In my experience with steppers that are running on the edge (mechanically or electrically), they almost never lose steps the same amount in both directions.
Best thing I can think of doing is to put a 1" dial indicator on the questionable axis, write a test program or better yet, patch an existing one, so the axis deflects the indicator and pauses there, then goes away from the indicator and runs a lengthy program away from the indicator then have it come back and touch the indicator at the end of the run. If you do that right, you can loop the program and let it run for a while, if anything is out of wack, that will show up as a changing indicator position. You can work the home thing out also, but the dial indicator thing is is a lot more flexible IMO and works on almost all machines.. If your machine is way out of wack, be careful how you mount your indicator so it doesn't get wiped out if the machine is erractic. Dave On 4/7/2010 4:39 PM, Belli Button wrote: > Statistically you will loose as many steps going forward as you will going > backwards, sending the machine to 0,0 will not guarantee that you have not > lost and made up steps throughout your job. > > Greg > > > ----- Original Message ----- > From: "Slavko Kocjancic"<esla...@gmail.com> > To: "Enhanced Machine Controller (EMC)"<emc-users@lists.sourceforge.net> > Sent: Wednesday, April 07, 2010 5:38 PM > Subject: Re: [Emc-users] Homming error > > > >> 2010/4/7 dave<dengv...@charter.net> >> >> >>> The accuracy of that system depends on how good your home switch is. >>> >>> I've always used a dial indicator against the spindle for that type of >>> measurement. Same concept but easier since you don't have to home. >>> >>> Dave >>> > > ------------------------------------------------------------------------------ > Download Intel® Parallel Studio Eval > Try the new software tools for yourself. Speed compiling, find bugs > proactively, and fine-tune applications for parallel performance. > See why Intel Parallel Studio got high marks during beta. > http://p.sf.net/sfu/intel-sw-dev > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
