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

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

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Machine Design
A fast and loose pulley drive is used when

Shafts are arranged parallel and rotate in the same directions
Shafts are arranged parallel and rotate in the opposite directions
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Shafts are arranged at right angles and rotate in one definite direction

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