https://resources.imaginit.com/manufacturing-solutions-blog/modify-fusion-360-and-inventor-cam-post-processors-to-setup-a-4th-axis
Modify Fusion 360 and Inventor CAM Post Processors to setup a 4th Axis
How to customize your CAM post processor to include a 4th Axis with Fusion 360.
cam post processorsmodifyfusioninventorsetup