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Ryerson University Department of Mechanical and Industrial Engineering MEC411 Final Evaluation, Part 3, Winter 2020 April 9
th
Duration: 45 minutes Instructor: Kourosh Zareinia
This examination is OPEN TEXTBOOK. Please show all your work in the space below each question. NAME: ID: By submitting my exam online: " I solemnly declare that I will complete this examination independently, with full compliance to the Senate Policy 60 Academic Integrity, and meeting the requirements stated in the examination.
"
Question A. Consider the following input parameters for a disk cam with a translating knife edge follower with zero offset (CAM rotates in CCW direction): Base circle diameter ࠵?
"
= 4.0 ࠵?࠵?
Interval Initial angle for interval (deg) Final angle for interval (deg) Type of motion Rise (+) or Return (-) cm 1 0 135 Parabolic 2.5 2 135 225 Dwell 0 3 225 360 Harmonic -2.5 i)
Compute the follower displacement for these angles analytically using equations in the textbook: (
࠵? = 45°,85°, 150°, 180°, 250°,320°
) ii)
Plot the displacement diagram iii)
Construct the cam profile graphically.
Question B. Consider the following input parameters for a disk cam with a translating knife edge follower with zero offset (CAM rotates in CCW direction): Base circle diameter ࠵?
"
= 4.0 ࠵?࠵?
Interval Initial angle for interval (deg) Final angle for interval (deg) Type of motion Rise (+) or Return (-) cm 1 0 100 Harmonic 1.5 2 100 200 Dwell 0 3 200 360 Uniform -1.5 i)
Compute the follower displacement for these angles analytically using equations in the textbook: (
࠵? = 40°, 80°, 120°,180°, 225°, 300°
) ii)
Plot the displacement diagram iii)
Construct the cam profile graphically.
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