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Drill Doctor

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PekkaNF:
Thanks Ian

I tested today three drills, all same diameter one with slower helix and two with faster helix. Experiment conforms that helix angle has an effect on initial setup and shows dramatically on splitting the point.

I'm fighting the flu big time, I did not check yet what diameter they drill. I think that sharpening has failed if diameter is 0,1 mm larger than the drill at lips.

Pekka

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