Machine Design
The face angle of a bevel gear is equal to

Pitch angle + addendum angle
Pitch angle - addendum angle
Pitch angle + dedendum angle
Pitch angle - dedendum angle

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Machine Design
A fast and loose pulley drive is used when

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 at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the same directions

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