Worm gears are usually used when large velocity reductions are needed. The decrease ratio is determined by the number of starts of the worm and number of tooth on the worm equipment. But worm gears have sliding get in touch with which is quiet but will produce heat and have relatively low transmission performance.
As for the materials for production, in general, worm is constructed of hard metal while the worm gear is made from relatively soft metallic such as for example aluminum bronze. That is because the number of teeth on the worm gear is relatively high in comparison to worm with its number of starts being generally 1 to 4, by reducing the worm equipment hardness, the friction on the worm teeth is reduced. Another feature of worm manufacturing is the need of specialized machine for gear cutting and tooth grinding of worms. The worm gear, on the other hand, may be made with the hobbing machine used for spur gears. But due to the various tooth shape, it is not possible to cut a number of gears simultaneously by stacking the gear blanks as can be carried out with spur gears.
The applications for worm gears include gear boxes, angling pole reels, guitar string tuning pegs, and in which a delicate velocity adjustment by utilizing a big speed reduction is needed. When you can rotate the worm equipment by worm, it is normally extremely hard to rotate worm utilizing the worm gear. That is called the self locking feature. The self locking feature cannot continually be assured and a separate method is preferred for true positive reverse prevention.
Also there exists duplex worm gear type. When working with these, you’ll be able to modify backlash, as when the teeth use necessitates backlash adjustment, without needing a change in the guts distance. There are not too many producers who can create this kind of worm.
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