How should a burr be removed from a hole?

Removing a burr from a hole is best accomplished by using an oversized twist drill bit. This method effectively eliminates the raised edge without damaging the integrity of the surrounding material. By carefully reaming the hole with the oversized bit, it allows for precise removal of the burr while ensuring that the hole is maintained at the correct diameter and shape.

This process is preferable as it ensures a clean edge and prevents introducing any additional irregularities that might occur from methods such as chiseling or sanding. Chiseling can be too aggressive and may chip or crack the material, while sanding does not provide the same level of precision and can lead to uneven surfaces. Filing is also a viable method but generally works best for flat surfaces or edges rather than for cleaning up the inside of a hole, which needs the specific action that a drill bit can provide.

Thus, using an oversized twist drill bit is the most effective method for ensuring both the removal of the burr and the maintenance of the structural integrity of the material.