Chris Radek escribió: > On Mon, Feb 02, 2009 at 02:02:51AM +0100, Arnold Riter CNC wrote: > >> The threading are incorrect, so I've been looking to what can be wrong, >> and I find that the "motion.spindle-revs" not correspond with the reality. >> When there is only 1 to 5 revolution the value is almost correct, but >> when the spindle rotated more than 50 revolution the gaps between the >> read value and real is increased. >> > > When I had this problem, it was a set screw on the encoder shaft > that I forgot to tighten. It would almost track, but a bit of error > would build up after many turns. > > If your encoder is differential, make sure the 7i33 is jumpered for > differential mode. If it's not, make sure the 7i33 ISN'T jumpered for > differential mode. Also check your grounds and as Jeff says, check > the mechanical stuff, even if you already checked it once! > > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by: > SourcForge Community > SourceForge wants to tell your story. > http://p.sf.net/sfu/sf-spreadtheword > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > >
Thanks Jeff, Chris, and everybody. Yes you were right, it was noise present in the encoder-spindle line. I tried to solve it by making sure all grounds were right, but the problem persisted, so I isolated the encoder-spindle from the lathe chassis, and the problem was over Now the mounting plate of the encoder has been done from plastic, and there is a rubber tooth belt and pulley between spindle and encoder, so there is no common ground between lathe and encoder. I'm making very fine multi-pass thread now. Thanks again! Arnoldo ------------------------------------------------------------------------------ Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) software. With Adobe AIR, Ajax developers can use existing skills and code to build responsive, highly engaging applications that combine the power of local resources and data with the reach of the web. Download the Adobe AIR SDK and Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
