Just started working with my first piece of cnc kit, a german BZT pf750 router table. I have the dos based PCNC software with it and ive run a bit of Gcode no trouble but I want to run hpgl gode which the software can do. As the machine has a 110mm travel on the z axis im having to set the plunge of the bits at around 80mm to hit the workpiece when working with HPGL but its tediously slow running programmes where the bit has to raise and plunge. Is it possible to set the zero point on the z axis at say 70mm within the software as I cant work out a way of doing it?