INTRODUCTION
A gear is a rotating circular machine part having cut teeth or, in the case of a cogwheel or gearwheel, inserted teeth called cogs which mesh with another compatible toothed part to transmit (convert) torque and speed. The basic principle behind the operation of gears is analogous to the basic principle of levers. Geared devices can change the speed, torque, and direction of a power source. Gears of different sizes produce a change in torque, creating a mechanical advantage, through their gear ratio, and thus may be considered a simple machine.
Definition of a Gear
Gear is a toothed wheel used to transmit motion from one shaft to another, to change speed and direction in machines. Gear can also be defined as a kind of machine element in which teeth are cut around cylindrical or cone shaped surfaces with equal spacing. They can be made of plastics or metals.
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