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
Effective tension is equal to centrifugal tension
Driving tension on slack side is equal to centrifugal tension

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Machine Design
Spring stiffness is

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

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