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kevin lane wrote:
a regular carbide bit for wood cuts well. the secret is to get the larger diameter bit , otherwise they constantly clog up.
I found that rubbing the tool and work material with a candle really helped with the clogging and produced a smoother cut. I've taken 5lbs of cast aluminum off my PSRU housing, starting on the drill press, then the table saw, then a 'drill saw', and finally a die grinder chucked in a hand drill. I quickly learned to keep a candle very close. In fact, I could tell the table saw blade needed more candle by the way it would squeal loudly when it got dry. After the cut, you could tell see where it got dry, because he aluminum sticks to the dry blade and gets dragged back through the kerf, then jammed back into material, producing a mottled, sickly looking surface. On drill bits, the aluminum sticks to the side of the bit instead of being pulled out of the hole, and eventually bogs the bit down. Sometimes it sticks to the tip, and the bit won't cut at all. A little candle and the shaving flow out of the hole.
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