Worm gears are usually used when large acceleration reductions are needed. The decrease ratio is determined by the number of begins of the worm and number of the teeth on the worm والعتاد. But worm gears possess sliding contact which is quiet but tends to produce heat and have relatively low transmission effectiveness.
الدقة: 
علب التروس تسمح دقة السيطرة على القيادة ، كما نسب والعتاد تحديد مقدار العجلات بدوره استجابة عجلة القيادة والتناوب. بيتمان الذراع نقل الحركة:
The applications for worm gears include equipment boxes, angling pole reels, guitar string tuning pegs, and where a delicate speed adjustment by utilizing a big speed reduction is needed. While 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 another method is preferred for true positive reverse prevention.
worm wheel
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