Another thing ........ check the ferror compared to the command . alex
On Thu, Jun 20, 2013 at 5:10 PM, alex chiosso <[email protected]> wrote: > Are you able to do the axis homing ? > If yes can you perform an MDI movement to a position G01 F... X .... > check if the gantry axis position read are the same and check if you have > mechanical misalignment between them ? > So repeat the movement to another position and re-check ? > If you have noise encoder you should also "loose" pulses somewere. > If you don't loose pulses maibe something related to the mechanical parts > could be. > > bigalex > > > > On Thu, Jun 20, 2013 at 4:57 PM, Jon Elson <[email protected]> wrote: > >> Viesturs Lācis 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; >> > >> Are these impossible accelerations or what is consistent with the >> motor's motion? >> Impossible velocity spikes from an encoder clearly indicate either a >> defective >> encoder, noise or defect in the encoder cable, or a defect in the encoder >> counter board. It would be expected the home position would drift after >> making moves that cause the noise. Noise or loss of position when going >> only one direction is typical of dirt on or damage to the encoder disc >> or analyzer grating. >> >> Jon >> >> >> ------------------------------------------------------------------------------ >> 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
