Threaded rod is not the same thing as a lead screw. Threaded
rod is intended to be used for a fixed bolt/nut application, not
as a linear drive. Bolts and nuts are designed to have high
friction under load; lead screws are designed to have low friction
under load. Lead screws are usually square or Acme cut, and are often
used with ball nuts to reduce friction.
For a small lead screw, a bolt-type thread may work, but you're
talking about half-inch rod, which would imply a load upwards of
Here's some reasonably priced 1/2" Acme threaded rod:
They also sell the matching nut.
Also take a look at the screw jacks on this page:
There's one with a travel of 6.25", with the gear drive for
connection to a motor. All for $10.95 each.
Hmmmm - the only ones I have seen at Home Depot have 10-24 thread or similar. I
haven't looked at Lowes yet - they have the best
selection of odd hardware down in this area ( Atlanta ).
I did notice a concrete drill bit that was cheap that might work, though. anyone
tried using one of those ? I would just use some
of that ShapeLock plastic to form a nut if I used one of those.
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