Originally Posted by dpot
devcadcam it will give you G codes for most cnc machines
Yep. I also use this, and it works great. It is a cost, where the Sketchup/SketchUcam is free.
On my machine at least I need to be careful where the Z axis 0 is. With DevCAD/CAM it is at the bottom of the piece, and with SKetchUCAM it is at the top. I make sure I comment the Gcode file so I know where to zero when I go to re-cut a piece later.