If the holes are deeper doesn't it means that the motor is making "more" steps and not "less" ? Is it possible that you have extra steps due to noises or bad connections PC ---> BoB ---> Gecko Drive ?
Alex On Thu, Sep 4, 2014 at 5:07 PM, Viesturs Lācis <viesturs.la...@gmail.com> wrote: > Hello! > > I have a strange situation: > Stepper motor of Z axis on a cnc router is losing it's position - > doing a series of numerous holes in material will end up with various > depths of holes. > > The strange part is: > 1) for each time, when machine is running, it will lose position only > in one direction; if holes are getting deeper, then they only get > deeper, not the other way; > 2) the direction of "drift" will change randomly as machine is > restarted and only then; simply running another g-code file will not > change the direction of "drift"; > > There is Nema23 stepper motor and Gecko stepper driver. > Motor cable is checked for loose contact, step/dir signal lines are > checked for loose contact, ballscrew and linear rails are checked for > any damage to cause extra resistance in particular direction, the > clutch between motor and ballscrew is checked not to slip. > > I am totally out of ideas, where to look. Has anyone ever experienced > anything like that? What puzzles me most is the consistency to > maintain direction of "drift" and yet randomly change, when whole > system is restarted, so any suggestions will be appreciated. > > Viesturs > > > ------------------------------------------------------------------------------ > Slashdot TV. > Video for Nerds. Stuff that matters. > http://tv.slashdot.org/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Slashdot TV. Video for Nerds. Stuff that matters. http://tv.slashdot.org/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
