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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Machine Design
Cold working

Has no influence on fatigue strength
Alone has no influence on fatigue strength
Increases the fatigue strength
Decreases the fatigue strength

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