worm pinion gear
Worm gears are generally used when large velocity reductions are actually needed. The reduction ratio depends upon the number of starts of the worm and number of teeth on the worm equipment. But worm gears possess sliding contact which is quiet but will produce heat and have relatively low transmission performance.

As for the materials for creation, in general, worm is constructed of hard metal as the worm gear is made from relatively soft metallic such as aluminum bronze. This is as the number of tooth on the worm gear is relatively high compared to worm using its number of begins being generally 1 to 4, by reducing the worm gear hardness, the friction on the worm pearly whites is lowered. Another characteristic of worm manufacturing is the need of particular machine for gear reducing and tooth grinding of worms. The worm gear, alternatively, may be made with the hobbing machine employed for spur gears. But due to different tooth shape, it is not possible to cut some gears at once by stacking the apparatus blanks as can be done with spur gears.

The applications for worm gears include gear boxes, fishing pole reels, guitar string tuning pegs, and where a delicate speed adjustment by utilizing a big speed reduction is necessary. While you can rotate the worm equipment by worm, it is generally extremely hard to rotate worm by using the worm gear. That is called the personal locking characteristic. The self locking feature cannot continually be assured and a separate method is preferred for true positive reverse prevention.

Also there exists duplex worm gear type. When using these, you’ll be able to modify backlash, as when the teeth put on necessitates backlash adjustment, without needing a change in the center distance. There are not too many companies who can make this sort of worm.
EP’s worms and worm gears provide an effective answer for power transmission applications requiring high-ratio velocity reduction in a restricted space using right position (90°), nonintersecting shafts. When properly used, worms and worm gears supply the smoothest, quietest sort of gearing.

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