Theory of Machine
Creep in belt drive is due to

Material of the pulley
Material of the belt
Larger size of the driver pulley
Uneven extensions and contractions due to varying tension

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Theory of Machine
Angle of action of cam 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
Moved by the cam from beginning of ascent to the termination of descent

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