Machine Design
The ball bearings are provided with a cage

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

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Machine Design
When a belt drive is transmitting maximum power,

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

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