When drilling with a twist drill, you may encounter situations where the hole position is out of tolerance and the hole is skewed. These conditions can be caused by a variety of reasons. The tip of the drill bit may have been blunted, in which case the drill bit can be re-sharpened. In addition, an excessive clearance between the drill bit and the guide sleeve may also lead to out-of-tolerance hole positioning and hole skew. In this case, a guide sleeve with a standard clearance should be used. If the axis of the spindle and the guide sleeve are not axial, or the spindle and the work table are not perpendicular, it will also affect the accuracy of drilling. At this time, the position of the machine tool fixture should be corrected.
If the drilled hole is out of round, it is most likely because the drill bit edge has been severely worn, in which case the drill bit needs to be replaced. In addition, the left and right cutting edges of the drill bit are asymmetrical, the swing difference is large, the chisel edge of the drill bit is too long, the drill bit edge is chipped, there are built-up edges on the drill bit edge, the drill bit is bent, the feed rate is too large, and the drill machine spindle swing difference is large Or looseness may also affect the drilling effect. Corresponding solutions can be adopted to address these problems.
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