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Posted by DoN. Nichols on March 14, 2006, 8:23 pm
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> > current thread is 7/16" 10tpi left hand acme thread.
> > what is the best metric equivalent for a robust cross slide thread?
> > is the acme threadform the best for a leadscrew?
> >
> I see this company offers an assortment of lead screws:
> http://www.nookindustries.com/pdf/Nook_57.pdf
>
> Looks like a 12mm x 1.5mm lead left hand would be closest to your needs.
> They have many other offerings.
I agree with the 12mm diameter.
However, I'm not at all sure that a 1.5mm lead would be very
comfortable to work with. I would suggest aiming for 1.0mm or 2.0mm, so
the dial can be calibrated in something which would add up with
subsequent turns nicely. Having to deal with 1-1/2 mm per turn would
seem to be a pain.
Of course, the real limiting factor is what standard threads you
can find taps for.
And I find myself wondering whether your machine has a metric
leadscrew. If so, you could cut your own thread for the cross-slide
leadscrew -- and you could even make your own custom tap if necessary to
produce the matching nut at a pitch which would be reasonable.
Good Luck,
DoN.
--
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---
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> > what is the best metric equivalent for a robust cross slide thread?
> > is the acme threadform the best for a leadscrew?
> >