Worm gears are usually used when large rate reductions are needed. The reduction 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 noiseless but will produce heat and also 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 steel such as aluminum bronze. That is since the number of teeth on the worm equipment is relatively high compared to worm using its number of starts being generally 1 to 4, by reducing the worm gear hardness, the friction on the worm teeth is reduced. Another characteristic of worm manufacturing is the need of specialized machine for gear reducing and tooth grinding of worms. The worm gear, however, may be made out of the hobbing machine utilized for spur gears. But because of the different tooth shape, it is not possible to cut many gears simultaneously by stacking the apparatus blanks as can be done with spur gears.
The applications for worm gears include gear boxes, angling pole reels, guitar string tuning pegs, and where a delicate speed adjustment by utilizing a huge speed reduction is necessary. While you can rotate the worm equipment by worm, it is normally not possible to rotate worm by using the worm gear. That is called the personal locking feature. The self locking feature cannot continually be assured and a separate method is preferred for true positive reverse prevention.
Also there is duplex worm gear type. When working with these, it is possible to change backlash, as when one’s teeth put on necessitates backlash adjustment, without requiring a change in the guts distance. There are not too many manufacturers who can produce this type of worm.
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