Chapter 11 - Gear Manufacturing
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A gear is a wheel provided with teeth which mesh with the teeth on another wheel, or on to a rack, so as to give a positive transmission of motion from one component to another.Gears constitute the most commonly used device for power transmission or for changing power-speed ratios in a power system. They also afford a convenient way of changing the direction of motion. A number of devices such as differentials, transmission gear boxes, planetary drives etc., used in many construction machines employ gears as basic
Gears are made from both metals as well as non-metals. ‘‘Metals’’ normally used for making gears include cast iron, cast steel, structural steel, gun metal, brass, etc. The ‘‘non-metals’’ commonly used for gear manufacture include synthetic plastic, fibres and laminated wood.
With rapid industrialisation, the gears are called upon to yield noise free operation,ensure high load carrying capacity at a constant velocity ratio. The wear and fatigue strength of the gear tooth are the factors that govern its durability and reliability, and depend to a large extent on the manufacturing technology employed.