Theory of Machine
Flexible coupling is used because

It is easy to engage and disengage
It is easy to disassemble
It prevents shock transmission and eliminates stress reversals
It transmits shocks gradually

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Theory of Machine
Angle of action of cam is defined as the angle

Through which the cam rotates during the period in which the follower remains in the highest position
Moved by the cam from beginning of ascent to the termination of descent
Of rotation of the cam for a definite displacement of the follower
Moved by the cam from the instant the follower begins to rise, till it reaches its highest position

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