How to Sharpen a Drill Bit
Restore dull bits to cutting condition
Mike Rodriguez Updated 2025-07-20 10 min 5 stepsSave money by sharpening dull drill bits instead of replacing them. This guide covers bench grinder and hand-file techniques.
10 min
Time Required
Free
Estimated Cost
5
Steps
medium
Safety
What You'll Need
Tools
Step 1 of 5
Inspect the Bit
Look at the cutting edges. A sharp bit has crisp, defined edges. A dull bit has rounded edges and a shiny, worn appearance. Compare to a new bit if available.
Tip
A dull bit requires more pressure and creates heat — both signs it needs sharpening.
Step 2 of 5
Set Up the Grinder
Use a fine-grit wheel on a bench grinder. Adjust the tool rest to approximately 59 degrees (the standard drill bit point angle). Ensure the wheel is dressed and true.
Warning
Always wear safety glasses when using a bench grinder. Sparks will fly.
Step 3 of 5
Grind the First Face
Hold the bit at the correct angle with the cutting edge parallel to the wheel. Touch it lightly to the wheel and sweep across. Check frequently — remove as little material as possible.
Step 4 of 5
Grind the Second Face
Rotate 180° and grind the other cutting face to match. Both edges should be the same length and at the same angle. This creates a centered point.
Step 5 of 5
Test and Adjust
Try drilling into scrap wood. A sharp bit produces clean chips and cuts with minimal pressure. If it walks to one side, the edges aren't equal — grind the longer side to match.
Common Mistake
Removing too much material or overheating the bit. Use light pressure and dip in water to cool.