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

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

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Machine Design
The flank of the tooth is the

Surface of the tooth above the pitch surface
Width of the tooth measured along the pitch circle
Surface of the top of the tooth
Surface of the tooth below the pitch surface

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