Machine Design
In order to withstand resistance to wear, the best profile of gear is

14½° full depth involute tooth
14½° stub tooth
20° involute stub tooth
20° full depth involute tooth

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Machine Design
Crowning on pulley helps

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

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