CNC screenshots tutorial with step by step as milling PCB generated in Fritzing (v. 0.9.3b), with Gerber files converted into G-Code with CopperCAM and finally milled with bCNC ( GRBL / Arduino ) command sender, autoleveler and g-code editor.
Youtube: CNC PCB from CAD to CAM with Fritzing CopperCAM and bCNC
If you prefer, the tutorial can be downloaded in .pdf here:
https://drive.google.com/file/d/0B37...1ZNDZFTEE/view
Fritzing: Fritzing 0.9.3b
CopperCAM: https://www.galaad.net/coppercam-eng.html
bCNC: https://github.com/vlachoudis/bCNC