Machine Design
Pitch point of a cam is

Any point on the pitch circle
Any point on the pitch curve
A point on the pitch curve having maximum pressure angle
A point on the pitch curve having minimum pressure angle

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Machine Design
Crowning on pulley helps

In decreasing the slip of the belt
To increase pulley life
In increasing the slip of the belt
To keep the belt in centre on a pulley while it is in motion

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