Machine Design
An open belt drive is used when

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

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Machine Design
Cap screws are

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

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