worm wheel

Worm gears are usually used when large acceleration reductions are needed. The decrease ratio depends upon the number of starts of the worm and amount of teeth on the worm equipment. But worm gears have sliding contact which is quiet but tends to produce heat and also have relatively low transmission performance.
As for the materials for production, in general, worm is made of hard metal as the worm gear is manufactured out of relatively soft metal such as aluminum bronze. That is since the number of teeth on the worm gear is relatively high compared to worm using its number of begins being generally 1 to 4, by reducing the worm equipment hardness, the friction on the worm the teeth is reduced. Another feature of worm manufacturing may be the need of specific machine for gear cutting and tooth grinding of worms. The worm equipment, however, may be made out of the hobbing machine utilized for spur gears. But due to the various tooth shape, it is not possible to cut many gears at once by stacking the gear blanks as can be carried out with spur gears.
The applications for worm gears include equipment boxes, fishing pole reels, guitar string tuning pegs, and in which a delicate swiftness adjustment by utilizing a sizable speed reduction is needed. When you can rotate the worm equipment by worm, it is generally extremely hard to rotate worm by using the worm gear. This is called the personal locking feature. The self locking feature cannot always be assured and a separate method is recommended for accurate positive worm wheel china reverse prevention.

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