Re: [CAD_CAM_EDM_DRO] re:Lathe Rack & pinion.

OK, This is a bit larger than a taig though...

I'm actually going to be up against this question myself sooner or later.
I've got a new lathe (brand new and shiny) in the garage now, which I've
bought to make the parts for my router.. This may seem a little over the
top, but I did have access to a lathe at a friends place, but he's moved,
and it's 50k's to the next nearest lathe I can use... Too much hassle, and
it was a good excuse to buy a larger lathe than my wee "cnc" job.

But I digress...

The cross on the lathe will be fine to convert, very conventional threaded
rod into a split brass or similar material nut which is "pressed" to take
out the backlash. For that axis we can just put a toothed pulley on the end
of the screw and away we go....

The carrige however has a huge lump of mechanisim on the apron which means a
second leadscrew is out, and the existing one is captive at both ends in the
castings by some magic method of assembly. Without major work I can't see
how to get a backlash free drive onto the screw. Not to mention the fact
that the threading leadscrew is a typical interrupted acme thread job for
driving the powerfeed, and the split nut has heaps of friction so probably
wouldn't do the job too well.

I think if I did mine I'd just rip out the leadscrew and most of the apron
mechanism and put a new acme screw in there, but on the lathe I looked at
the owner wants to keep all of the manual functionality.

Cheers, Chris.

* Design engineer, Assembly worker, Cleaner.
* Ohmark Electronics. PO Box 5302, Christchurch, New Zealand.
* http://www.ohmark.co.nz

----- Original Message -----
From: <ballendo@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Sunday, November 12, 2000 1:09 AM
Subject: [CAD_CAM_EDM_DRO] re:Lathe Rack & pinion.


> Chris,
>
> I've seen a Taig lathe CNC retrofit that used the rack. The stock
> taig HAS NO leadscrew. Sorry, I don't remember exactly where, it was
> on the WEB, and recently... Prob'ly bookmarked it, but I'm
> using "borrowed computer(s) just now.
>
> Hope this helps.
>
> Ballendo
>
> P.S. Call Taig and ask. The CNC stuff is done by the son. Different
> co. name. The first Taig CNC lathe(by Taig) was the son's. When I
> heard about it several years ago, I called and asked him how it
> worked with the Rack drive. He said, "My Dad put in a leadscrew for
> me"!!
>
>
> > Anyone had any experience doing a retrofit to a lathe and used the
> >Rack & pinion drive on the lathe apron instead of the lead screw?
> >I've just looked at a lathe a friend is considering retrofitting
> >after seeing my wee lathe,<snip>
>
>
>
>
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