Thanks for all of your help I have it working now. Now to see how it works in my CNC mill.

Thanks for the reply I will have another go in the morning using your insights. I have tried to add the SVP file to this message but Iam not sure if it will work as I have onlyjust joined.

I am trying to follow these instructions http://scuola.arduino.cc/en/content/prepare-file-milling Inkscape stuff is about halfway down. Unfortunatly I cannot get it to work I think because it was originaly written in Italian. Could someone offer any clues to make it more understandable. Thanks