If your drill bit takes longer than usual to penetrate the material, it’s likely dull and needs re-sharpening. A sharp bit should cut through efficiently without extra effort.
When drilling, a sharp bit cuts smoothly and quietly. If you hear squeaking, grinding, or unusual noises, it’s a clear sign that the bit has lost its sharp edge.
A dull bit generates more friction, which causes heat. If you see burn marks on the material or the drill bit itself, it's a sure sign it needs sharpening to prevent further damage.
A sharp drill bit creates clean, precise holes. If your holes are jagged, uneven, or have rough edges, the bit’s cutting ability has diminished, signaling the need for re-sharpening.
If you find yourself applying more pressure to make the drill bit cut, it’s a sign of dullness. A sharp drill bit should require minimal force to drill into the material.
A change in the color of the drill bit tip, usually turning blue or dark, indicates it’s been overheated due to dullness. This is a warning that re-sharpening is needed before further use.
Visibly inspect the bit. Any nicks, chips, or dents on the cutting edge mean it’s no longer effective for smooth drilling and needs re-sharpening to regain its sharpness.
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