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joint 0 following error

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20 Apr 2022 18:20 #240744 by diep
joint 0 following error was created by diep
Hello!

I get each time after it starts program a joint following error.
most of time joint 0. sometimes joint 1 or joint 2.

This thing worked before like dream with linuxcnc.

What causes linuxcnc to display this error?
 
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20 Apr 2022 18:32 - 20 Apr 2022 18:34 #240746 by PCW
Replied by PCW on topic joint 0 following error
Usually this is a result of a joint setup error in the hal or ini files.

 (Often the step generator is being asked to do something it cannot
so the feedback position lags the commanded position, causing
a following error)

Can you post your hal and ini files?
Last edit: 20 Apr 2022 18:34 by PCW.

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20 Apr 2022 18:50 #240748 by diep
Replied by diep on topic joint 0 following error
Of course, should've done directly!

Let me know if you miss any files!
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20 Apr 2022 18:59 - 20 Apr 2022 18:59 #240751 by diep
Replied by diep on topic joint 0 following error
Note those who wonder how looks like underneath the cardboard - had 3d printed some wheels to CNC the machine. Was fun but wouldn't do it again.  
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Last edit: 20 Apr 2022 18:59 by diep.

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20 Apr 2022 19:29 #240752 by PCW
Replied by PCW on topic joint 0 following error
What LinuxCNC version is this?

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20 Apr 2022 19:38 #240753 by diep
Replied by diep on topic joint 0 following error
At one of photos attached at first posting it is 2.7.0 i suppose.

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20 Apr 2022 19:41 #240754 by Clive S
Replied by Clive S on topic joint 0 following error

At one of photos attached at first posting it is 2.7.0 i suppose.


RE:-
MAX_ACCELERATION = 0.3
STEPGEN_MAXACCEL = 0.3
I believe the STEPGEN_MAXACCEL = 0.3 needs to be 25% more than the MAX_ACCELERATION. on each axis

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20 Apr 2022 19:55 #240755 by PCW
Replied by PCW on topic joint 0 following error
If you have backlash compensation enabled
you must set the stepgen maxaccel value to double
the axis maxacceleration value

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20 Apr 2022 20:01 #240756 by diep
Replied by diep on topic joint 0 following error
Seems have done the job putting those higher!!

Initial speed/acceleration values of machine were really slow. Had tuned those higher past days and then also modified the stepper motor driver values!

Much thanks - would never have figured that one out!



 

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