Machine Design
The centre distance between two meshing involute gears is equal to

Sum of pitch circle radii/cosφ
Difference of pitch circle radii/cosφ
Sum of base circle radii/cosφ
Difference of base circle radii/cosφ

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Machine Design
Form coefficient of spring is

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

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