Question

A cam should be designed only using uniform rise and fall within half of the cam, the remaining is dwell period, and without any dwell period in between the rise-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 45 degrees from its initial position of a cam?

(a) 22.5

(b) 0

(c) 30

(d) 15

This question was addressed to me during an interview.

Origin of the question is Cam in portion Curves used in Engineering Practice of Engineering Drawing

Answer 1

Right choice is (a) 22.5

Easy explanation: According to the given conditions there is only movement in follower up to 180 degrees of shaft rotation and between it at the middle the follower make maximum rise that is at 90 degrees. 90- 45 = 45 degrees. For 90 degrees it is 45 mm so for 45 degrees it will be 45/2 = 22.5 mm when the follower is 45 degrees from its initial position of the cam.