I turned a cane at the makerspace from a piece of aluminium bar. I was going to just polish the aluminium rod instead of machining the entire length but the extruded rod was not exactly circular to start with so I turned it down in a screw thread pattern with a curved cutting tool.

20131007-083358.jpgHere is a close up of the threads.  You can see the curved profile they were cut with.

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