On Sunday 21 October 2018 09:31:34 Peter C. Wallace wrote: > >>> Greetings all; > >>> > >>> I went out in my half blind condition, found a bar of cold roll to > >>> make a different x-home switch activator for the g0704. Fired up > >>> LCNC which came up normal, but was not moveable for homing or by > >>> jogging without an instant following error. Putting a halmeter on > >>> the joint error, it was reported to be in the #-16 to #-18 range. > >>> Danged close IOW. > >>> > >>> My following error setting have been min=0.0005 and ferror 0.001 > >>> for many months. Without any problems. > >>> > >>> Tonight I find I can't jog at above .05 ipm without resetting them > >>> to min= at least .0025", and ferror at least .005", or nominally 5 > >>> times the working errors of around a month ago when I was making > >>> all those tap hats. Once the error settings exceed the backlash, > >>> it will move at close to 100 ipm in either direction of any axis. > >>> > >>> So it seems related to BACKLASH, which worst cases are > >>> GO704fast.ini:BACKLASH = 0.00190 (x) > >>> GO704fast.ini:BACKLASH = 0.000950(y) > >>> GO704fast.ini:BACKLASH = 0.00320 (z) > >>> > >>> Has anything been changed in that area of the code recently? > >>> > >>> Thanks everybody for clues to check next. > >>> > >>> -- > >>> 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> > >> > >> The PID component changed a few months ago, so if your stepgen uses > >> the PID component and you updated the LinuxCNC version recently, > >> you may need to make some minor changes in the hal file > >> (disconnecting the pid.N.command-deriv pins) > > > > Done, Peter but not tested as motor power is hand controlled on that > > machine. As it is on the other 2, only the pi can power things up > > via an ssh login. > > > > Thanks Peter. Is there a new man page? I think I may be looking at > > the old one. > > The PID manual page is correct > > (it always was, its the PID component that has been patched to match > the documented behaviour) > Ah so, said the half-blind guy while calling up a copy of geany to put my following errors back to the previous normal. :)
And since the feedback is from the stepgens, not a motor encoder, it happily runs at over 100 ipm with the former error settings. Without motor power right now. :) However, Andy said he pushed a function key fix, but I didn't get it with an update just now. I assume the buildbot hasn't run yet. Tomorrow maybe? Thanks Peter. -- 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> _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
