worm wheel

Worm gears are usually used when large velocity reductions are needed. The decrease ratio depends upon the number of worm wheel china begins of the worm and quantity of teeth on the worm gear. But worm gears possess sliding contact which is silent but will produce heat and also have relatively low transmission efficiency.
As for the materials for production, in general, worm is constructed of hard metal while the worm gear is manufactured out of relatively soft steel such as aluminum bronze. That is because the number of teeth on the worm gear is relatively high in comparison to worm with 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 is the need of specific machine for gear slicing and tooth grinding of worms. The worm equipment, however, may be made with the hobbing machine used for spur gears. But due to the various tooth shape, it isn’t possible to cut several gears at once by stacking the apparatus blanks as can be carried out with spur gears.
The applications for worm gears include gear boxes, angling pole reels, guitar string tuning pegs, and in which a delicate speed adjustment by utilizing a sizable speed reduction is needed. When you can rotate the worm equipment by worm, it is generally extremely hard to rotate worm by using the worm gear. This is called the self locking feature. The self locking feature cannot continually be assured and a separate method is recommended for accurate positive reverse prevention.

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