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There is one particularly glaring reason why one would not choose a worm gear over a standard gear: lubrication. This necessitates adding a backstop to a standard gearbox, further increasing the complication of the gear set. On a standard gear, the input and output can be turned independently once enough force is applied. Because of the friction between the worm and the wheel, it is virtually impossible for a wheel with force applied to it to start the worm moving. It will typically take multiple reductions of a conventional gearset to achieve the same reduction level of a single worm gear - meaning users of worm gears have fewer moving parts and fewer places for failure.Ī second reason to use a worm gear is the inability to reverse the direction of power. Thus you can use it to either greatly increase torque or greatly reduce speed. A worm gear can have a massive reduction ratio with little effort - all one must do is add circumference to the wheel. The first one is the high reduction ratio. There are a few reasons why one would choose a worm gear over a standard gear. 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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