Worm gears are often used when large rate reductions are needed. The decrease ratio is determined by the number of begins of the worm and amount of the teeth on the worm gear. But worm gears possess worm wheel china sliding contact which is tranquil but tends to produce heat and have relatively low transmission efficiency.
As for the materials for creation, in general, worm is made of hard metal while the worm gear is made from relatively soft metallic such as for example aluminum bronze. That is because the number of tooth on the worm gear is relatively high compared to worm using its number of begins being usually 1 to 4, by reducing the worm gear hardness, the friction on the worm the teeth is reduced. Another feature of worm manufacturing may be the need of specialized machine for gear reducing and tooth grinding of worms. The worm equipment, on the other hand, may be made with 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 carried out with spur gears.
The applications for worm gears include gear boxes, fishing pole reels, guitar string tuning pegs, and where a delicate quickness adjustment by utilizing a big speed reduction is needed. When you can rotate the worm gear by worm, it is generally not possible to rotate worm by using the worm gear. That is called the personal locking feature. The self locking feature cannot always be assured and a separate method is preferred for true positive reverse prevention.