NOT SITTING AT ABSOLUTE POSITION AFTER UPGRADE FROM 2.7 to 2.8

COlger81
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13 Nov 2018 13:17 #120534 by COlger81

NOT SITTING AT ABSOLUTE POSITION AFTER UPGRADE FROM 2.7 to 2.8 was created 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.

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File Name: my_LinuxCN...hine.ini
File Size:4 KB

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File Name: my_LinuxCN...hine.hal
File Size:25 KB

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COlger81
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13 Nov 2018 14:36 #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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andypugh
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13 Nov 2018 15:36 #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.

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COlger81
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13 Nov 2018 15:43 #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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andypugh
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13 Nov 2018 15:49 #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.

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COlger81
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13 Nov 2018 15:55 #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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COlger81
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13 Nov 2018 16:04 #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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andypugh
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13 Nov 2018 16:17 #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.

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COlger81
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13 Nov 2018 16:22 #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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COlger81
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13 Nov 2018 16:37 #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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NOT SITTING AT ABSOLUTE POSITION AFTER UPGRADE FROM 2.7 to 2.8

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