Probing Script Breaks when updating to LinuxCNC v2.8.2

  • MartyJ
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26 Sep 2021 00:08 - 26 Sep 2021 00:09 #221590 by MartyJ
Hello all, I upgraded to v2.8.2 and my probe routine fails after update. Machine is a XYYZ gantry running off of Buster + 5i25/7i76.

The error indicates that "probe contact during axis move". This occurs during the G00 retract move in my probe script after high-speed probe initial contact.

G38.2 Z-6.5 F50
G0 Z0.04 << error occurs
G38.2 Z-0.045 F1

Any ideas? I saw there were updates to hostmot2, is there an error in my setup or a workaround known?

Thanks! (hal and ini attached)
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Last edit: 26 Sep 2021 00:09 by MartyJ.

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01 Oct 2021 13:55 #221956 by andypugh
This might be related to github.com/LinuxCNC/linuxcnc/commit/4ceb...580465853dece92f3be9

ie, there was a bug previously such that probe contact could sometimes fail to trigger the error that it should.

It seems likely that your probe is bouncing on retract (A G0 from contact to no-contact shouldn't cause a fault bit might if the probe has contact-bounce)
Adding a fast G38.1 move to take the probe out of contact might help, before the G0.

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  • MartyJ
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01 Oct 2021 15:43 - 01 Oct 2021 15:45 #221969 by MartyJ
Very interesting. I think you're exactly right. If that's true, the reason my probe script worked at all (and a lot of others - this is based on many other similar examples I found out there) was because of the bug that ignored probe trip during named o-word functions. Yikes, kinda. I'll play with it and update with what I find out. I'll start by tweaking my debounce settings.
Last edit: 01 Oct 2021 15:45 by MartyJ.

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