Machine Design
A screw is said to be over hauling screw, if the

Friction angle is more than helix angle
Efficiency of screw is 100%
Friction angle is equal to helix angle
Friction angle is less than helix angle

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Machine Design
Form coefficient of spring is

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

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