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

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Machine Design
Form coefficient of spring is

Ratio of coil diameter to wire diameter
Concerned with strength of wire of spring
Load required to produce unit deflection
Its capability of storing energy

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