Which of the following is NOT a reason to replace a drill bit?

Replacing a drill bit is essential to maintain the quality and efficiency of drilling operations. A drill bit that is dull, damaged, or bent directly affects its performance and the quality of the workpiece.

When a drill bit is dull, it requires more force to cut, resulting in overheating and potentially damaging the material being worked on. A damaged drill bit can lead to poor precision, and unsafe operating conditions, and may even break during use. A bent drill bit can also cause inaccuracies in drilling, leading to undesirable results in the assembly process.

In contrast, a shiny drill bit does not present a performance issue and can indicate that the bit has been recently sharpened or used properly. Therefore, it is not a reason for replacement. Recognizing that characteristics such as dullness, damage, or bending directly impact the efficiency and safety during drilling helps clarify why it is essential to identify those specific conditions for replacement, rather than simply relying on the visual appearance of the bit.