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

Ensure proper alignment
Ensure uniform loading
Reduce vibration
Reduce slip

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Machine Design
Set screws are

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

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Machine Design
The face of the tooth is the

Surface of the top of the tooth
Surface of the tooth below the pitch surface
Width of the tooth measured along the pitch circle
Surface of the tooth above the pitch surface

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