How To Sharpen Your Lawnmower Blade?

Do you know how to sharpen your lawnmower blade?. Have you been cutting grass with your lawnmower and feel like it is longer than it should? Do you see raggedly cut grass? Well, you might need to check your lawnmower blades for their sharpness.

Ask any homeowner what the one most important tool that helps them in keeping their lawns well maintained is? He or She would say it is their lawnmowers. Yet, frequently, it is these machines that are neglected when it comes to their maintenance.

The blade is an essential part of the mower.  If it is in bad condition, it will affect your grass cutting session. And the adverse effects are not just related to the look of your garden. A ragged top cut on a leaf of grass opens up the grass plant and creates a perfect situation for grass diseases.

Lawnmower blades often need sharpening. It is recommended to sharpen these blades at least two times every season. This maintenance action would make it easy for you to maintain a green and healthy lawn. Keeping your lawn mower blade sharp is your first line of defense against lawn diseases.

In this article, we show you the techniques of sharpening your lawnmower blade.

Learn How to Sharpen Your Lawnmower Blade

From Dull Blade to Sharpened Blade

Sharpening the lawnmower blade is one of the best ways to ensure that your lawn mowing session is efficient both in time spent as well as proper grass cutting. So, consider sharpening the blades every year before the mowing season starts.

If you regularly hit the rocks or work with ground, it is better to sharpen it again in the middle of the season. There are various methods used to sharpen a lawnmower, including the use of hand file, bench grinder, angle grinder, or rotary tool. A lawnmower blade sharpener helps you make your lawn-cutting job faster and less stressful. Here, we provide a detailed guide for a lawnmower blade sharpener that works for almost all lawnmowers.

Tools for Sharpening Lawnmower Blades

Tools & Materials

    • Closed-end wrench
    • Mower blade
    • Torque wrench
    • 10” file
    • Vise
    • Hammer
    • Nail
    • Gloves

There are many sharpening tools to choose from when it comes to sharpening your mower blade. These include manual as well as power tools. Finding the right tool for your job depends on your budget and how much you mow. Those who cut grass like a professional service provider should invest in one of the high-end power tools designed and manufactured specifically to serve that purpose. These are called grinders and usually the best choice for blade sharpener tools.

Homeowners generally do less mowing compared to professionals and can select from various options available for lower-end power and manual tools. If you intend to save money, you can rely on the manual, traditional file. Most homeowners would find power drills with attachments that work as a mower blade sharpener a great choice.

What You Should Know Before Sharpening the Blade

Regardless of which tool you use, before you start, you should know some essential things such as:

  • How sharp the blade should be
  • How frequently you should sharpen
  • When sharpening does not work

As you feel eager to fix your lawnmower by sharpening the blades to get better grass cutting, you might think that you should aim for the sharpest possible result. However, that is not the case. You should try to achieve a delicate balance. The cutting edge of the mower blade has to be sharp but not razor-sharp. If you sharp it too much, the edge will not hold up for longer, and you will have to sharpen it again soon.

You should sharpen the blade at least twice a year. If you find large bends or nicks in your blade, the sharpening is not going to correct the issue. You should consider replacing your lawnmower blade instead.

Removing the Blade

Before you start anything, take note of the precautions you need to take. Remember, safety comes first. Ensure your work area is free of any clutter, and you keep children far.

Follow the following tips:

  1. Read your lawn mower’s instruction manual
  2. Wear protective goggles, hearing protection. Gloves and long pants are also a must. Another safety recommendation is to wear sturdy close-toed shoes
  3. Ensure that you disconnect the machine from its power source. If it is cordless mower, remove the battery pack. This precaution will ensure that the engine won’t start unexpectedly.
  4. Remove the spark plug especially if you sharpen the blade without detaching it from the mower

We recommend removing the blade before sharpening. However, it depends on the design of your mowing equipment, whether you can sharpen the blades without removing them. Removing blades can save you a lot of time. But removal provides better access to the blade’s edges. It also facilitates better visual inspection of any existing damage that occurred on the blade, such as excessive wear or stress fractures. Moreover, consider emptying the gas tank so that no fuel spills when you remove the blade.

Blade Removal Process

Next, turn the mower on the side that exposes the bolt or nut securing the blade to the mower. Use a short wooden block between the inside surface and the end of the mower blade to keep the blade from turning. Now, with the help of a long-handle wrench with a socket, loosen the bolt or nut. If you find that the bolt is rusted or stuck, use some penetrating oil and try again after a few minutes. Use a metal pipe over the handle of the wrench to get more leverage when loosening a stubborn bolt.

Once you remove the retaining bolt or nut, remove the mower blade and remember which side of the mower blade faced downward. This identification is essential to make sure the blade gets installed back in the same position. Use a permanent marker to mark the side that you need to remember.

Cleaning and Positioning

After you remove the blade, spend some time inspecting and cleaning the underside of the deck with the help of a knife with a narrow blade. Make sure all mud, grass, leaves, and debris are removed from it. Use penetrating oil and a stiff-bristle tool, such as a brush, and clean the two sides of the blade.

Mower blades generally have a cutting edge on both ends located on opposite sides of the blade. These cutting edges are only 3-4 inches long and don’t extend the blade’s length. So, you can clamp the mower blade in a vise in an angular position with any one of the cutting edges facing upwards.

Blade Sharpening

Get a blade sharpener that works with a drill to sharpen your lawnmower blade. This tool has an abrasive stone, a steel shank, and a flat sharpening guide. The surface of the stone is beveled and grinds the right cutting angle for the blade.

To use the sharpener, chuck the stone into the drill and wear safety glasses. Power the drill machine on and operate it at the maximum speed. Now, place the sharpener over the edge of the mower blade. You should ensure that the dull side of the blade rests against the stone’s beveled surface, and the flat surface faces the back of the blade. Move the stone back and forth slowly with medium pressure along the cutting edge. Check the blade’s sharpness after 4-5 strokes. Repeat the step if necessary until the blade appears sharp. Then, take the blade off the vise and turn it to begin sharpening the opposite edge.

Balancing and Reinstalling

Once you have sharpened both the cutting edges of the blade, the next step is to balance it. When you sharpen the blade, there are chances that more metal is removed from one end as compared to the other, and you get an unbalanced mower blade. Using such an unbalanced blade for mowing can result in excessive wobbling, thus damaging the motor and putting unwanted pressure on the mower.

There is a great way to check if a mower blade is balanced. Slip the center hole of the blade over a nail on a wall. Keep the blade in the horizontal position and see if it remains level. If one end rotates down towards vertical, you can determine that it is unbalanced. In this case, you can consider sharpening the heavier side to remove extra metal and retest it to get a balanced blade.

Balancing a bladeThough this nail technique works and is a simple method, you can use a mower blade balancer for more accurate results. It is a cone-shaped, multi-tiered metal fixture that can be placed on a flat surface with a blade set on the top. This tool works with a blade with a varying diameter of center holes. When you use a balanced blade, it remains level; otherwise, it tilts towards either side, indicating the heavier side of the blade that needs more sharpening.

Once you sharpen and balance the blade, reinstall it into the original position on the mower and tighten the bolt. Use a wrench to ensure to tighten the bolt snugly. Attach the wire again, fill the gas tank, and put your freshly sharpened mower blade to test.

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