How to Sharpen a Miter Saw Blade


Miter-saw blades can be expensive, and once they start getting dull they become hard to use. When a circular blade dulls, it just means the straight, flat edges along the thickness of the metal have started to become slightly rounded. You can flatten those edges back out, sharpening the blade yourself in about 15 minutes with a good hard file and a little patience.

Things You'll Need

  • Workbench with mounted clamps
  • One crayon
  • Small diamond file
  • Remove the blade from the miter box and set it in the clamps on your workbench.

  • Use the crayon to make a mark on any one of the blade's teeth.

  • Set the tip of the diamond file at the bottom front edge of the first tooth. Slide the file forward and upward along the edge in one smooth motion, keeping the face of the file on the flat part of the thickness of the metal.

  • Run the file over the flat part of the top of the tooth, without touching the point.

  • Continue to the other teeth, running the file in smooth, consistent motions along all the flat portions of the teeth, without touching the corners or points. Reposition the blade in the clamps to get to the other half when necessary. Stop when you get to the crayon mark that indicates you've gone all the way around the blade.

Tips & Warnings

  • Make sure the miter saw is unplugged before you remove the blade.

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