<snip>
> Hi Jon,
> 
> Well lets just say the only thing that I am sure about is the 
> drive is under-damped.
> 
> ;)
> 
> Tuning is proving to be insanely difficult for me, I guess 
> mostly because I don't really have much of a clue what I am 
> doing. It is also kind of scary because if I turn a POT on 
> the Gecko just a tad in the wrong way the drive violently 
> rattles the whole table.
> 
> When it was just the Gecko, that was something I had a grip 
> on. But now it is a combination of the Gecko and the PID settings.
> 
> It may be that I am just trying to accelerate the drive 
> faster than the system can adequately damp it. This gantry is 
> probably close to 200 pounds, and I just don't know how fast 
> I can expect to be able to accelerate it.
> 
> Does gearing a drive help with this? I seems in my mind it 
> should. Gearing it down further would give me increased 
> torque and resolution so seems like a win win.
> 
> In the meantime, I will try turning the gain POT down and the D up?
> 
> 
> Best,
> 
> Jeshua Lacock

Is this a G320 or a G320X? If it is a G320X there are internal
DIP switches that can be used to reduce the torque gain which
might help with stability.

Do your encoders have selectable resolution? A lower resolution
might also help tame the excessive response.

Regards,
Steve Stallings



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