On Friday 11 December 2015 16:42:08 Todd Zuercher wrote: > Is it just me or does the picture you linked to also show a small > offset in the x as well? (about 1/2 as much as the Z) > I didn't notice that Todd, but you are right, I'd invert the step drive and add 25% more to the dir-setup and-dir hold times.
> ----- Original Message ----- > From: "Peter C. Wallace" <p...@mesanet.com> > To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> Sent: Friday, December 11, 2015 > 4:26:55 PM > Subject: Re: [Emc-users] Z axis stepper gradually losing position > > On Fri, 11 Dec 2015, Tomas Jarmolaitis wrote: > > Date: Fri, 11 Dec 2015 23:17:59 +0200 > > From: Tomas Jarmolaitis <tonar...@neonet.lt> > > Reply-To: "Enhanced Machine Controller (EMC)" > > <emc-users@lists.sourceforge.net> > > To: "Enhanced Machine Controller (EMC)" > > <emc-users@lists.sourceforge.net> Subject: Re: [Emc-users] Z axis > > stepper gradually losing position > > > >> it takes something around 6000+ passes to complete whole circle. > >> The problem is that the Z position in the last pass is > >> approximately 0,5 mm lower than in the first. > > > > Can you measure exact amount of Z axis lowering after program run > > (with block between table and tool - maybe its wax stock > > drifting...). Is it exactly the same every time? Have you tried > > invert Z step signal? > > > > -- > > Tomas > > Doing a smaller stepover may cause more Z reversals so as you suggest, > a step polarity error (or wrong/marginal dir setup and hold times) > might cause these symptoms > > > -------------------------------------------------------------------- > >---------- _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > Peter Wallace > Mesa Electronics > > > ---------------------------------------------------------------------- >-------- _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > ---------------------------------------------------------------------- >-------- _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users 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> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
