How to Sharpen A Lawnmower Blade


If you’re like me, you have a lawnmower and it’s probably old. It’s also likely that your mower has been sitting in the garage for the past several months because it’s too cold to cut grass. Well, good news! This is also the perfect time to sharpen your blade so that when spring comes around again, you’ll have a freshly sharpened blade ready to cut through those thick blades of grass. The process is simple and can help make sure that your lawn looks its best come summertime.

Collect your tools.

Before you can sharpen a lawnmower blade, you’ll need to gather the necessary tools. Here are the things you’ll need for this job:

  • Safety glasses and gloves (to protect yourself from flying debris)
  • A lawn mower blade sharpening tool (following the instructions for your specific model)
  • A stone or grinder with an abrasive grit of about #300 or greater
  • A cloth rag to wipe away excess oil after using it on your blades; this will help prevent rusting

Startup you mower.

  • Startup you mower.
  • Check the oil and fuel levels. Make sure your air filter is clean.
  • Check that the spark plug is clean, not cracked or burned out, and properly gapped to the correct size for your lawnmower’s engine.
  • Make sure that all blade mounting hardware is tight and secure (bolts, nuts, etc.).

Ensure that the blade is balanced.

First, check the blade for damage. If a blade is bent or cracked, it will not cut well and may even cause the mower to throw off your balance. To test whether or not a blade is damaged, run your finger along its edge in both directions. If you feel any roughness or uneven spots on either side of the blade, then it has been damaged and should be replaced.

Next, check the balance of your blades by running them through grass with one hand while holding onto the handlebar with your other hand to keep control over how much resistance there is between them as they pass through tall grasses like stalks of wheat or weeds growing underneath them (which can get caught up in between two mowing passes). This way you can determine whether or not there are any discrepancies between one side versus another when both are moving at roughly equal speeds through thick clumps of roughage – any difference indicates that one side needs tightening up so as not make contact with each other too hard when cutting grasses altogether; otherwise all friction caused by resistance might result in overheated bearings which could cause further problems down road if left unchecked!

Properly secure the blade.

  • Use a vice. This is the most common method of securing the blade, as it’s easy to get your hands on and works well with all shapes and sizes of blades. You can find vises at any hardware store, or if you’re feeling crafty, you can use objects around your home like a clamp or screwdriver to secure the blade instead.
  • Use a clamp. There are several types of clamps that work well for sharpening lawnmower blades: C-clamps, pipe clamps (which attach via round metal rods), bar clamps (which are essentially giant clothespins), and more! The type of clamp you use depends on whether or not it will fit onto your particular lawnmower blade; make sure that whatever implement you use can comfortably hold both sides together rather than just one side alone! Some people even prefer using two separate clamps for each half so there’s no risk of slipping while working on their project in case one part starts moving unexpectedly during sharpening.”

Sharpen your lawnmower blade.

Lawnmower blade sharpening is a multi-step process. First, you’ll need to find the right file.

  • File Size: The first step in sharpening your lawnmower blade is to find a file that’s the same size as your blade. If you’re unsure about which size of file to get, consult your local hardware store or an online guide for help choosing one.
  • File Shape: After choosing a suitable file, it’s important to make sure that it has the same shape as your lawnmower blade (or at least close). Most blades have long edges on either side of their central hole; these should be matched up with each other by using a chisel-like tool called a “file card.” This simple method ensures that both sides will be ground evenly and won’t chip off unevenly during use over time due to internal stresses caused by improper grinding techniques (which could lead them into bending more easily under pressure).

Check for a rounded tip.

The first thing you need to do is check the blade for a rounded tip. To do this, grab a file and run it across the cutting edge of your lawnmower’s blade. If there are no sharpened areas, and if it feels rough (like sandpaper), then your blade is likely ok! But if you find that there are very small and evenly spaced sharpened areas along the cutting edge of your lawnmower’s blade, then it’s time to sharpen it.

If your mower’s blades are not round, they need to be replaced before they can be sharpened.

A sharpened lawnmower blade will make for a nicer looking lawn.

A sharpened lawnmower blade will make for a nicer looking lawn. A sharpened lawnmower blade will make for a healthier lawn. And a sharpened lawnmower blade will make for a safer, more efficient, and longer-lasting lawn.


Sharpen your lawnmower blade! We hope this guide has helped you understand how to sharpen a lawnmower blade.

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