Machine Design
The centre distance between two meshing involute gears is equal to

Difference of base circle radii/cosφ
Difference of pitch circle radii/cosφ
Sum of pitch circle radii/cosφ
Sum of base circle radii/cosφ

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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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