On Tue, 2009-12-22 at 22:38 -0700, Dustin Monroe wrote:
> Ok, I messed around with a 9v battery and adjusted the reference gain 
> and loop gain and got all three axis working without any following 
> errors. Now I have a new problem to solve, I am getting oscillation that 
> I cant get rid of and when I adjust the gain enough to solve it, i get 
> following errors. The oscillation doesn't seem bad except on the y axis. 
> the z and x feel almost like they are going back and forth between faces 
> on the encoder but the y has a pronounced vibration. Im thinking i will 
> need to rent an oscilloscope to fine tune the motors.

Opps! Short answer: if it oscillates then reduce P. Then work on FF1. 
Start by setting FF1 to 1.0. 
I think that you can do about 90% of your tuning with just those two
parameters. 

Dave
> 
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