I have 14 slots (elongated holes) to make in a 3/16" thick aluminum angle. I've already tried local machine shops. They don't want the job. Anyhow, I also won't do it with a router. The chance of a catch that I can't control is too high in my opinion. The hole needs to fit an 8mm bolt....so lets say about 9mm or 10mm, and the slot is about a 1/2" long.
Short of drilling 10mm holes and then brute forcing the rest with a die grinder, does anyone have a good technique for making these slots?