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The ideal transmission choice is when higher transmission reduction is necessary. A worm gear is similar to a helical gear with a throat lower to enhance the outer diameter of the wheel. The throat allows the worm equipment to wrap fully about the threads of the worm. By slicing the threads on the worm instead than the teeth, and by changing the quantity of threads, various ratios can be accomplished with no altering the mounting arrangement. A distinctive function of worm gears and worm equipment assemblies is their capacity to prevent reverse rotation.
Certain pitches and leads of the worm do not allow the worm gear to push the worm. This is helpful when the software demands to lock the output if the software is managing in the opposite route. When the helix angle is less than 5°, the worm is self-locking. When the helix angle is increased than 10°, the worm can be pushed back again. Worm and worm gear assemblies should be mounted on vertical, non-intersecting shafts.

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