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So, the foot is spring loaded towards the board and the router to foot dis tance is controlled by a solenoid? That seems pretty easy to rig up. I'm no t sure why you'd (at least I'd) need to vary the Z axis at all. The range o f widths in their bits seems to be only a couple of mils. Seems like if you 're (I'm) drawing outlines of copper, a cut's a cut. If I need a wider cut, why not just take two or more passes? The software for that would be prett y simple once the rest was done.
I doubt I'd be able to find it in my archives, and if I coupld, it may very well be on an 8" floppy, but actually, years ago when I used a layout serv ice in Canada to design boards, and all I had was a single-pen plotter, I w rote software to read Gerbers and draw the outlines of actual-width traces. Of course, I was younger and smarter then ;) Seriously, though, once you h ave the picture in your head, it's just a matter of drawing rectangles with rounded ends. Not a very big deal at all.
Now, I'm in danger of actually doing this. I have a couple of X-Y mechanism s kicking around and a 45Krpm handpiece...
Dammitall, I still have actual work to be doing!