Well, the nice folks at SoDo MakerSpace got me started on the CNC Mill and Laser Cutter.
I used the smaller mill, a Shapeoko 2, to mill some PCBs. And by "some," I mean "one." Well, the first one broke into a hot mess. So I guess it was "some" after all. Don't get too excited, 'twas but a simple hello world PCB (read: Battery > Resistor > LED).
I used Richard Albritton's PCB-GCode Tutorial. PCB-Gcode is an Eagle add on. Yes. This means you need EagleCAD. The add on outputs to GCode, which the CNC can understand. There's a bunch of settings that Richard has fiddled around and tweaked for optimum optimumcy for the Shapeoko 2.
Top Layer Copper Path Outline
Drilling Through Holes
boop! boop! boop!
Bottom Layer Copper Path Outline
Say what?! Yup! I did a two layer PCB with two tiny vias. I wanted to see if I can do a two sided PCB b/c I'm not patient enough to just route with one side.
... and it works!
ZOMG IT'S A CLOSE UP!
The routes are 16 mils, and it measures pretty accurate. Hooray!
I'm starting to use Eagle for a few things, and I know it's the more "professional" choice, but man do I enjoying using Fritzing!
So next up, using Fritzing to generate millable SVGs. Maybe even see if my bits has enough resolution to mill an Intel Edison breakout. Gasp.
Stay tuned dot dot dot.