Worm gears are usually used when large quickness reductions are needed. The reduction ratio is determined by the number of starts of the worm and number of the teeth on the worm equipment. But worm gears have sliding contact which is noiseless but will produce heat and also have relatively low transmission performance.
As for the materials for creation, in general, worm is made of hard metal while the worm gear is manufactured out of relatively soft metallic such as for example aluminum bronze. That is since the number of the teeth on the worm gear is relatively high compared to worm with its number of starts being usually 1 to 4, by reducing the worm gear hardness, the friction on the worm tooth is reduced. Another feature of worm manufacturing may be the need of specific machine for gear cutting and tooth grinding of worms. The worm gear, on the other hand, may be made out of the hobbing machine utilized for spur gears. But due to the various tooth shape, it is not possible to cut a number of gears simultaneously by stacking the gear blanks as can be done with spur gears.
The applications for worm gears include equipment boxes, angling pole reels, guitar string tuning pegs, and where a delicate quickness adjustment by utilizing a large speed reduction is necessary. When you can rotate the worm gear by worm, it is usually extremely hard to rotate worm by using the worm gear. This is called the self locking feature. The self locking feature cannot always be assured and another method is preferred for accurate positive reverse prevention.
Also there exists duplex worm gear type. When using these, you’ll be able to adapt backlash, as when the teeth put on necessitates backlash adjustment, without needing a change in the center distance. There aren’t too many manufacturers who can generate this type of worm.
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