Hi Viestus. Another thing .... Do you see a change behavior if you increase the speed movement ?
bigalex On Thu, Jun 20, 2013 at 3:52 PM, alex chiosso <[email protected]> wrote: > Hi Viestus. > The fact that you reduced the P gain from 400 to 15 it's strange (it is a > big change). > Do you see any change after P gain modification (the noise frequency > change) ? > How is the mechanical coupling made ? > Is there any backlash on the coupling ? > If the motion is made by ball and nuts screw how is the machanical status > of it? > Maybe due to a not perfect mechanical alignement or electronic tuning > between the two sides of the gantry > on the "bad" side there is a machanical stress that "damage" the screw. > If I'm saying something stupid excuse me :-) . > > bigalex > > > > > On Thu, Jun 20, 2013 at 3:34 PM, Viesturs Lācis > <[email protected]>wrote: > >> Hello! >> >> I have spent hours in plural trying to figure out, what is wrong and this >> is driving me nuts. >> Here is a video with that motor in action (I was jogging it back and >> forth): >> http://www.youtube.com/watch?v=RA4mdp1rYfs >> >> That noise starts at 0:14. >> 1) it is there only when moving to the right; >> 2) it is the only motor doing such a noise; it is a gantry machine, motor >> on the other side and the motor that sits on the gantry are fine; >> 3) PID tuning of these motors was done 2 years ago, problem started few >> weeks ago (according to client); I retuned PID today, difference in >> parameter values can be expressed in orders of magnitude (P was 400, now >> it >> is 15 etc.) >> 4) I watched encoder velocity pin in HalScope, it is fluctuating, so that >> comes form motor; >> >> Is it some mechanical problem? Is that encoder? I would appreciate any >> tips, where to look. >> >> Thanks in advance! >> >> -- >> Viesturs >> >> If you can't fix it, you don't own it. >> http://www.ifixit.com/Manifesto >> >> ------------------------------------------------------------------------------ >> This SF.net email is sponsored by Windows: >> >> Build for Windows Store. >> >> http://p.sf.net/sfu/windows-dev2dev >> _______________________________________________ >> Emc-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > > ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
