Machine Design
Lewis equation in gears is used to find the

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

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Machine Design
Cap screws are

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

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