Machine Design
The ball bearings are provided with a cage

To maintain the balls at a fixed distance apart
To prevent the lubricant from flowing out
To reduce friction
To facilitate slipping of balls

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Machine Design
Set screws are

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

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