Machine Design
Lewis equation is applied

Only to the pinion
To stronger of the pinion or gear
To weaker of the pinion or gear
Only to the gear

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Machine Design
In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of

Combined effect of transverse shear stress and curvature of wire
Combined effect of torsional shear stress and transverse shear stress in the wire
Combined effect of bending stress and curvature of the wire
Combined effect of transverse shear stress and bending stress in the wire

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