Theory of Machine
Flexible coupling is used because

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

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

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

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