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Certain pitches and qualified prospects of the worm do not let the worm gear to push the worm. This is valuable when the software demands to lock the output if the software is working in the reverse course. When the helix angle is less than 5°, the worm is self-locking. When the helix angle is better than 10°, the worm can be pushed back. Worm and worm gear assemblies must be mounted on vertical, non-intersecting shafts.

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