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

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

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Machine Design
Set screws are

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

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