Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

I uploaded a couple of photos of one cutter as well as some cuts made with the cutter. Note that the cuts were made on a Bridgeport milling machine with a spindle speed of 2720 RPM. I think the cutter would work better if I had about 20,000 RPM. The cuts in the copper are not bad considering the rough finish and the slow speed. It appears that I needed to go about 1 mil deeper to get all the copper between traces however.
 
I ground the point on the carbide drill rod using a diamond "sanding drum" in a hand held Dremel tool. I made another one that I filed the point using diamond files (actually knife sharpners) using a coarse one for roughing and a fine one for the final finish. I will try to post some photos of that cutter when I get it finished.
 
Bob

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