In Detail: When a
screw jack unit is operated, the rotation of the worm shaft causes the worm gear to rotate. For rotating
screw jacks the lead
screw is fixed to the worm gear and they rotate at the same speed. As the worm gear turns, the friction forces on the
screw thread act to turn the nut also.
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A screw jack is a simple machine. It is used to lift cars or heavy automobiles. It consists of a long screw rod which passes through a threaded block B and a handle . The distance between two consecutive thread is known as pitch of screw.
