worm wheel

Worm gears are usually used when large quickness reductions are needed. The reduction ratio depends upon the number of starts of the worm and number of the teeth on the worm equipment. But worm gears have sliding get in touch with which is tranquil but tends to produce heat and have relatively low transmission performance.
As for the materials for creation, in general, worm is made from hard metal while the worm gear is made from relatively soft metallic such as aluminum bronze. That is since the number of the 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 worm wheel china feature of worm manufacturing is the need of specific machine for gear trimming and tooth grinding of worms. The worm gear, however, may be made out of the hobbing machine used for spur gears. But due to the different tooth shape, it is not possible to cut many gears simultaneously by stacking the gear blanks as can be done with spur gears.
The applications for worm gears include gear boxes, fishing pole reels, guitar string tuning pegs, and in which a delicate swiftness adjustment by utilizing a huge speed reduction is needed. While you can rotate the worm gear by worm, it is usually not possible to rotate worm utilizing the worm gear. That is called the self locking feature. The self locking feature cannot continually be assured and another method is preferred for true positive reverse prevention.