Cleaning Debris From Drill Flutes Between Plunges

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A hollow drill (coolant ports), use air. Or an carbide insert drill, less twist in the shank. Air again.
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Two solutions haven't been mentioned yet: you could use a nylon-bristle circular brush, driven at such speed that the drill leading edge won't catch it, at an angle so that it pushes the chips along the flutes. Even an idler brush, with a low-friction bearing, would do (the drill friction will start it up) if you don't mind extra wear. And in addition to an air blast, you could put some mild abrasive into that air stream (like coarse sawdust or soap powder). That adds to the mess, of course, but it WILL scour without hurting the edge.
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