Machine Design
The ball bearings are provided with a cage

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

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Machine Design
When a belt drive is transmitting maximum power,

Driving tension on slack side is equal to centrifugal tension
Effective tension is half of centrifugal tension
Driving tension on tight side is twice the centrifugal tension
Effective tension is equal to centrifugal tension

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Machine Design
The flank of the tooth is the

Surface of the tooth above the pitch surface
Width of the tooth measured along the pitch circle
Surface of the tooth below the pitch surface
Surface of the top of the tooth

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