How to cut aluminum hard drive platters?
After determining that a hard drive platter is aluminum (I don't want to try to cut the glass ones), how could I cut it neatly? I'd like to cut out neat rectangles for a small kaleidoscope. I tried a hacksaw, but it was a messy cut, and I expect it bent the optical surface a bit. I tried a rotary tool with cut-off discs, but the aluminum chewed up the discs really fast--I could see the discs shrinking before my eyes into tiny circles.