Machine Design
The face of the tooth is the

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

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Machine Design
The contact ratio is the ratio of

Length of path of contact to the circular pitch
Length of arc of contact to the circular pitch
Length of arc of recess to the circular pitch
Length of arc of approach to the circular pitch

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