Question

In Oldham’s coupling the condition for maximum speed ratio is

(a) w1cosα/W

(b) w1sinα/W

(c) w1/W = 1/cosα

(d) w1/W = 1/sinα

I had been asked this question at a job interview.

Question is from Types of Kinematic Chains in division Simple Mechanisms of Machine Kinematics

Answer 1

Correct answer is (c) w1/W = 1/cosα

Explanation: w1/W = cosα/1 – cos^2ϴsin^2α

For maximum speed ratio cos^2ϴ = 1

Therefore, w1/W = 1/cosα.