Machine Design
In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because

New and old belts will cause vibrations
Only one belt cannot be fitted with other used belts
Belts are available in sets
The new belt will carry more than its share and result in short life

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Machine Design
The flank of the tooth is the

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

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