Worm gears are usually used when large quickness reductions are needed. The decrease ratio is determined by the number of begins of the worm and amount of teeth on the worm gear. But worm gears possess sliding get in touch with which is noiseless but will produce heat and have relatively low transmission effectiveness.
For the materials for production, in general, worm is made from hard metal while the worm gear is manufactured out of relatively soft steel such as aluminum bronze. That is since the number of the teeth on the worm gear is relatively high compared to worm using its number of starts being usually 1 to 4, 
by reducing the worm equipment hardness, the friction on the worm tooth is reduced. Another feature 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 is not possible to cut a number of gears simultaneously by stacking the apparatus blanks as can be carried out with spur gears.
The worm wheel applications for worm gears include gear boxes, fishing pole reels, guitar string tuning pegs, and where a delicate speed adjustment by utilizing a big speed reduction is necessary. When you can rotate the worm equipment by worm, it is generally not possible to rotate worm utilizing the worm gear. This is called the self locking feature. The self locking feature cannot always be assured and a separate method is preferred for true positive reverse prevention.
worm wheel
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