Worm gears are usually used when large acceleration reductions are needed. The decrease ratio is determined by the number of begins of the worm and number of the teeth on the worm gear. But worm gears possess sliding contact which is quiet but tends to produce heat and have relatively low transmission effectiveness.
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. That is because the number of tooth on the worm gear is relatively high 
compared to worm using its number of begins being generally 1 to 4, by reducing the worm gear hardness, the friction on the worm teeth is worm wheel china reduced. Another characteristic of worm manufacturing is the need of specialized machine for gear reducing and tooth grinding of worms. The worm gear, on the other hand, may be made with the hobbing machine utilized for spur gears. But due to the different tooth shape, it is not possible to cut several 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 where a delicate speed adjustment by utilizing a big speed reduction is needed. While you can rotate the worm gear by worm, it is generally not possible to rotate worm by using the worm gear. That is called the personal locking feature. The self locking feature cannot always be assured and another method is preferred for true positive reverse prevention.
worm wheel
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