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The ideal transmission choice is when higher transmission reduction is required. A worm gear is similar to a helical gear with a throat lower to improve the outer diameter of the wheel. The throat allows the worm equipment to wrap entirely about the threads of the worm. By cutting the threads on the worm rather than the teeth, and by changing the variety of threads, various ratios can be attained without modifying the mounting arrangement. A distinctive characteristic of worm gears and worm gear assemblies is their ability to avert reverse rotation.
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