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

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

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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

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

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