Question

A cam should be designed only using uniform rise and fall within the second half of cam profile, the first half is dwell period, without any dwell period in between the rise and fall periods and rise and fall periods should be same. The maximum rise in follower is 45 mm. How much the follower will rise when the follower is 120 degrees from its initial position of a cam?

(a) 15

(b) 30

(c) 20

(d) 0

This question was posed to me in an interview.

I want to ask this question from Cam in portion Curves used in Engineering Practice of Engineering Drawing

Answer 1

Correct option is (d) 0

Easy explanation: According to the given conditions there is only movement in follower from 180 degrees to 360 degrees of shaft rotation and between it, at the middle of rise-fall period the follower make maximum rise that is at 270 degrees. So the follower will not move since there is no rise or fall at angle 120 in cam designed.