So, I'm trying to make a PCB with Eagle CAD and pcb-gcode. 10bulls had posted some information earlier on his results with this technique. I have had equally as good results...with large traces.
A project I am working on requires that I use some TQFP packages (0.5mm pitch and 0.28mm spacing). I bought a drill mill from McMaster with a 90 degree angle and I'm having some trouble isolating 10mil traces. Most of them end up being more like 2-3 mil. I really don't like the idea of having to rely on depth of the cutter to dictate my trace width. A mil too much in the -Z direction can almost wipe out your trace. In the meantime I have ordered some 0.005" and 0.006" carbide end mills and I hope those will work a bit more reliably.
Anyway, I wanted to know everyone else's experience with using a milling setup to isolate REALLY small traces. What's the minimum track and isolation you have achieved? What kind of cutter did you use?
Thanks!