Machine Design
Set screws are

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

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Machine Design
Crowning on pulley helps

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

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