Centroid Community CNC Support Forum

CentroidFrog wrote: ↑Mon Apr 21, 2025 9:58 am Got any updates for us?
Were you able to get the Acceleration values figured out?
It could be worth doing an Autotune and letting CNC12 set the values for you and then adjust them from there.
Section 6.7 of the Allin1DC manual touches on this very briefly.
There's also more info on this in the mill operator manual on page 383/384 section 15.5.2:
https://www.centroidcnc.com/centroid_di ... f#page=384

No updates. I was waiting on CNC Kieth to look at the report I submitted.

i lost track of the question, what is the issue? these are centroid dc motors, configure them as the manual says.
are you having tuning issues? then describe the issue please.
you can arrange a 1 one 1 remote tuning session with a centroid tech if you need help

cnckeith wrote: ↑Tue Apr 29, 2025 2:12 pm i lost track of the question, what is the issue? these are centroid dc motors, configure them as the manual says.
are you having tuning issues? then describe the issue please.
you can arrange a 1 one 1 remote tuning session with a centroid tech if you need help

I was having trouble with the acceleration test and you asked for a report.

routebot wrote: ↑Tue Apr 29, 2025 9:56 pm

cnckeith wrote: ↑Tue Apr 29, 2025 2:12 pm i lost track of the question, what is the issue? these are centroid dc motors, configure them as the manual says.
are you having tuning issues? then describe the issue please.
you can arrange a 1 one 1 remote tuning session with a centroid tech if you need help

I was having trouble with the acceleration test and you asked for a report.

Yep, got the report looked at. It looks like you have the right PID parameters. What is the problem you're having?

cnckeith wrote: ↑Wed Apr 30, 2025 12:33 am

routebot wrote: ↑Tue Apr 29, 2025 9:56 pm

cnckeith wrote: ↑Tue Apr 29, 2025 2:12 pm i lost track of the question, what is the issue? these are centroid dc motors, configure them as the manual says.
are you having tuning issues? then describe the issue please.
you can arrange a 1 one 1 remote tuning session with a centroid tech if you need help

I was having trouble with the acceleration test and you asked for a report.

Yep, got the report looked at. It looks like you have the right PID parameters. What is the problem you're having?

I was having trouble with the acceleration test. It was not getting up to speed fast enough.

ok. are we talking about the Accel time?
i see you have it at .2800 for the X axis. that is fast for a knee mill. i would run it at .5 for starters and then maybe reduce it to .375
also reduce the Max rates for X and Y axis to 400 ipm and 200 for the Z axis. these are common rates to run a knee mill at.

I was finally able to get the acceleration test done using Auto Tune and correcting the feed rate on the program.. It appears to be good now.

Testing video:

On to the fine DRO calibration. Now I'm getting encoder errors when I home the mill. Every step I take there's another problem. Thoughts? Sometimes it's the Z and sometimes the X axis.

Those messages are normal for the first time you home a new installation. Just answer "Y" to accept the new home position.

If you continue to get "home differs by __ counts" warning messages after you accept it the first time, then either your home switches are inconsistent (sticking or moving around); or something is slipping in your drive train.

I have finally made it to the final system test! However, it failed. With the encoder errors I expected it would probably fail. Here's the test info and a video. How do I move forward with this?

-------------------------------------------
Starting system test
-------------------------------------------
Version Information
$Id: systest.cnc,v 1.1.1.1 2006/01/05 14:30:21 kdennison Exp $
;;;;;;;;;;;;;;;;;;;;;;;
System is NOT configured for ATC

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Checking travel limits and home set
Travel limits set and machine is homed.

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Starting home switch testing
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Homing axis 1 minus
1 / 8 turn distance is 0.0250
7 / 8 turn distance is 0.1748
full turn distance is 0.1997
Off switch| error | home | error | differnce
-0.0572 0.0000 -0.0000 0.0000 0.0572
Off switch Max Min Difference
-0.0572 -0.0572 0.0000
home posiiton Max Min Difference
-0.0000 -0.0000 0.0000
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Homing axis 1 plus
1 / 8 turn distance is 0.0250
7 / 8 turn distance is 0.1748
full turn distance is 0.1997
Off switch| error | home | error | differnce
31.2113 0.0000 31.1568 0.0000 0.0546
Off switch Max Min Difference
31.2113 31.2113 0.0000
home posiiton Max Min Difference
31.1568 31.1568 0.0000
Axis has both minus and plus home switches
-Distance between home positions is 31.1568
-Distance between travel limits is 31.1315
-Difference between distances is 0.0253
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Homing axis 2 minus
1 / 8 turn distance is 0.0250
7 / 8 turn distance is 0.1750
full turn distance is 0.2000
Off switch| error | home | error | differnce
-15.2507 0.0000 -15.1988 0.0000 0.0519
Off switch Max Min Difference
-15.2507 -15.2507 0.0000
home posiiton Max Min Difference
-15.1988 -15.1988 0.0000
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Homing axis 2 plus
1 / 8 turn distance is 0.0250
7 / 8 turn distance is 0.1750
full turn distance is 0.2000
Off switch| error | home | error | differnce
0.1710 0.0000 0.0000 0.0000 0.1709
Off switch Max Min Difference
0.1710 0.1710 0.0000
home posiiton Max Min Difference
0.0000 0.0000 0.0000
Axis has both minus and plus home switches
-Distance between home positions is 15.1989
-Distance between travel limits is 15.1693
-Difference between distances is 0.0296
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Homing axis 3 minus
1 / 8 turn distance is 0.0148
7 / 8 turn distance is 0.1033
full turn distance is 0.1180
Off switch| error | home | error | differnce
-3.8888 0.0000 -3.7779 0.0000 0.1109
Off switch Max Min Difference
-3.8888 -3.8888 0.0000
home posiiton Max Min Difference
-3.7779 -3.7779 0.0000
*** FAILURE Home position too close to encoder index pulse
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Homing axis 3 plus
1 / 8 turn distance is 0.0148
7 / 8 turn distance is 0.1033
full turn distance is 0.1180
Off switch| error | home | error | differnce
0.0199 0.0000 0.0000 0.0000 0.0199
Off switch Max Min Difference
0.0199 0.0199 0.0000
home posiiton Max Min Difference
0.0000 0.0000 0.0000
Axis has both minus and plus home switches
-Distance between home positions is 3.7779
-Distance between travel limits is 3.8056
-Difference between distances is -0.0277
*** FAILURE Travel limits set incorrectly
Finished testing home/limit switches
*** FAILED SYSTEM TEST ***


Video:

Since you will probably never set up the machine to home Z in the minus direction, you could just go to the Machine Configuration -> Motor Parameters table, and change the Z minus home input from 5 (or 6?) to zero.

Leave the non-zero switch input number in place as the minus limit; just zero out the minus home input number.

That should solve both of the issues that the System Test flagged.


Alternately, adjust the Z minus limit trip stop so that it trips the switch about 0.050" sooner (higher); and also go to the Machine Configuration -> Jog Parameters table and change your Z minus travel limit from -3.8056 to -3.7700