skunkworks wrote: I played with external offset too - It was initially designed for a jog while paused solution. The offset inputs are counts. (not a big deal but odd when trying to do this type of thing) I stripped it down and tried to do a simple pid voltage loop - I could not tune it to save my life. (granted - it could be me) It has been a while - but I was thinking it was the simple tp that was integrated into it.
I had a good look at the eoffset_pid component again today. The counts are calibrated with a scale which defaults to. 0.00254 mm per count so I can't really see why counts rather than a distance offset should make any difference. But I am way out of my depth. As I wrote this, I wondered if a 1 khz servo thread is just too fast. Anyway, the OCD side of me wants to change the scale to 0.001mm because I don't do imperial units (or in this case derivatives thereof) so we'll see what happens. The other idea I just had was to skip some servo thread cycles before processing adjustments.
Anyway, my new plasma consumables arrived so I have some ceramic shields again.
Also my new misalignment shaft coupling arrived late this afternoon. (Shown here partially separated).
This is 20mm in diameter. I have to bore it out to suit my shafts. I also looked at a 30mm diameter coupling that could handle 15 Nm
of torque but after some research, it seemed best to not oversize the coupling. This one is good for 5 Nm backlash free and the acceleration forces is calculated at about 3.3 Nm so we have a 1.5x safety factor which seems adequate.
Anyway, hopefully tomorrow we will be backlash free and ready for further testing.
