Machine Design
Lewis equation in gears is used to find the

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

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Machine Design
In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because

Only one belt cannot be fitted with other used belts
The new belt will carry more than its share and result in short life
Belts are available in sets
New and old belts will cause vibrations

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