Yes it has to be flipped. Usually you can check the flipped option in your CAD software. I didn't try with eagle but it generate one gcode file for the PCB seen from the top and from the bottom. I don't knwo if they are flipped by default. But this problem exist even with DIY chemical etching.levlandau2 wrote: So when the PCB is flipped, the corresponding CAD have to be flipped as well right?
This depends on the CAD Software and how you generate the GCode from your PCB file. I actually never tried to mill double faced PCB, so I can't really help you on that.levlandau2 wrote: Also what happens to the 0,0 alignment at this point, assuming one did not start at the extreme edge of the PCB??
The best thing to do is to try on a piece of paper with a pen instead of your regular spindle. Depending on the result, you will be able to fine tune your settings.