Question

A cam should be designed only using uniform rise and fall throughout the cam, without any dwell period and rise and fall periods should be same. The maximum rise in follower is 50 mm. How much the follower will rise when the shaft is rotated to an angle of 120 degrees?

(a) 25 mm

(b) 43.3 mm

(c) 33.3 mm

(d) 30 mm

I had been asked this question by my college director while I was bunking the class.

This intriguing question comes from Cam in division Curves used in Engineering Practice of Engineering Drawing

Answer 1

The correct choice is (c) 33.3 mm

The best I can explain: Given a cam profile is made throughout without any dwell and also with continuous rise- fall period. So at 180 degrees there will be maximum rise. Since it is uniform rise-fall it follows linear function. 50/180 x 120 = 33.3 mm.