Machine Design
In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called

Diametral pitch
Module
Normal pitch
Axial pitch

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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

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

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