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
