Theory of Machine
Cam angle is defined as the angle

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

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Theory of Machine
In elliptical trammels

One pair turning and three pairs sliding
Two pairs turning and two pairs sliding
Three pairs turning and one pair sliding
All four pairs are turning

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