worm wheel

Worm gears are often used when large quickness reductions are needed. The decrease ratio depends upon the number of begins of the worm and amount of the teeth on the worm gear. But worm gears possess sliding contact which is silent but tends to produce heat and have relatively low transmission performance.
For the materials for production, in general, worm is made of hard metal while the worm gear is manufactured out of relatively soft metallic such as aluminum bronze. This is because the number of teeth on the worm gear is relatively high in comparison to worm with its number of starts being generally 1 to 4, by reducing the worm equipment hardness, the friction on the worm the teeth is reduced. Another characteristic of worm manufacturing may be the need of specific 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 due to the different tooth shape, it isn’t possible to cut several gears simultaneously by stacking the gear 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 sizable speed reduction is needed. While you can rotate the worm gear by worm, it is usually extremely hard to rotate worm utilizing the worm gear. This is called the self locking feature. The self locking feature worm wheel china cannot continually be assured and another method is preferred for accurate positive reverse prevention.