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Particular pitches and leads of the worm do not allow the worm equipment to travel the worm. This is useful when the software needs to lock the output if the software is running in the reverse path. 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 again. Worm and worm gear assemblies need to be mounted on vertical, non-intersecting shafts.