[QtDragon] Auto Tool Measurement approach and UI wishes/issues

My machine spindle has an ER11 collet, so manually changing tools will not ensure a consistent height. Therefore I wanted to have a mechanism to automatically measure the new tool length after each manual M6 tool change.

The attached remap code basically this

• spindle moves to change position
• operator manually changes tool and confirms in UI
• spindle moves to toolsetter position
• absolute position is probed and a reference position is subtracted
• resulting tool length is set into tool table
• tool length compensation is activated (G43)

My workflow should now look like this

• preparation phase
  • load a tool with remapped M6 to get a proper tool length measurement
  • use tool to touch off workpiece and establish the correct Z height
• running NC file
  • any M6 tool change will ask the operator to change the tool manually in the change position and after a tool length measurement the new tool length will be applied in the compensation

Wish: This seems to work so far when I manually enter the M6 T<tool> as MDI command. It would be more convenient to have an "M6 Tn" button additionally to the "M61 Qn" button.

Issue: In order to touch off Z0 on top of my work piece, I use a touch plate. Currently the only way to correctly do this is using PROBE (VersaProbe). Setting ADJ OFFSET -> SET Z to my touch plate height, enabling AUTO ZERO and using the probe down button.
However, when I use TOOL -> TOUCH PLATE the current tool length gets subtracted. Maybe it was not meant to be used that way.

Another wish: OFFSETS and PROBE both define workpiece heights and tool sensor heights. Both not needed with this approach. So, it would be nice if this would be configurable, maybe a separate tab for the different types of auto tool measurements.

For who made it so far, here the required settings in the INI to make the qt_simple_probe.ngc remap work.

Happy Probing
Guido
 

Well that's some good work.
If there are others that wish this option, I could add it to the master repository.

Qtdragon is made to be customized.
adding a button should be easy.

Well, I just used qt_auto_probe_tool.ngc as a starting point for the remap. The rest was trial and error and a combination of various auto tool measurement approaches found in this forum. It still has a lot of debug outputs, because I wanted to see the results of the calculations.
First, I wanted to use the example from G38 , but it misses the actual result in #5063. Can somebody confirm that the example is incomplete?

For my TOOL -> TOUCHPLATE issue, I see that this is a functionality from inside QtVcp, and not QtDragon specific. It cancels tool-length compensation when using the touchplate. I would have wished that the actual implementation of TOOL -> TOUCHPLATE would have been more "accessible". I had to dig through multiple layers until I found it. I had hoped for just an NGC file like the ones used for remap or macros. But I guess the checking and error handling prevents it from being implemented as an NGC script.
 

Try this to add a tool change button:

add this file (rename it qtdragon_handler.py) in your config file, in the folder qtvcp/screens/qtdragon
If anything goes wrong just remove that file and the original will be used again.

Yes! Thanks! That works pretty sweet!

I had seen that there are multiple ways to extend and modify screens like qtdragon, but I wasn't aware that you can add a button without editing the .ui file in QtDesigner.

I commented out the 'isManSensitive' as the other buttons are also not. However, after TOOL CHANGE the machine is in MDI mode. I haven't paid much attention to the modes. E.g. after a jog it's anyway back to Manual mode.

Is it possible to override /usr/lib/python3/dist-packages/qtvcp/lib/touchoff_subprogram.py in a similar way? I tried copying to <my_config_dir>/qtvcp/lib and editing it, but it did not work.

For my purpose I need to remove the G49. Then I can use the TOOL -> TOUCH PLATE to touchoff my workpiece. Otherwise the tool length got subtracted from the final result.
This is probably not an issue with the probe height + workpiece height approach for automated tool length measurement, as the tool lengths in the tool table stay zero there, as far as I understand.
But for anybody using a tool length from the tool table the TOOL -> TOUCH PLATE should not work as expected. Or I do not understand its purpose. Please explain, if I use it wrongly.

Ok I used dome black magic voodoo to patch an alternative touchoff_subroutine.py location.

same as before:
add (I guess overwrite the last one) this file (rename it qtdragon_handler.py) in your config file, in the folder qtvcp/screens/qtdragon
If anything goes wrong just remove that file and the original will be used again.

but now also copy  /usr/lib/python3/dist-packages/qtvcp/lib/touchoff_subprogram.py
into your config file, in the folder qtvcp/lib/
then modify that program as you see fit - remove the G49

Please test carefully.

Chris