Compensation Files

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28 Nov 2023 07:37 #286667 by mighty_mick
Compensation Files was created by mighty_mick
Hello. I've recently struggled with a problem about compensation files, you can see the post that i shared by following this link: forum.linuxcnc.org/38-general-linuxcnc-q...n-files-and-backlash

The thing i wanna know is, does this compensation files work in auto mode? In my setup, i am measuring the effect of compensation files in mdi mode, with executing G-codes. But during machining, the mode becomes auto mode and i don't see the effect in part. In summary, i thought this compensation files does not work in auto mode. I would appreciate it if you share your knowledge about this topic.

Thanks.

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28 Nov 2023 09:19 - 28 Nov 2023 09:19 #286674 by andypugh
Replied by andypugh on topic Compensation Files
It definitely should work in Auto mode.
However, bear in mind that it is at best a partial solution as the system only knows which direction the axis is moving in, not which direction the cutting forces are in.

So, if you are conventional milling it ought to work, but if you are climb milling it might not. be effective.

Are you judging the effect by measuring the part or by comparing the motion.joint position HAL pins?

linuxcnc.org/docs/stable/html/man/man9/m....9.html#JOINT%20PINS

(You can monitor these with Halshow, halmeter or halscope.)
Last edit: 28 Nov 2023 09:19 by andypugh.

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19 Dec 2023 10:54 - 19 Dec 2023 10:56 #288568 by mighty_mick
Replied by mighty_mick on topic Compensation Files
Hello again @andypough. Firstly, thanks for your answer. I have handled it by arranging compensation files. As you said, it works in auto mode but in run time of machine, i didn't hear the extra movements of axises, but it is working well.

I processed pieces with compensation files in linear axises. I actually made some rectangles like stairs, then I've send this pieces to CMM. The results are worse than before(comp file not activated situation). I am wondering why is it happened? It increased the mistake over 2x in horizontal and vertical axises instead of reducing it. The possible reasons might be the home offsets of the machine were wrong, i don't know.

Here is my question,
1. When should i measure home offsets of linear axises? After enabling comp files or before?
2. Why this compensation didn't reduce the mistake in my piece? Why linear axises made higher mistakes in piece? Is there anything that i should do after measuring linear positioning errors and arrangement of compensation files?

Thank you for your answers,
Berkay
Last edit: 19 Dec 2023 10:56 by mighty_mick.

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