Theory of Machine
Oldham’s coupling is an inversion of the kinematic chain used in

Elliptical trammels
Rotary engine
Whitworth quick return mechanism
Universal joint

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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
Through which the cam rotates during the period in which the follower remains in highest position
During which the follower returns to its initial position
Of rotation of the cam for a definite displacement of the follower

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