Worm gears are usually used when large acceleration reductions are needed. The decrease ratio depends upon the number of starts of the worm and number of tooth on the worm equipment. But worm gears possess sliding contact which is peaceful but tends to produce heat and have relatively low transmission effectiveness.

For the materials for creation, in general, worm is made from hard metal as the worm gear is made from relatively soft steel such as for example aluminum bronze. This is because the number of the teeth on the worm gear 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 tooth is reduced. Another feature of worm manufacturing may be the need of specific machine for gear slicing and tooth grinding of worms. The worm equipment, however, may be made with the hobbing machine utilized for spur gears. But because of the different tooth shape, it is not possible to cut a number of gears simultaneously by stacking the apparatus blanks as can be done with spur gears.

The applications for worm gears include equipment boxes, fishing pole reels, guitar string tuning pegs, and in which a delicate rate adjustment by utilizing a huge speed reduction is needed. While you can rotate the worm equipment by worm, it is normally not possible to rotate worm utilizing the worm gear. That is called the self locking feature. The self locking feature cannot always be assured and another method is recommended for accurate positive reverse prevention.

Also there is duplex worm gear type. When working with these, you’ll be able to change backlash, as when the teeth use necessitates backlash adjustment, without needing a change in the center distance. There aren’t too many producers who can produce this kind of worm.

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