Automaticly return to G90 when probe fails

Hello,
I have a problem here.
I have a tool probe macro, and if I run this macro and stop it for some reason, I will stay in G91 mode because the line where the sub returns to G90 is not executed then. This is a problem, because if someone doesn't remember dramatic things can happen. Is there a way that G90 returns when the routine is stopped from execution or errors ?

Greets Rene

It's possible to catch errors when remapping codes.
Maybe you could remap a code to do probing and if it errors call G90.
Just a thought I have not done this.

Chris M

A thank you to both of you !

Yes you are right with the preamble, but the heavier problems are MDI commands for positioning, doing them with G91 on is dangerous if I forget that, I will try to make an error message that warns me when G91 is activated.

That is a problem.
On my probe routines I try to add some error checking, if the probe fails change to g90 then exit...

www.linuxcnc.org/index.php/english/forum...r-center-of-material

Parameter 5070 is set to 1 if the probe succeeded and 0 if the probe failed.

linuxcnc.org/docs/html/gcode/gcode.html#sec:G38-probe


Rick G

That is a good idea, i did a lot of error cheking to, but when I missed to put the probe in the right place or else, I hit the stop button and this makes the routine stop in the current line, so no additional code will be read.

I will make some dialogs before the probe starts which will ask a few thing and do an M0 so I have to push resume to go on, G91 will be set as late as possible, so I can prevent my machines from the biggest risks.

Isn't that what M73 is for?

Do an M73 at the beginning of each subroutine to save the modal settings.

Then when the subroutine exits -- by a return, or by falling through the bottom -- the modal settings will be restored.

Ken

Not sure that M73 will work if you abort a running program. Docs say

Aborting a running program in a subroutine which has an M73 operation will not restore state .

But until I read this thread I wasn't even aware of M70-M73 so I haven't tried it myself

You are correct. The state will not be restored on an abort. But having a subroutine explicitly saving and restoring the state won't work either. On an abort, the stack is just thrown away and the restore code won't run.

Ken