Machine Design
The creep in the belt is due to

Stresses beyond elastic limit of belt material
Effect of temperature on belt
Unequal extensions in the belt due to tight and slack side tensions
Material of belt

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Machine Design
An open belt drive is used when

Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the opposite directions
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Shafts are arranged parallel and rotate in the same directions

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