I see you have had a few spirited discussions over on the cnczone and maybe some others, I lurk mostly, just trying to soak up some knowledge. Well I have been trying to figure out how to machine with constant rotation on the 4th axis. I have seen others do it with a special PP and a custom configuration in mach. And using vetric software, not f360 or deskproto. I have been chasing this rabbit down the hole for a long time. From what I read you may have some insight into adding a 4th and 5th axis to a cncrouterparts machine. Me not being a programmer, editing a post processor seams daunting. Maybe I should have started a new topic, I doubt I’m the only one trying to expand my 4th axis horizons.