Posted: May 3rd, 2023

Mechanisms Dynamics / Machinery essay

ME320 Fall 2020 Term Project Page 1 of 3

ME 320 Cam Design Project

Fall 2020 v2

Design a cam to move a translating roller follower through 6 inches in 90o, dwell for 30o, fall 3

inches in 90o, dwell for 30o, fall 3 inches in 90o, and dwell for the remainder.

Height Profile (segments)

Rise 0 90  6 inches Dwell 90 120  Fall 120 210  3 inches Dwell 210 240  Fall 240 330  0 Dwell 330 360 

Camshaft angular velocity is constant at 20 rad/s ccw . Size the cam and roller follower given

the constraints below. The radius of the roller is 0.5 inch. Find the spring constant and spring

preload to maintain contact between the cam and follower. The follower’s effective weight is

2 lbs and damping is 15% of critical (c=0.15). Calculate the dynamic force function of the cam.

Find the system natural frequency with the selected spring. Your submission will be a word

document and submitted on Blackboard

Constraints:

• The rise and fall functions you select must result in a smooth transition from one

displacement segment to the other.

• Determine the minimum prime circle radius to give a maximum 20o pressure angle.

Note that eccentricity can be introduced to obtain an acceptable pressure angle if

needed. This may require iteration on your part to find an acceptable prime circle

radius, roller follower radius, and if necessary, follower eccentricity.

• Good cam designers keep the absolute value of the minimum radius of curvature ρmin of

the cam pitch curve preferably at least 2 to 5 times as large as the roller radius. Your

design should meet this constraint.

• The spring force must keep the dynamic force positive for the entire cycle (force cannot

be negative). An insufficient spring allows follower jump, when the follower leaves the

cam surface because the spring does not have enough available force to keep the

follower in contact. You will need to calculate the maximum downward acceleration

and size the spring to offset the inertia force. You should have a margin of safety in your

spring design (should not be near zero).

Tools:

All analysis will be done with either MATLAB, Python, Excel, or Dynacam. You can use

multiple programs. All diagrams (SVAJ) diagrams must be done with one of these

programs.

ME320 Fall 2020 Term Project Page 2 of 3

Much of this project can be completed on Dynacam.

You can either download the software to your windows computer following the

instructions on BB or you can log on to the UIC CAD system remotely. If you elect to log

on to the CAD lab follow these instructions.

Goto https://cc-viewconnect.server.uic.edu/

Choose the option on the left “Install VM Horizon Client” This will take you to the VMware download site. Choose the proper client for your computer. There are installers for different platforms. Download and install.

After reboot, start the client “VMware Horizon Client” First time only upper left corner click on “New Server”

Enter cc-viewconnect.server.uic.edu

Log in using UIC credentials

If the computer you click on does not open when clicking on, right click on the Icon and make sure “Microsoft RDP” is checked.

Deliverables:

1. First page is in report format (typed) as follows:

• Abstract

• Table of Contents • List of Figures • List of Tables

• Problem Statement • Technical Content • Design Criteria • SVAJ diagram or diagrams. • Table of follower height relative to position for the full 360o of cam rotation. • All calculations. • Drawing of Cam profile. • Conclusion • Appendix • References • Code

2. Plot the SVAJ curves using your program of choice. For each rise or fall segment, you

will need to choose an appropriate function that meets the boundary conditions and

meets the constraint to minimize the follower’s peak velocity. Discuss which functions

you selected for the rise/fall segments and why in your abstract. Your SVAJ curves

should meet all boundary conditions and satisfy the Fundamental Law of Cam Design.

https://cc-viewconnect.server.uic.edu/
http://cc-viewconnect.server.uic.edu/
ME320 Fall 2020 Term Project Page 3 of 3

3. Provide a drawing (either by hand or CAD) of your cam-follower profile. This should be

your final design (after iteration) of your cam profile.

4. What is the minimum prime circle radius that meets the constraints?

5. What spring constant and preload is required to maintain contact between the cam and

follower? What is the system’s natural frequency with the selected spring?

6. Calculate and plot the dynamic force and torque required to run the cam.

7. Comment on the design process and your final design. These comments can be

included in your executive summary. Tabulate your final design parameters.

End

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