The first step video shows worm gear screw jack translating screw, only rotation but not translating; the second step video shows hold or fix screw, the screw will be translating.
So what is worm gear screw jack translating screw design?
Answers: A translating screw jack has a screw translates through the jack housing, When the jack screw is held to prevent rotation, the screw will move linearly through
the housing to push or pull the load. The screw may produce rotary force when lifting,
so anti-rotation
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