Theory of Machine
The maximum fluctuation of speed is the

Sum of maximum and minimum speeds
Difference of the maximum and minimum speeds
Variations of speed above and below the mean resisting torque line
Difference of minimum fluctuation of speed and the mean speed

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Theory of Machine
Crowning on pulleys helps

For automatic adjustment of belt position so that belt runs centrally
In decreasing the slip of the belt
In increasing velocity ratio
Increase belt and pulley life

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