Machine Design
The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called

Clearance
Working depth
Face width
Backlash

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Machine Design
When a belt drive is transmitting maximum power,

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

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