Motor tuning issues

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bencarlson
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Motor tuning issues

Post by bencarlson »

My machine is a Milltronics Partner 00 knee mill. I've changed the control to the All-in-one DC. I'm having a hard time getting the z-axis to be "stable" - it keeps tripping the e-stop circuit.

I thought maybe tuning it would solve it, but I'm unable to get the program to run very long. And suggestions are appreciated! I'm stumped!

I added a video showing what I'm doing and what's happening.

Thanks!!

-Ben


tblough
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Re: Motor tuning issues

Post by tblough »

What error messages are displayed in the message window? Please see this post viewtopic.php?f=64&t=383 so we have the information to help you. Without even seeing how the axis is mechanically set up and just watching buttons being pressed, I would guess your axis is binding in the up direction.
Cheers,

Tom
Confidence is the feeling you have before you fully understand the situation.
I have CDO. It's like OCD, but the letters are where they should be.
bencarlson
Posts: 33
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Re: Motor tuning issues

Post by bencarlson »

I'm sorry about that! Here's the info requested. I reset my PID for the z-axis back to the defaults before generating the report, but it's still not working properly.

-Ben
Attachments
report_0307181920_2020-09-18_07-47-45.zip
(5.76 MiB) Downloaded 146 times
bencarlson
Posts: 33
Joined: Fri Sep 14, 2018 3:58 pm
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CNC Control System Serial Number: unknown as of yet
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Location: Kearney, NE USA

Re: Motor tuning issues

Post by bencarlson »

Here are some photos of the machine. The z-axis is not just the quill - it moves the whole head of the machine. I'm wondering if the weight has something to do with why it's only having issues in Z+ direction?

Here's the machine.
PXL_20200918_125049853.jpg
Here's a view of the back of the z-axis, showing the linear rails and ballscrew.
PXL_20200918_125107236.jpg
Here's a piece I was able to face the other day, when I first got the machine moving. It kicked out the z-axis a bunch, but I got it to run.
PXL_20200918_125140743.jpg
-Ben
tblough
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Re: Motor tuning issues

Post by tblough »

If there's no counterbalance on the head, then that is most probably the issue. You can try to adjust the axis acceleration down and see if that helps, but that much weight definitely needs to be counterbalanced.
Cheers,

Tom
Confidence is the feeling you have before you fully understand the situation.
I have CDO. It's like OCD, but the letters are where they should be.
martyscncgarage
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Re: Motor tuning issues

Post by martyscncgarage »

Interesting, I had never seen a Milltronics mill with that configuration.
Since Milltronics built it that way, it probably has a very large Servo motor on it and its probably geared low.
You never posted motor label information, that would be handy.

When you "TUNE" using the Centroid utility, for the most part, all the control is doing is setting acceleration.

I suggest if you have good wifi to the machine, you contact Marc Leonard (CNCSNW) via PM and ask him to see if he could remote in to tune your servos.
Of course he has a fee to do this. Its what I would do.

Marty
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
Mesa, AZ
bencarlson
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Re: Motor tuning issues

Post by bencarlson »

Oh interesting! I didn't think about the acceleration rate. I'll look into that - if I can't get it in the next hour or so, I'll reach out to Marc - thanks Marty!!

On the counter balance, I've not modified anything, so I believe it should work as-is (mechanically anyways). Here's the data plate on my z-axis motor in case anyone wants to see.
PXL_20200918_155608955.jpg
PXL_20200918_155545269.jpg
-Ben
bencarlson
Posts: 33
Joined: Fri Sep 14, 2018 3:58 pm
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DC3IOB: No
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Location: Kearney, NE USA

Re: Motor tuning issues

Post by bencarlson »

Here's another video of trying to adjust acceleration - you can see it works decent when I have the feed rate at 20% but even at 50% it kicks out.

tblough
Posts: 3072
Joined: Tue Mar 22, 2016 10:03 am
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100327
102696
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DC3IOB: No
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Re: Motor tuning issues

Post by tblough »

And what happens when you slow the acceleration down to .1 or .2?
Cheers,

Tom
Confidence is the feeling you have before you fully understand the situation.
I have CDO. It's like OCD, but the letters are where they should be.
bencarlson
Posts: 33
Joined: Fri Sep 14, 2018 3:58 pm
Acorn CNC Controller: No
Allin1DC CNC Controller: Yes
Oak CNC controller: No
CNC Control System Serial Number: unknown as of yet
DC3IOB: No
CNC12: Yes
CNC11: Yes
CPU10 or CPU7: No
Location: Kearney, NE USA

Re: Motor tuning issues

Post by bencarlson »

From the documentation, it says that the lower the number (i.e. .1) the faster the acceleration...

"6.8 MANUALLY TUNE THE ACCELERATION
Acceleration is the time for the axis to reach maximum velocity. An acceleration rate of 0.1 second is very fast, where an
acceleration rate of 1.0 will be considered very slow. CNC12 defaults to an acceleration of 0.5."

So, I didn't try anything below the default .5 - from what you said " ... slow the acceleration down to .1 or .2" - is the documentation wrong?

Thanks!

-Ben
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