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The error log has identified an issue (noted above), you will need to address this.

Hello, I am running the master branch of LinuxCNC with QTLathe GUI. I have a Python component that reads the feed rate from linuxcnc.stat and further use that value in my C component. The machine seems to randomly hard crash and exit LinuxCNC fully. What could be the problem ar what could I change to solve this? Thank you in advance! I am attaching the Python and C components, .ini and .hal files and the error log.

Try the link in this earlier post:
forum.linuxcnc.org/16-stepconf-wizard/26...ulator?start=0#34752

Thanks!

do you also have an idea for my second issue?

Lichuan strange company i buy at aliexpress & receive a water damaged garbage and no one wants to be responsible for it. 

Ok that makes sense basically, I only really need it to use like a limit switch, so I only need the index signal to home it. Thanks

Did you follow the surface map read me instructions and copy over the subroutines? Those are what set the var file parameters for surface map page

I'm not super familiar with surface map, but I would guess it's because the bar doesn't have those parameters or the subroutines that updates the bar have those and needs to be updated.

I've got nothing, I've not seen that write and cannot produce it here to troubleshoot. I would update to the develop branch and update your config files. Start there so at least we know you're on a known working version.

You need to set the parameters in the UI only

The rack is is calculated automatically based on your pocket location settings in the ui