster University and the Code of Conduct of the Professional Engineers of Ontario.
Submitted by [Keyur Patel] ____________
As a future member of the engineering profession,the student is responsiblefor performing the required
work in an honest manner, without plagiarismand cheating.Submitting this work with my name and
student number is a statement and understandingthat this work is my own and adheres to the Academic
Integrity Policy of McMaster University and the Code of Conduct of the Professional Engineers of Ontario.
Submitted by [Griffin Dow] ____________
As a future member of the engineering profession,the student is responsiblefor performing the required
work in an honest manner, without plagiarismand cheating.Submitting this work with my name and
student number is a statement and understandingthat this work is my own and adheres to the Academic
Integrity Policy of McMaster University and the Code of Conduct of the Professional Engineers of Ontario.
Submitted by [Abiran Raveenthiran] ____________
2. 2
Table Of Contents
Cover Page 1
Table of Contents 2
Introduction 3
Description 3
Calculations 3
Simplified Gear Train 4
Gear Information Chart 4
Team Contributions & Attendance 4
GANTT Chart 5
MapleSim 3D Model 6
MapleSim Plot Graphs 6
MapleSim 2D Model 7
Inventor Models 8
Index Of Drawings 9
Drawings 9
Citations 10
3. 3
Group nine consists three members; Keyur Patel, Griffin Dow and Abiran Raveenthiran.
We have been hired by XYZ Mechanisms to modify the design of their company product. In
order to approve our design the CEO will validate our design functionality through models and
calculations. Our model will include a full simulation and a completed prototype. This all will be
presentedinatechnical report,whichincludesacomplete setof engineeringdrawings.
The company product that Group nine will modify is a mechanism, which is used to
control the read-head of a CD-ROM drive. Group nine was provided with an alternate motor
with different drive characteristics. Group nine’sinput speedis 85500 RPM(1425 rev/sec). Using
these different characteristics, group nine has designed a gear train that achieves the original
read-head speed as the older design of the company product. The group has also been assigned
to designaframe for mountingandcontainingthe componentsforourgeartrain.
Description on How Mechanism Works
The motor runs at a constant pulsating speed of 85500 RPM. Our mechanism consists of
a gear train which slows down the input RPMto 6000 RPM. The 6000-RPMthen leads to a worm
with a rack that achieves the linear speed of 0.2121 m/s, which meets the client’s specifications.
The rack on the worm gear is attached to a read-head and the pulsating motor speed is what
enablesthe read-headtoreadCD ROMs.
Calculations
We approachedthisproblembydeterminingouroverall gearratio.A module of 1.5 was
predeterminedbythe groupandonlychangedthe module forone setof gears.We then
determinedhowmuchspace we had to workwithandusedthose dimensional constraintsand
the gear ratioto determine the numberof teeth.The nextstepinourprocesswasto determine
an extremelylarge multipleof ourgearratio so thatwe couldbreakitdownintomultiples,
whichwouldrepresentthe numberof teethforthe gearsinour train.We limitedthe multiples
to be betweenthe range of 12 and36. The multiplesthatwere usedare postedbelow.
Input Speed:9*9500 rpm= 85500 rpm
Output Speed:100*60 rpm = 6000 rpm
Gear Ratio = wi/wf =85500/6000 = 14.25
14.25/1 = 228000/16000 = (30*19*20*20) / (10*10*10*16)
14.25/1 = (30/10) * (19/16) * (20/10) * (20/10)
We wentaboutcalculatingthe gearsbytheirnumberof teeth.Bydoingthiswe ensured
that there wasan evenamountof teeth.If we approacheditby the diameterthenwe could
have had half teeth,whichwouldnotwork.The firstsetof gearshave 30 and ten teeth,theyare
thenaxiallyconnectedtoanothersetof gearsthathave 19 and16 teeth.Thatsetof gearsis
thenalsoaxiallyconnectedtoasetof gearswith20 and 10 teeththat are axiallyconnectedto
anothersetof gearsthat have 20 and 10 teeth. A lastset of two gearswhichbothhad 18 teeth
so the trainend inthe correct position.
4. 4
Gear train diagram
Team contributions and attendance
For the first milestone the team met every Monday and Thursday and the team
worked together to solve the gear ratios, create them on Autodesk and put them into
Maplesim. All members made all the meetings on time and ready to work. The tasks
were not exactly specified for any one person to do instead, we worked as a team to
accomplish everything that was required to do. Once we finished the first milestone we
immediately started worked on the final project.
For the final project the meetings were still held every Monday and Thursday
and everyone meet on time and contributed the whole time. Keyur Patel went to all five
prints and printed all the files in Epic Lab. Keyur also worked with Abiran Raveenthiran
to create the final gear train. Abiran created the final assembly of the gear train on
Autodesk Inventor 2011. Griffin Dow created the final Maplesim file to demonstrate
how the gears work. Griffin also created the frame on Autodesk for the gear train. The
whole team got together to assemble the frame and gears. Keyur and Abiran focused on
the gears while Griffin concentrated on putting together the frame.
Gear Name Pitch Diameter (mm) Module (mm) Number of Teeth
A 12 1.2 10
B 36 1.2 30
C 24 1.5 16
D 28.5 1.5 19
E 15 1.5 10
F 30 1.5 20
G 15 1.5 10
H 30 1.5 20
I 18 1 18
J 18 1 18
![1
Engineering Design and Graphics 1C03 McMaster Engineering 1
Cornerstone Project
Instructor: Dr.McDonald
Part 1 – Mechanical Design Research Report
Group 9
As a future member of the engineering profession,the student is responsiblefor performing the required
work in an honest manner, without plagiarismand cheating.Submitting this work with my name and
student number is a statement and understandingthat this work is my own and adheres to the Academic
Integrity Policy of McMaster University and the Code of Conduct of the Professional Engineers of Ontario.
Submitted by [Keyur Patel] ____________
As a future member of the engineering profession,the student is responsiblefor performing the required
work in an honest manner, without plagiarismand cheating.Submitting this work with my name and
student number is a statement and understandingthat this work is my own and adheres to the Academic
Integrity Policy of McMaster University and the Code of Conduct of the Professional Engineers of Ontario.
Submitted by [Griffin Dow] ____________
As a future member of the engineering profession,the student is responsiblefor performing the required
work in an honest manner, without plagiarismand cheating.Submitting this work with my name and
student number is a statement and understandingthat this work is my own and adheres to the Academic
Integrity Policy of McMaster University and the Code of Conduct of the Professional Engineers of Ontario.
Submitted by [Abiran Raveenthiran] ____________](https://image.slidesharecdn.com/218fc32f-69c8-4c8c-863e-8f5f13824c99-150208214801-conversion-gate02/85/1c03projectlinkedin-1-320.jpg)
