circle radii are read from a file using python M1xxx code. SETS is used to assign that value to motion.analog-in-00. M66E0L0 is used to read that into #5399. Gcode uses #5399 to cut increasingly larger cones, refining a form like in EDM. The smallest cone is cut with large power, leaving rough surface. Subsequent motion uses less and less power leaving smoother and smoother surfaces as the print dimension is approached.