I have done a little machining on Niobium which is I believe also called Columbium. It was easiest cut under a good flow of trichloralethalene (not in my spell checker). Trichloral is a carcinogen so I tried to be else where when it was cut, but occaisionally I had to do it. We liked taking it back to the welding shop, it really heats up funny. If I remember correctly they now cut the Niobium with CNC EDM, I might be wrong about that.
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