I know there is software for routing PCBs as I had done some research on it awhile back. All of my links on this subject were on a old computer which had died... If you do a goo search and checkout some youtube it may lead you in the right direction. I did a quick search... here are a couple of links...
http://www.instructables.com/id/How-to-Convert-and-Mill-your-PCB-Layouts-on-your-C/
http://michaelhleonard.com/cnc-milled-pcbs/
http://www.open-electronics.org/3drag-as-a-cnc-milling-machine-creating-g-code-from-gerber-files/
http://www.kellyware.com/kcam/
http://flatcam.org/
http://reprap.org/wiki/PCB_Milling
http://www.pcbgcode.com/
http://www.circuitcam.com/