Machinist's Screw Jack
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I understand the principle of RH and LH threads working together to extend the jack, but I can't figure out how you prevent the internal set of threads from turning with the external threads. Is there a spline or keyway inside that we can't see that prevents one set of threads from rotating along with the other?
ProjectsInMetal 2 years ago
There is a spring inside connected at the top and bottom.
elcaminos 2 years ago