Thanks Paul! The carbide insert end mill is one I found in my buddy's stash of stuff when he was selling off his metalworking tools. It was still unused, in the tube. I didn't realize you could even get them that small. I don't like insert tooling enough to pay new prices for tool holders, in this case I got the thing so cheap that I couldn't pass it up. I really like it for mild steel. The inserts aren't the best for aluminum, like in this project, but it was more convenient than using a fly cutter.
Mine is an "Anser Dex", by the Harbor Tool Company. Model HS-050 end mill. They apparently went out of business well over a decade ago. But Cutting Tool Technologies makes an identical model, and suspiciously the model number is even the same - HS-050. You can buy them new, here, for $180: Cutting Tool Technologies: HS-050 End Mill That seems very reasonably priced based on what I've seen, so if you're inclined to buy new insert tooling then it's probably worth a look. The inserts are SPEH-2.522, and reputable ones seem to cost about $20 each. You can find the less-than-reputable ones for just a few bucks each.
Nice! I nearly did the same, but had to follow through with this idea once it popped into my head.
Haha thanks! If these had been larger collets I would have made the rack from several pieces. The nice thing about this design is if the slots aren't a snug enough fit to keep the collets from going anywhere, it's just as easily mounted on its back so they really won't go anywhere.

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