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
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

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Machine Design
When the shaft rotates in anticlockwise direction at high speed in a bearing, it will

Have contact at the bottom most of the bearing
Move towards right of the bearing making no metal to metal contact
Move towards right of the bearing making metal to metal contact
Move towards left of the bearing making metal to metal contact

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