A worm or machine can be geared with worm gear to give it higher
torque or to reduce rotational speed in the machine.
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linear distance moved by the gear(worm,screw jack) for one
rotation of the gear(worm,screw jack)
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yes you can reverse worm and gear. A worm gear can rotate the
worm, its based on the lead angle, pressure angle and co.efficient
of friction between the pairs.