HAL component for tangential knife

We are not out of the woods yet. When I pushed this back to my GitHub, it failed some of the gcode tests. 
github.com/rodw-au/linuxcnc/actions

I kind of know what's going on. I just need time to get to make some changes. Just need to add stuff to reset functions.
 

Finally, I have sent a PR to Linuxcnc on Github for this
github.com/LinuxCNC/linuxcnc/pull/3995

It was a lot harder than I thought. Many thanks to grandixximo for his help ensuring all the runtime tests passed.

great work , i hope it will be included in the comming version

I'm working on it again today to  ensure it works on XZ and YZ planes and also to prevent a helix being treated as a circle. None of this has any impact on your use case.

Over 10 years ago:

forum.linuxcnc.org/show-your-stuff/30648-rugbot-1000

can you please refer to the implementation of it and how to use it and configure the z lift angle and z height , or a demo component of the usage like the Mach3 Implementation