mechanisms

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HW5

Problem

You are part of a design team for designing a new plate cam with a radial reciprocating roller follower. The input, rise and fall and the output motion is shown in the following table. The base circle has a diameter 3 in and the diameter of the roller is 1 in. Displacements are specified as follow:

Input angle (deg)	Lift L (in)	Output y
0o-90o	3	Cycloidal rise
90o-105o	0	Dwell
105o-195o	-3	Cycloidal fall
195o-210o	0	Dwell
210o-270o	2	Simple harmonic rise
270o-285o	0	Dwell
285o-345o	-2	Simple harmonic fall
345o-360o	0	Dwell

Project Objectives

1. Obtain and plot the lift curve (the displacement diagram) and the profile of the cam

2. Identify on your cam profile the locations and the value of the largest angle. Would the pressure angle cause difficulties for a practical cam-follower system?

3. Identify on your cam profile the location of discontinuities in position, velocity, and acceleration.

4. For the values given in Table above, what design changes would you suggest to improve the cam design?

Reporting

Submit one report per student. Include the following sections:

1. Cover Page

2. Objective Statement

3. Analysis of Problem and Results

4. Conclusions

Appendix with Calculations and Code used in software