On Tue, 23 Sep 2003 09:49:22 GMT, Anthony
wrote:

Gunner wrote in
:


I removed the table tonight..and the screw is bent in two places, both
of which should be easy to straighten. Unfortunately......the bends
are on the wrong side of the nut, which is bolted to the top of the
knee, under the table. And the screw will turn, but only to the first
bend. Unfortunately again..it only will screw out in one direction, as
there is a flange machined into one end of the screw, so the
direction it comes out..is the one blocked by the bend.

The nut is held in with a couple of large screws, both directly under
the screw. The screw has to come out to get to the nut fasteners..and
it wont come out because of the bend...sigh. Now I have to figure out
a way to straighten it while its still in the machine, though fully
exposed. The nut is a long cast iron "tube" tapped inside for the
thread

I suppose I could take a die grinder and cut away that flange that
holds the screw from going the other direction..but it aint gonna be
pretty....

This is gonna be a head scratcher..

125 thou per revolution, so its 8 TPI by 7/8", if anyone happens to
have 4' of this kicking around...

Gunner


"Anyone who cannot cope with firearms is not fully human. At best he
is a tolerable subhuman who has learned to wear shoes, bathe and not
make messes in the house."
With appologies to RAH..



Gunner,
Try McMaster Carr, they care ACME screws in standard lengths/sizes, and
are relatively inexpensive.


--
Anthony

MSC has them too, but they are rolled threads. I would think a fellow
could cut an acme thread more accurately in any good lathe. I've made
many of them of 12L14 at the Lumber mill I used to work in. Of course
if the lead screw is worn out you get a sloppy lead thread in your
screw. Cutting acme threads with a follow rest is a bit like juggling
sometimes until one gets used to it.