Published Oct. 8, 2017, 3:11 p.m.
I'm using a self-centering three-jaw chuck to hold the hammered ring in place. I start with cutting the inside of the ring so the chuck clamps are on the outside of the chuck.
Once the inside is cut, so that all the metal has touched the cutting tool, then the piece can be re-chucked with the inside clamped. Since the inside is now perfectly round, cutting the outside will match the inside circularity.
The faces of the ring can be done as well, one for each of the clamping positions.
Note to myself: It would be useful to have two chucks, one set for holding the outside of the piece, and one set for holding the inside of the piece, as changing the clamps takes a bit too long.
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