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Upgrade the proxxon CNC-mill firmware #1338
However, it needs to be running a later version of Grbl which implement the probing commands.
Current version is 0.8, and the settings are:
New Grbl is V1.1 here https://github.com/gnea/grbl
I've installed GRBLv1.1 and translated the following setting from above into the eeprom.
It seems to work, aeven the G38.2 probing command which I tested by grounding the A5 pin externally while it was in motion. This will need a new wire broken out to some sort of probing switch mounted firmly near the spindle.
Calibration could be don by milling something flat (or in steps) and then probing it.