I’ve been able to mill a couple of the Eagle example PCBs. Here are some pictures. The first is the tutorial3 board. I’ve only milling the top side etch and the drill holes.
The second is the ATMEGA example. This picture also shows a ruler for size.
The last picture has the holes drilled and I sanded the board to remove the small copper burrs from the milling.
The Eagle ATMEGA shows the narrowest trace width as .008". I’m a newbie to Eagle, so I may have that wrong. I will post the settings I used.
Dave