Worm gears are often used when large speed reductions are needed. The decrease ratio depends upon the number of begins of the worm and number 
of teeth on the worm gear. But worm gears have sliding get in touch with which is tranquil but will produce heat and have relatively low transmission efficiency.
As for the materials for creation, in general, worm is made of hard metal while the worm gear is made from relatively soft metallic such as aluminum bronze. This is since the number of the teeth on the worm gear is relatively high in comparison to worm using its number of starts being generally 1 to 4, by reducing the worm gear hardness, the friction on the worm the teeth is reduced. Another characteristic of worm manufacturing may be the need of specialized machine for gear trimming and tooth grinding of worms. The worm gear, however, may be made with the hobbing machine utilized for spur gears. But because of the various tooth shape, it isn’t possible to cut a number of gears simultaneously by stacking the gear blanks as can be done with spur gears.
The applications for worm gears include equipment boxes, angling pole reels, guitar string tuning pegs, and in which a delicate velocity adjustment by utilizing a large speed reduction is necessary. When you can rotate the worm gear by worm, it is generally worm wheel china extremely hard to rotate worm by using the worm gear. That is called the self locking feature. The self locking feature cannot always be assured and a separate method is recommended for true positive reverse prevention.
worm wheel
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