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Hi JR! I use designSpark, and when I do the PCB layout, I just pick an origin, and then find the location of all the holes, and then write them down and convert it to gcode. The main problem is that I use the free version of Mach 3, which only allows 500 lines or something like that, so I break up the programs into small pieces. The program I made to etch the power board is 5 separate files of 200 or 300 lines each.
My CNC machine is just a home made conversion. Two direct drive 1200ounch*inch stepper motors for x and y, and a 600ounch*inch stepper motor for Z. The machine is a Harbor Freight geared head mill that has an x travel of around 12 inches or something, and a y travel of around 6.5", and z travel of maybe 6 inches. The x and y travel used to be a little larger, but my homemade adapter plates got in the way a little bit. I use the Gecko 300b or 600b or something like that for the driver. It's a single box that has 4 axes of control possible.
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