Worm gears are usually used when large speed reductions are needed. The decrease ratio is determined by the number of starts of the worm and quantity of tooth on the worm equipment. But worm gears possess sliding contact which is calm but will produce heat and also have relatively low transmission performance.
As for the materials for production, in general, worm is made of hard metal as the worm gear is made from relatively soft metallic such as for example aluminum bronze. This is since the number of the teeth on the worm gear is relatively high compared to worm using its number of starts being usually 1 to 4, by reducing the worm equipment hardness, the friction on the worm teeth is reduced. Another characteristic of worm manufacturing may be the need of specialized machine for gear slicing and tooth grinding of worms. The worm gear, on the other hand, may be made out of the hobbing machine used for spur gears. But due to the various tooth shape, it isn’t possible to cut many gears at once by stacking the apparatus 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 acceleration adjustment by utilizing a huge speed reduction is necessary. When you can rotate the worm equipment by worm, it is normally not possible to rotate worm utilizing the worm gear. This is called the self locking feature. The self locking feature cannot continually be assured and another method is recommended for accurate positive reverse prevention.
Also there is duplex worm gear type. When working with these, you’ll be able to adapt backlash, as when the teeth put on necessitates backlash adjustment, without needing a change in the guts distance. There aren’t too many manufacturers who can produce this kind of worm.
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