Machine Design
The flank of the tooth is the

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

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Machine Design
Coaxing is the procedure of increasing

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

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