On Thursday 04 September 2014 11:07:07 Viesturs Lācis did opine And Gene did reply: > 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
Can we assume you have lengthened the dirsetup and dirhold settings? I don't have any gecko's, but this sure seems to be an ongoing problem with them. From previous messages, it seems a trip to gecko for repairs fixes it, but a random direction fixed at machine boot? Thats weird, and I've no clue. 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) Genes Web page <http://geneslinuxbox.net:6309/gene> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ 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
