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Particular pitches and leads of the worm do not enable the worm equipment to push the worm. This is helpful when the application needs to lock the output if the software is working in the reverse direction. When the helix angle is less than 5°, the worm is self-locking. When the helix angle is greater than 10°, the worm can be pushed back. Worm and worm equipment assemblies should be mounted on vertical, non-intersecting shafts.
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