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NOT SITTING AT ABSOLUTE POSITION AFTER UPGRADE FROM 2.7 to 2.8
7 years 11 months ago #120534
by COlger81
After upgrading to Master from 2.7, my mill does not sit at absolute zero. After homing sequence, each axis sits roughly .0003" to .0005" from absolute machine zero. Prior to upgrade, i did not have this issue. I have gone over my INI and HAL file and can not locate an issue.
Picture of the GUI, HAL, and INI file attached.
Picture of the GUI, HAL, and INI file attached.
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Attachment not found
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7 years 11 months ago #120546
by COlger81
Replied by COlger81 on topic NOT SITTING AT ABSOLUTE POSITION AFTER UPGRADE FROM 2.7 to 2.8
I have checked for mechanical issues such as backlash. This is not a mechanical issue as stated, this issue was not there before i upgraded to Master. Seems like something in software has changed.
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7 years 11 months ago #120558
by andypugh
Replied by andypugh on topic NOT SITTING AT ABSOLUTE POSITION AFTER UPGRADE FROM 2.7 to 2.8
Is your GUI set to display commanded or actual position?
(possibly it is now defaulting to actual rather than commanded)
Is this metric or imperial? If metric this might simply be the encoder limit.
(possibly it is now defaulting to actual rather than commanded)
Is this metric or imperial? If metric this might simply be the encoder limit.
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7 years 11 months ago #120560
by COlger81
Replied by COlger81 on topic NOT SITTING AT ABSOLUTE POSITION AFTER UPGRADE FROM 2.7 to 2.8
The GUI is showing actual position. The units are imperial "inch".
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7 years 11 months ago #120563
by andypugh
Replied by andypugh on topic NOT SITTING AT ABSOLUTE POSITION AFTER UPGRADE FROM 2.7 to 2.8
It may have been showing commanded position before the update?
Three tenths isn't terrible for a mill.
Three tenths isn't terrible for a mill.
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7 years 11 months ago #120566
by COlger81
Replied by COlger81 on topic NOT SITTING AT ABSOLUTE POSITION AFTER UPGRADE FROM 2.7 to 2.8
I was using actual position on 2.7 also. It would sometimes dance around .0001". The mill is capable of .0001" but that aside, if that was the case, adjusting backlash should have an effect on the actual position. Adjusting backlash has zero effect on this issue.
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7 years 11 months ago #120568
by COlger81
Replied by COlger81 on topic NOT SITTING AT ABSOLUTE POSITION AFTER UPGRADE FROM 2.7 to 2.8
Here is a picture of the X Pid active. Maybe you can spot something that i haven't.
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7 years 11 months ago #120569
by andypugh
Replied by andypugh on topic NOT SITTING AT ABSOLUTE POSITION AFTER UPGRADE FROM 2.7 to 2.8
I can't remember if anything is different between the PID in 2.8 and 2.7.
Do your PID terms seem familiar?
Did you simply convert the old configs to 2.8, or did you recreate the config?
You could try a bit of I-gain to pull the steady-state error in, but that's not an answer to what might have changed.
Do your PID terms seem familiar?
Did you simply convert the old configs to 2.8, or did you recreate the config?
You could try a bit of I-gain to pull the steady-state error in, but that's not an answer to what might have changed.
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7 years 11 months ago #120570
by COlger81
Replied by COlger81 on topic NOT SITTING AT ABSOLUTE POSITION AFTER UPGRADE FROM 2.7 to 2.8
I converted via the popup auto convert upon first open of Linuxcnc.
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7 years 11 months ago #120571
by COlger81
Replied by COlger81 on topic NOT SITTING AT ABSOLUTE POSITION AFTER UPGRADE FROM 2.7 to 2.8
What is the process for getting my config back to 2.7 compatible?
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