How to Sharpen Lawn Mower Blades with an Angle Grinder

How to Sharpen Lawn Mower Blades with an Angle Grinder

Clean mowing is essential for healthy grass since damaged sharp edges are more susceptible to infection and solar injury.

It is critical to sharpening your lawnmower blades on a regular basis, at least once a year. Without honing, the edge will rip the grass rather than cut it.

As a result, homeowners should inspect and sharpen their lawn mower blades on a regular basis. There are several methods for sharpening lawn mower blades, sharpening mower blades with an angle grinder are the quickest and easiest.

Angle grinders are well known for grinding, cutting, cleaning, pounding, and sharpening items.

Also, read our latest guide on: How to sharpen a chisel with an angle grinder.

10 Steps to Sharpen Lawn Mower Blades with an Angle Grinder:

Check the slicing tip to check whether the cutter edge should be sharpened. The lawnmower has a chisel, and the blade is flat and oblique, so only one side needs to be polished.

Step 1: Make Sure to Unplug the Wires

Before operating the lawnmower blade, unplug the power cord.

To prevent gas spillage from the exhaust port, remove the gas tank cap, opening the cover with cling wrap, and replace the gas tank cap.

To get to the rotating blade, the carburetor should be facing upwards. Raise the grass trimmer deck to its highest position before assembling the land mower.

Then, lift the grass trimmer up the slope until it makes contact with the edges. After that, lock the rear wheels and apply the brakes.

Step 2: Slide the Blade Out

Detach the nut from the blade’s center with a socket wrench. If the nut is difficult to move, apply oil to it.

If the blade turns or moves when the nut is removed, use a C-cinch to connect a wooden siding to the lower part of the trimmer to keep the blade from spinning during use.

Slide the blade out of the mower housing after removing the nut.

Step 3: Place the Blades

Place the blade on the table and secure it firmly. Ensure that the blades are securely attached and do not move during the operation.

A land mower has two blades, and the cut faces face each other. This means that you may use each edge of the gadget in turn.

Step 4: Cleaning the Blades

Use a hard metal brush to remove grass, dirt, and debris from the blade.

If the dirt cannot be removed with a wire brush, wipe the blade with coarse sandpaper.

Step 5: Get Ready with Your Angle Grinder

Place the angle grinder to the grindstone circle.

Angle grinders can be furnished with sandpaper, wire brushes, and cleaning machines, yet cleaning a piece of metal requires a pounding stone.

Wear glasses or goggles to shield your eyes from flying sparkles.

Step 6: Run the Angle Grinder on the Edge of the Blade

While keeping the grinding wheel opposite to the slight edge of the blade, roll the point processor from one side to another along the edge of the edge to streamline the serrations regularly brought about by hitting stones when cutting grass.

Instantly remove the metal, continue to move it, and progressively remove it. In the actual event, stop the sander to see your work prior to proceeding to sand the blades.

Step 7: Arranging the Grinder with Blade

As mentioned above, the grinder can quickly remove metal.

Ensure to align it correctly with the blade to remove only a small part of the metal while maintaining extremely high sharpness.

Step 8: Hone the Edges of the Blade

Run the angle grinder from one side to another along the sloped edge of the sharp blade.

Keep the processor’s erratic movement to try not to clean a piece of the sharp edge, however not the rest.

Keep on honing the edge until you see perfect, the exposed metal that reaches out along the length of the rim and the cutting edge is sharp.

Remove the sharp edge from the tight clamp, turn it over, and afterward firmly grasp the other edge of the cutting blade.

See the cut on the edge of the cutting edge and file the sloped edge sharp.

Step 9: Balance the Blade

Balance the blade on the nail by setting the nut opening in the middle of the blade on the nail.

Attempt to adjust the blade on the nail to check whether one end remains down, which demonstrates that it moves more than the opposite end.

In that case, file the heavier end down to diminish weight. Attempt to adjust once more. Proceed with this cycle until the blade is even on the nail.

The balanced blade helps prevent the lopsided cutting and movement of the mower during operation.

Step 10: Re-installation

Apply grease or any oil to the edge of the newly filed blade to keep the uncovered metal from rusting. Splash an entering grease on the fabric and wipe the blade with it.

Insert the blade into the lawnmower and reinstall the nut in the middle.

Use a wrench to fix the nut however much as could be expected to guarantee that the sharp blade is firmly connected to the cutter.

Remove the attached wood and attempt to turn the blade to ensure it is working properly; remove the plastic from the gas tank cap and reconnect the sparkle plug wire.

Check our more guides:

How to Cut Glass Bottles with an Angle Grinder

Angle Grinder Safety Tips to Prevent Accidents

How to Cut Cast Iron Pipe with an Angle Grinder

How to Cut a Bolt with an Angle Grinder

How to Remove an Angle Grinder Disc without a Tool

How to Use an Angle Grinder to Cut Metal

Mower Blades Sharpening Safety Precautions

When sharpening lawn mower blades with an angle grinder, you must wear certain gloves, protective glasses or goggles, protection for the ears, long-sleeved shirts, and long pants.

For your own safety, disconnect the plug cable to prevent the accidental start of the machine.

Sharpen the knife only when you need it, but how do you know if you need to sharpen it? You can find it easily by just looking at the grass.

Also, you can use the best slow speed bench grinder for sharpening blades.

After cutting the grass, just look at the grass. If the cut is uneven, you will know that the blade needs to be sharpened.

The edge of the cutting edge ought to be sharp, yet not extremely sharp. The sharp blades don’t last long, which implies you need to sharpen them again.

In the event that you discover huge scratches or wrinkles on the edge, not resharpening will take care of the issue.

Consider buying a new blade for the lawnmower and sharpen the blade using an angle grinder every two months.


1. What is the best angle to sharpen lawn mower blades?

Hone the edge of the cutting edge with a filer of 10 inches, and hold the filer at a point of around 45 degrees.

Sharp from the highest point of the cutting edge. Slide the filer over the edge one way.

2. What is the best grinding wheel for sharpening lawn mower blades?

Picking the right grinding wheel for sharpening the lawn mower blades relies upon the blade material. It is best to sharpen steel cutting edges on alumina grinding wheels.

For non-ferrous metals, silicon carbide plates are an ideal approach.

3. Do you sharpen both sides of the lawn mower blades?

No, the blades of the lawnmower should be sharpened in a way that one side is sharp and the other side is blunt. If the blades have sharpened both ways, then there are chances that they will get blunt and dull quickly.

4. Can you sharpen a lawnmower blade without taking it off?

When the lawn mower blade is still in the lawn mower, a tool can be attached to the drill bit to sharpen the lawn mower blade.

But this will not give you the best sharp blade, and you must remove the blade from the mower to sharpen it.

4. How much does it cost to sharpen a lawnmower blade?

The expense of sharpening a lawnmower relies upon the size of the blade, regardless of whether you accomplish the work yourself or the professionals.


Sharp lawn mower blades are essential for achieving a completely smooth grass surface.

A lawn mower is not only an investment, so utilize it for maintaining the health of your grass. Keep the trimmer edges on the shredder sharp to keep your yard looking nice, especially if you need help or new components.

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