Quick Check list 7 Mar 2019: Rapid Z Gaps and Home Z are set above the top of your material in CAD/CAM software. Mach2/3 Arcs (inch) (*.txt) is the postprocessor used. Mark the X,Y Datum corner (lower left corner) Z Zero (normally the machine bed (spoil board)). Mark safe holddown (nail/screw/clamp) locations. Use your eye and ear protection! Set Up the CNC Router