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A worm gear is a gear consisting of a shaft with a helical thread that meshes with and drives the gear.

The gearbox has the function of deceleration. Compared with ordinary gears, it has the advantages of a large reduction ratio and compact installation position.

Gear transmission systems are widely used in various industrial products and equipment, from designing, manufacturing, testing to applying, and form a technical field of its own. In recent years, with the development and manufacturing of high-tech products, the non-cutting gears as plastics and powder metallurgy are used with non-metal cutting precision pinion transmission mechanisms more and more often as the metal cutting gears.