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
In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done

Because of loose contact of follower with cam surface
In order to have acceleration in beginning and retardation at the end of stroke within the finite limits
Because of difficulty in manufacturing cam profile
Because the uniform velocity motion is a partial parabolic motion

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