On a 4-axis hot-wire cutter the wire stretches between two towers. X and Y drive one tower end (depth and height), and U and V drive the other end independently. When X/Y and U/V move differently, the straight wire tilts and sweeps a tapered or twisted surface — that is how you cut a wing that changes shape from root to tip.
On a 2-axis machine the wire stays perpendicular, so U/V simply mirror X/Y. https://cncfoam.com stores motion in this canonical X Y U V form and, at download, can remap the letters to whatever your controller expects (for example U→Z, V→A) via its G-code profile settings, so the file matches your firmware without changing the motion.
On a 2-axis machine the wire stays perpendicular, so U/V simply mirror X/Y. https://cncfoam.com stores motion in this canonical X Y U V form and, at download, can remap the letters to whatever your controller expects (for example U→Z, V→A) via its G-code profile settings, so the file matches your firmware without changing the motion.