Re: [CAD_CAM_EDM_DRO] Anti-backlash on Taig mill was:Re: Digest Number 2309

On Mon, 13 May 2002 06:06:20 -0000, you wrote:

>"The supplied nuts start with about .003" backlash, according to the
>factory, which gets worse with wear..."
>
>Yes, I have seen this number stated at their site (must have been
>Taig's site, can't find it on the MicroProto site). I would rather
>not rely on software compensation. I think many here would echo that
>sentiment.

All nuts have backlash - if they didn't the screw wouldn't turn, it's
just the amount that varies :)

The ends of the screws have a ballrace which is tensioned by the
endnut - this removes the backlash - isn't this good enough for you?

The downside to removing backlash this way is the screws get harder to
turn & the wear on the nuts & screws increases. Mine are set to allow
1 thou, I have compensation set & get repeatabilty to better than
.0005" . It's about as good as it gets without microstepping,
ballscrews etc.

I've seen a picture somewhere of a taig fitted with anti-backlash nuts
(sorry can't find it again) but I honestly don't think it's worth all
the bother. I may reconsider when I've worn the supplied nuts out but
don't expect to get any better than the half thou I have now.


Steve Blackmore
--
Pilot Consultancy Limited ***** Computer Consultants
Telephone 01744 752256 Mobile 07831 768478
Email: steve@... WWW: http://www.pilotltd.net