Machine Design
The face of the tooth is the

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

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Machine Design
Coaxing is the procedure of increasing

Metal strength by cycling
Fatigue limit by over-stressing the metal by successively increasing loadings
Metal hardness by surface treatment
Metal resistance to corrosion by coating

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