how to sharpen mower blades with bench grinder

How to Sharpen Mower Blades with Bench Grinder – The Safe, Easy Way

Are you tired of mowing the lawn and having to sharpen your mower blade multiple times? If so, you’re not alone! Mower blades wear down over time, which can dull the blade and require sharpening. This guide will teach you how to sharpen mower blades with bench grinder safely and easily. By following the steps outlined, you’ll be able to keep your mower blade sharp and ready for next time without any Hassles! So what are you waiting for? Give this guide a try today!

How to Tell if Your Lawnmower Blade Needs Sharpening?

how to sharpen mower blades with bench grinder

Before you start sharpening your lawnmower blade, it’s important to determine if the blade is actually dull or just needs a little TLC. There are a few ways to tell if your mower blade needs sharpening:

  • The lawnmower may not be cutting the grass properly. The blades will need to be sharpened if they aren’t inflicting enough damage on the grass.
  • If there is rust buildup on the blade, it’s time for a tune-up and/or new blades! This can happen from wet conditions or overusing the lawnmower.
  • The blade may have nicks and dents on it, which is a sign that the blade needs sharpening.

If one of the above indicators applies to your lawnmower blade, you’ll need to take the necessary steps to sharpen it properly before mowing again!

Why Sharpen Your Lawn Mower Blade?

how to sharpen mower blades with bench grinder

Sharpening your lawn mower blade will not only ensure that the blade is cutting the grass properly, but it can also shorten the life of the mower. Over time, a dull blade can wear down faster and cause more damage to your lawn than a sharp one. Not to mention, nicks and dents on the blade can easily lead to blade failure.

How to Sharpen Lawn Mower Blades With a Bench Grinder?

how to sharpen mower blades with bench grinder

Bench grinders are much safer than hand grinders because they use rotating discs instead of spinning blades. This makes them much less likely to cause damage or injury. Additionally, bench grinders are much faster and easier to use than hand grinders, making them ideal for quick repairs or maintenance tasks.

Tools Required

These variety of tools are necessary to sharpen lawn mower blades with a bench grinder:

  • Bench grinder
  • Sharpening motor oil (optional)
  • A wrench
  • Protective eyewear
  • A vise
  • A pair of welding gloves
  • Lubricant
  • Plastic balancer

Step-by-step Procedure:

Steps required to take in order to sharpen lawn mower blades with a bench grinder:

Step 1: Turn the Machine Off

Before beginning the sharpening process, it is important to turn the lawn mower off. This will prevent any accidental cuts while sharpening the blade.

Step 2: Remove Blades from Mower

To sharpen blades on a bench grinder, you first need to remove them from the mower. On some models of lawnmowers, this may be as easy as pressing a button or turning a bolt; on others, you may need to take apart the mowing deck entirely. Whichever method you use, make sure that all of the blades are removed before starting the sharpening process.

Step 3: Place the Blade on the Bench Grinder’s Sharpening Plate

Now that the blades are removed, it is time to place them onto the sharpening plate of your bench grinder. Make sure that the blade is facing forward and keep it securely in place with a wrench or vise. Depending on the model of bench grinder you’re using, there may be one or multiple sharpening plates available. Be sure to use the correct one for your blade type and size.

Step 3: Prepare the Blade for Sharpening

Before sharpening the blade, it is important to lubricate it. This can be done by applying a small amount of sharpening oil onto the blade or power grinder wheel. Use a plastic balancer to ensure even pressure as you sharpen the blade.

Step 4: Sharpen the Blade using Corners and Angles

Once the blade has been lubricated and properly prepared, start by sharpening its corners using a coarse grit stone. Work your way up to finer grits if necessary. Don’t forget to use correct angles when sharpening lawn mower blades; doing so will give them the optimum cutting edge.

Step 5: Cool the Blade

Once the blade has been sharpened, it is time to cool it down. This can be done by placing the blade onto a water-cooled grinder wheel or using a metal cooling block. Make sure that the blade remains cool until you are ready to use it again.

Step 6: Balance the Blade

If the blade feels unstable when in use, it may need to be balanced. This can be done by adding weight to one side of the blade using a wrench or vise.

Step 7: Clean the Blade

Once the blade has been balanced and cooled, it is time to clean it. Use a wire brush to remove any burr or sharp edges from the blade.

Safety Tips

It’s essential to ensure that you are using the correct sharpening stone and angle for the blade type and size. Follow these safety tips to keep yourself safe while sharpening lawn mower blades:

  • Always wear safety glasses for eye protection and gloves when sharpening blades.
  • Use a metal cooling block or water to cool the hot metal blade before use.
  • Be sure to keep the blade balanced while sharpening it.
  • Never use the grinder on wet blades.
  • Always use sharpening oil on the blade before grinding.
  • Be sure to clean the blade after each use.
  • Try to avoid applying too much pressure, as the blade may get damaged.
  • Take breaks when sharpening and use ear protection.
  • If the blade is worn out, replace it with a new one.
  • To keep the blade secure on the bench grinder, utilize a sharpening jig.

Frequently Asked Questions

How do I know if my mower blade needs sharpening?

If your mower blade is not cutting the lawn as well as it used to, it might be time for a sharpening. Make sure that the blades are sharpened at least once per year. However, if you notice that the blades are becoming blunt quickly or they’re constantly catching on debris in the yard, then it may be time for a sharp blade.

Which type of blade is the best to use on a mower?

A blade is the most important component of a lawn mower and should be chosen based on its intended use. For instance, if you are using it for personal garden maintenance, then a grass blade flat would be appropriate. However, if you plan to commercially cut turf or vegetation, then an edger or trimmer blade may be more appropriate.

How long does it take to sharpen lawn mower blades using a bench grinder?

It can take anywhere from 5 to 20 minutes to sharp lawn mower blades using a bench grinder. However, the length of time will largely depend on how heavily used the blade is and what type of grinding wheel you are using. If you are just starting out, it may be best to use a softer wheel in order to avoid damage.


Keeping lawn mower blades sharp is important for keeping the blade in good condition and ensuring that lawnmowing is easier and more efficient. By following these instructions, you can easily sharpen your unbalanced blade using a bench grinder. Just be sure to clean the blade after each use and take breaks when sharpening to avoid damaging the blade.

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