DIY Network

How To Sharpen a Lawnmower Blade

If a lawnmower blade isn't sharp enough, the grass will end up with a jagged cut that opens it up to disease. Below are steps to sharpen the blade.

More in Outdoors

put dull blade in vise and sharpen with file
  • Time

    1 hour

  • Price Range

    $1 - $50

  • Difficulty



Step 1: Remove the Blade

Disconnect the spark plug. Using a wrench, remove the blade from the mower. If it’s too tight, spray some lubricant on it.

remove blade from mower

Step 2: Use a File

Put dull blade in a vise and sharpen it using a file. You could try to do this by hand, but putting it in a vise is less awkward and will get the job done more quickly and accurately.

Step 3: Use a Drill and Stone

Another way to sharpen a mower blade is by using a drill and a special sharpening stone. Power it up and run it along the dull mower blade. Experts disagree on how often you should sharpen your blade. The range runs from every 2 weeks to every 6 months. To lessen the chances of a super dull blade, pick up twigs, rocks and other debris in your yard before you mow.

use drill and sharpening stone on mower blade