Machine Design
The velocity factor for ordinary cut gears operating at velocities up to 12.5 m/s is equal to

6/(6 + v)
4.5/(4.5 + v)
0.75/(0.75 + √v)
3/(3 + v)

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Machine Design
Form coefficient of spring is

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

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