The second are single-throated worm gears, in which the worm wheel is throated. These don't have a throat, or groove, machined around the circumference of either the worm or worm wheel. A double bass features worm gears as tuning mechanismsTypesThere are three different types of gears that can be used in a worm drive.The first are non-throated worm gears. Therefore, if the diametrical pitch (DP) of each gear is the same, then, in terms of the physical size of the 240 tooth gear to that of the 20 tooth gear, the worm arrangement is considerably smaller in volume. With spur gears, a gear of 12 teeth must match with a 240 tooth gear to achieve the same 20:1 ratio. Therefore, regardless of the worm's size (sensible engineering limits notwithstanding), the gear ratio is the 'size of the worm wheel - to - 1'.Given a single start worm, a 20 tooth worm wheel reduces the speed by the ratio of 20:1. A worm is an example of a screw, one of the six simple machines.One of the major advantages of worm gear drive units are that they can transfer motion in 90 degrees.Contents1 Explanation2 Types3 Direction of transmission4 Applications5 Left hand and right hand worm6 Manufacture7 History8 See also9 References9.1 Bibliography10 External linksExplanation Worm gear with 4-start worm and throated gear wheelA gearbox designed using a worm and worm-wheel is considerably smaller than one made from plain spur gears, and has its drive axes at 90° to each other.With a single start worm, for each 360° turn of the worm, the worm-wheel advances only one tooth of the gear wheel. The terminology is often confused by imprecise use of the term worm gear to refer to the worm, the worm gear, or the worm drive as a unit.Like other gear arrangements, a worm drive can reduce rotational speed or transmit higher torque. The two elements are also called the worm screw and worm wheel. Worm and worm gearA worm drive is a gear arrangement in which a worm (which is a gear in the form of a screw) meshes with a worm gear (which is similar in appearance to a spur gear).
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From Wikipedia, the free encyclopedia Jump to navigation Jump to search For the computing term 'WORM drive', see Write Once Read Many.
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