By the way there is a way to reduce machining time of complex 3D surface even though you use "dumb" CAM software and/or old CNC controller. You can simplify a true G-code using MetaCut Finish (http://www.nwdesigns.com/Products/MCFinishNutshell.htm) by fitting arcs, lines or curves (nurbs) to the point-to-point toolpath. -Petr