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Drill angle
In metalworking the harder the material the flatter the angle. Although each material warrants slightly different sharpening methods. Wood tends to have a more pointed tip. You can sharpen brad point drills with a small file or stone following the contour of the cutting edge. Usually in wood the drill just needs a touch up on the cutting edge unlike metal where the drill edge usually melts or breaks and needs more extensive sharpening. Sharpening by hand is not that difficult you just need to practice and make sure both flutes of the drill are the same length, you can measure them or use your eye. Paul
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