As I said, think CNC, as both water and laser jets are CNC these days.
As far as using a milling machine and milling tool, I used a carbide (not as good as others), then boron drill bit to drill the stock discs we did in 1972. It was still a pain, as I started with a 1/4 inch bit, then, went to the 1/2 inch hole, and all done on a milling machine, analog type, with rotary table, all by hand, 72 holes per disc. Took 5 evenings, 4 hours per evening.
Later in 1973, I made a drill jig tool, one that fit the disc into a recessed holder, with the 72 holes in it, with drill guides, so we could do the drilling on a drill press. Someplace he4re, I still ahve that drill jig, hidden from me now. Did another one for the rear disc we used, off a triumph car, 8 inch diameter. The Triumph discs drilled seriously easier, they were cast iron, self lubing, and the hardness orf Silly Putty.
It was way past medium spectacular when we sprung it on the world in the tech line at Daytona, 1973. We held back these discs until the official AMA tests started, and ran undrilled stockers for the first 3 days of open testing. When the discs were first noticed, I was sitting on the one bike in the tech line, with Steve standing next to it, some folks just walked aimlesly away, muttering to themselves. Others just went instantly to 'Japanese think position' (full squat) and out fingers thriugh the holes.One guy from another team saw them laughed loudly, and, then looked at me, then Steve, then the discs, and took off at high speed run to his pals, bringing (dragging) them back to see it all. Nobody else from his team laughed. Worked GREAT. I love stealth!
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