Machine Design
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set in order to

Reduce slip
Ensure uniform loading
Ensure proper alignment
Reduce vibration

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Machine Design
Machine screws are

Similar to stud
Slotted for a screw driver and generally used with a nut
Used to prevent relative motion between two parts
Similar to small size tap bolts except that a greater variety of shapes of heads are available

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