Machine Design
The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called

Working depth
Face width
Clearance
Backlash

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

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

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