Machine Design
When a belt drive is transmitting maximum power,

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
Effective tension is half of centrifugal tension

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Machine Design
Spring stiffness is

Ratio of coil diameter to wire diameter
Load required to produce unit deflection
Its capability of storing energy
Its ability to absorb shocks

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