From Makezine.com: http://blog.makezine.com/archive/2010/07/turning-a-hollow-spiral-candlestick.html
A video series on how to use an ornamental mill to create a hollow spiral in a piece of wood. Really ingenious, you'd think it would have been impossible. You basically drill down with a side cutting bit, then move the bit down the piece while rotating it at the same time. Then repeat to cut away the wood on each side of the spiral. Gears keep everything synchronized.
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