Machine Design
Set screws are

Slotted for a screw driver and generally used with a nut
Similar to stud
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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Machine Design
Crowning on pulley helps

In increasing the slip of the belt
To increase pulley life
In decreasing the slip of the belt
To keep the belt in centre on a pulley while it is in motion

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