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Certain pitches and leads of the worm do not let the worm gear to travel the worm. This is valuable when the application wants to lock the output if the application is managing in the opposite path. When the helix angle is considerably less than 5°, the worm is self-locking. When the helix angle is greater than 10°, the worm can be driven again. Worm and worm gear assemblies must be mounted on vertical, non-intersecting shafts.
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