On May 21, 2012, at 10:36 AM, Jon Elson wrote:
Jeshua Lacock wrote:
Putting these numbers in immediately made the drive stable - even in closed
loop which is now what I am tuning.
I was able to get the P up to 150. I can add some D, but it seems that it
only makes the drive more jittery
Jeshua Lacock wrote:
It felt like I wanted to get P set as high as I could. Is that correct? Or as
long as P is high enough to command the machine to move is that adequate?
You want the P as high as you can get it while still having stable
response. Low P will
lead to sloppy positioning,
On May 20, 2012, at 7:08 PM, Jon Elson wrote:
Jeshua Lacock wrote:
Actually, I really have only been using open-loop mode.
Since we had confusion here, open loop means LinuxCNC does not see movement
when you move the motors.
Hi Jon,
That is correct.
But as soon as I try closed loop
On 21 May 2012 09:26, Jeshua Lacock jes...@3dtopo.com wrote:
Can you tell me what exactly is the goal? Do I want the P as high was
possible while keeping it stable?
The goal is the best achievable stable servo response. The PID terms
need to be whatever achieves this, but the target is very
Jeshua Lacock wrote:
Putting these numbers in immediately made the drive stable - even in closed
loop which is now what I am tuning.
I was able to get the P up to 150. I can add some D, but it seems that it
only makes the drive more jittery without decreasing the error.
Well, then lower
Jeshua Lacock wrote:
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
On May 20, 2012, at 1:56 PM, Jon Elson wrote:
Jeshua Lacock wrote:
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.
Jeshua Lacock wrote:
Actually, I really have only been using open-loop mode.
Since we had confusion here, open loop means LinuxCNC does not see movement
when you move the motors.
I am a little confused however because changing the PID settings still seems
to affect the drive.
Yes, even
Greetings,
I seem to have the damping turned all the way up on my Gecko 320, but it is
still underdamped.
Is it possible to increase damping with the PID settings (I am using the Pico
Systems USC board)?
Would gearing down my drive further help with damping if I it is not possible
to
Jeshua Lacock wrote:
Greetings,
I seem to have the damping turned all the way up on my Gecko 320, but it is
still underdamped.
Is it possible to increase damping with the PID settings (I am using the Pico
Systems USC board)?
Would gearing down my drive further help with damping if I it
On May 19, 2012, at 6:55 PM, Jon Elson wrote:
I seem to have the damping turned all the way up on my Gecko 320, but it is
still underdamped.
Is it possible to increase damping with the PID settings (I am using the
Pico Systems USC board)?
Would gearing down my drive further help with
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
On May 19, 2012, at 11:34 PM, Steve Stallings wrote:
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
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