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Worm Wheel Gear
Worm gears are constructed of a worm and a gear (sometimes referred to as a worm wheel), with non-parallel, non-intersecting shafts oriented 90 degrees to each other. The worm is analogous to a screw with a V-type thread, and the gear is analogous to a spur gear. The worm is typically the driving component, with the worm’s thread advancing the teeth of the gear.
Worm gears can be used to either greatly increase torque or greatly reduce speed . They are also the smoothest and quietest of the gear systems, as long as they are properly mounted and lubricated.