Anyone used drag knife support in grblHAL?

[phil-barrett]

I see there is support for a passive drag knife. Anyone have tips or suggestions about using it?

Also, I don't think a tangential drag knife is supported. (dragknife turned by a stepper/servo motor) Is that true? I think Mach, UCCNC and LinuxCNC support tangential. It would need to determine the direction of the cut from the X, Y direction and turn the tangential cutter in that direction. I think that also means the cutter needs a homing sensor and a way to tell grblHAL the orientation of it.