Machine Design
Lewis equation in gears is used to find the

Shear stress
Tensile stress in bending
Compressive stress in bending
Fatigue stress

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Machine Design
Set screws are

Similar to stud
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Slotted for a screw driver and generally used with a nut
Used to prevent relative motion between parts

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