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
