I had X issues - observable on a long job of engraving. Job came out
slightly not square!

5I25 to a Gecko G540 - as mentioned above, inverting the polarity of the
signal(s) fixed it - I was pushing the Gecko G540 slightly too fast. Only
one input of the XYZA showed the symptom.

The machine has been rock stable since.

I'd have to go through my backup files and/or notes to see exactly what
signal was inverted.

May I suggest doubling pulse lengths, and seeing if that helps? Give the
drivers time to settle into a known state?

Good luck - John.

On Fri, Dec 11, 2015 at 8:47 PM, Gene Heskett <ghesk...@wdtv.com> wrote:

> On Friday 11 December 2015 18:21:20 andy pugh wrote:
>
> > On 11 December 2015 at 22:41, Marcus Bowman
> >
> > <marcus.bow...@visible.eclipse.co.uk> wrote:
> > > The tiniest error in your (software) backlash settings accumulate
> >
> > If it does, that's a bug.
> >
> > It is more likely to be that the backlash comp moves are at max speed.
> > If max speed is over-optimistic, then that can case problems.
>
> Does that not depend on the Linuxcnc version? I haven't heard it trying
> to do a backlash move at knock it out of the park speeds in quite a
> while.  I had assumed (there's that word again) that a backlash move was
> now being made not only subject to the max vel, but also, subject to the
> max-accel settings which it didn't do 2-3 years ago.
>
> Or am I dreaming?  ChangeLogs readable by us dummies might be helpful?
>
>
> Cheers, Gene Heskett
> --
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> Some mill pix are at:
> Genes Web page <http://geneslinuxbox.net:6309/gene/GO704-pix>
>
>
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