The first real pcb made with the mill is for a tiny robot. It includes such milling challenges as 0603 smd resistors and SOT-23 transistors, as well as a narrow trace running between two 2.45mm pitch holes with pads.
As intended, this shows the limits of precision with this tool. It is certainly far from perfect, and there are some almost fatal bits of sloppyness, but the board is perfectly functional. All of the scratches and cuts came from trying to cut the board out from a larger piece and from running a small screwdriver along the cuts to clear debris. I quickly tested for continuity between all neighboring parts, but everything is properly isolated.
First, here is the intended pattern which was made in Inkscape after laying things out in Eagle.
And here is the result
Also, I have uploaded the Arduino code here. It is very similar to the code for the plotter, but altered to work with the new z-axis and such.
From here I would like to find a way to improve precision, but I doubt it will get a lot better. That's OK. This is functional and thus much better than nothing. On the other hand, I might do as well by drawing the pattern in ink and then cutting it by hand with a dremel. But where's the fun in that.
Side note: This is a good x,y platform for thin, flat objects that don't impose large side loads. I'm thinking cnc glass engraving, laser etching, ... any other ideas?