Machine Design
The objective of caulking in a riveted joint is to make the joint

Free from stress
Free from corrosion
Leak-proof
Stronger in tension

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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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