The worm rotates against the wheel, and the screw face pushes on the teeth of the wheel. Most worms (but not all) are at the bottom.Īn electric motor or engine applies rotational power via to the worm. They are typically comprised of a steel worm and a brass wheel.įigure 1. It changes the rotational movement by 90 degrees, and the plane of movement also changes due to the position of the worm on the worm wheel (or simply "the wheel"). Basically, a worm gear is a screw butted up against what looks like a standard spur gear with slightly angled and curved teeth. Worm gears are an old style of gear, and a version of one of the six simple machines. A worm gear is a gear consisting of a shaft with a spiral thread that engages with and drives a toothed wheel.
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