Machine Design
A flange coupling is used to connect two shafts

Which are not in exact alignment
Have lateral misalignment
Whose axes intersect at a small angle
Which are perfectly aligned

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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

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

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