Worm gears are usually used when large speed reductions are needed. The reduction ratio is determined by the number of begins of the worm and quantity of the teeth on the worm equipment. But worm gears possess sliding contact which is quiet but will produce heat and have relatively low transmission effectiveness.

For the materials for production, in general, worm is made from hard metal while the worm gear is made from relatively soft metallic such as for example aluminum bronze. This is since the number of tooth on the worm equipment is relatively high in comparison to worm using 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 with the hobbing machine used for spur gears. But due to the various tooth shape, it is not possible to cut many gears simultaneously by stacking the apparatus 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 acceleration adjustment by utilizing a large speed reduction is needed. While you can rotate the worm equipment by worm, it is usually extremely hard to rotate worm by using the worm gear. That is called the personal locking feature. The self locking feature cannot continually be assured and another method is recommended for true positive reverse prevention.

Also there is duplex worm gear type. When working with these, you’ll be able to modify backlash, as when the teeth use necessitates backlash adjustment, without requiring a change in the center distance. There aren’t too many producers who can produce this kind of worm.

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