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
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