moving the router in the Y axis also rotates the 4th axis. This is far, far too clever; it doesn’t require any additional electronics and the only software tweaks are a bit of G-code hacking.

CNC Foam Cutters are capable ... is a HobbyCC FoamPro kit that came with the 4 axis stepper motor control board and 4 NEMA 23 stepper motors. GMFC software is used to both generate the g-code ...

Then the CAM software calculates the tool paths for the actual manufacturing process. CNC routers have a minimum of 3 axes: X, Y and Z, or a 3 dimensional tool travel path. Some have more which means ...