http://www.engadget.com/2006/06/29/how-to-build-your-own-cnc-machine-part-1/
http://www.engadget.com/2006/07/04/how-to-build-your-own-cnc-machine-part-2/
http://www.engadget.com/2006/07/11/how-to-build-your-own-cnc-machine-part-3/