Theory of Machine
The Klein's diagram is useful to find

Acceleration of various parts
Displacement of various parts
Velocity of various parts
Angular acceleration of various parts

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Theory of Machine
In a circular arc cam with roller follower, the acceleration in any position of the lift will depend only upon

Total lift, total angle of lift, minimum radius of cam and cam speed
Mass of cam follower linkage, spring stiffness and cam speed
Radius of circular arc, cam speed, location of centre of circular arc and roller diameter
Total lift, centre of gravity of the cam and cam speed

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