Theory of Machine
Whirling speed of the shaft is the speed at which

Combination of transverse and longitudinal vibration occurs
Shaft tends to vibrate vigorously in transverse direction
Shaft tends to vibrate in longitudinal direction
Torsional vibrations occur

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Theory of Machine
Cam angle is defined as the angle

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
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

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