I just ordered an 8" x 1/2" slug of forged 101 copper. I want to turn it down to a 7.875" x 0.480" cylinder. I've heard horror stories about how hard (soft) copper is to machine. This is largely a decorative piece, so dimensions aren't critical, but I'd like a decent finish on it. First question--how do I chuck it? I've got a Logan 816 (10" swing) with 3-jaw and 4-jaw chucks, but I'm thinking taping it or screwing it to a faceplate would be my best bet? I do have forming taps so can screw into the copper from the back. Next question--what tool should I use to face it and turn down the diameter? Last question (for now)--what speed and feed?