A 6 mm cross hole through 32 mm round 12L14 walks about 0.3 mm by the time it breaks out. We spot with a 90 degree spot and peck at 2 mm. The drill is a jobber length.
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A spot that is smaller than the drill's chisel, or a spot that is not deep enough to guide the lips, lets a jobber drill skate on the curve. Spot to just over the drill diameter and deep enough that the lips are captured before the peck starts.
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A stub drill or a screw-length drill for the first depth, then the jobber if you truly need the length, stays on line better than one long drill from the start.
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12L14 is friendly, so this is geometry, not the material. Check that the live tool or the spindle is not pushing the bar off a tailstock-less stick-out.
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