3 Best Bench Grinders For Sharpening Lawn Mower Blades

  • By: Carl
  • Time to read: 5 min.

Here are the 3 best bench grinders for sharpening lawn mower blades:

1. Jet 578008 1 HP 8 Industrial Bench Grinder

This is one of Jet’s best and most durable bench grinders for lawn mower blades. The Industrial built Jet 578008 is of high quality, and the power it carries to sharpen the blades of lawnmowers earns it the number one spot. The bench grinder is ideal for workshops and garages, and even though it’s a bit expensive, it offers value for money. It is known for its smooth grinding with its high-quality grinder. It also supports 115V to 230V, which helps lengthen the device’s life.


· 1 Horse Power

· Heavy Duty Capacity motor

· 36-60 Wheel grit

· Supports 115 to 230 volts

· 2 Year’s Warranty

· 3600 RPM

· CSA/CUS certified


· Offers great value for money

· Operates silently with low noise

· Dust Collector


· Quite Expensive

· Doesn’t come with LED light

· Absence of magnifying mirror for inspection of broken appliances.

2. DeWALT Bench Grinder, 8-Inch (DW758)

DeWALT is a brand with great prestige; it is one of the most amazing tools producing companies known. The DeWALT Bench Grinder is an extraordinary product with a Horse Power motor of 3/4. Its wheel runs at 3600 RPM, making it a wonderful tool for sharpening blades. Though there have been some complaints since its launch, the grinder is pretty decent with a good price attached.


· 120 volts

·3/4 Horse Power motor

· 36-60-wheel grit

· 4.2 Amp motor

· 3600 RPM


· Lasting cast iron base

· Very powerful motor

· Decent quality


· Some users complain of wobbliness

· Only comes with single speed

· Doesn’t come with LED light

3. JET 577102 JBG-8A 8-Inch Bench Grinder

The Jet 577102 is of pretty great quality. Compared to the Jet 578008, it has an RPM of 3450, which is pretty low and not great quality, but its 1 Horse Power motor can get the job done. This bench grinder was made a consumer-grade model, and so it comes with a lower price compared to the Jet 578008 bench grinder. But when compared to other bench grinders, it seems to be a bit pricey even for its smooth and powerful motor.


· 3450 RPM

· 36-60 Wheel grit

· 1 Horse Power

· 2 Year’s Warranty

· 115 Volts


· Good Quality

· A bit cheaper than the Jet 578008 model

· High Performance


· Complaints about vibration, but can be repaired

· No LED lights

· Not portable

Why Sharpening Lawn Mower Blades are Important

There are some valid reasons why keeping your lawnmower blades sharp is important. They are;

· Greener/Healthier Grass: A sharp blade gives you a steady and even cut, which will make your grass less susceptible to disease and keep your grass clean and healthy.

· Less Electricity/Gas Consumption: A blunt blade struggles harder and ends up tearing the grass instead of cutting it. This will make the lawnmower consume more fuel and produce little or no results.

· Less Energy Usage: With a sharp blade, your mower will smoothly glide over the lawn and spend far less energy in getting the work done.

· Easy To Use Mower: Your mower becomes much easier to use, gives a finer and quicker cut, and works efficiently. So, there’s no need to suffer from a dull blade.

How to Sharpen Lawn Mower Blades with a Bench Grinder

These steps have been made easy, so sharpening your lawn mower blade shouldn’t be a hard job for you.

1. Safety

Start by removing the spark plug (from electric and gas-powered lawnmower). This will help you avoid an accident. Then, make sure your carburetor is facing upward while you to your lawnmower. This hinders oil and gas spills. By performing this, your work area has become a whole lot safer.

2. Blade Removal

Wear a pair of gloves, as even a blunt blade can still be harmful. The safest way to remove the blade is by jamming a piece of 2 by 4 in between the blade and the housing of the lawnmower. This will help keep your hand safe while holding the blade and unscrewing the nut. If the nut is extremely rigid, you can spray a small amount of grease and let the oil soak in before unscrewing the nut again. While removing the blade, please take note of the bottom side, as this will help you fix it correctly.

3. Clean the Blade

You can use a piece of rag or soap and water to clean up the blade, so you can see if there’s damage to it. If the blade has been damaged, there’s no need to sharpen it, and a new one should be purchased instead. When you buy a new blade, show you know the side that faces up and the side that faces down.

4. Sharpening the Blade

Ensure you wear a face or eye mask, protective cloth, and gloves to protect you from sparks and flying metal. Turn on the bench grinder and confirm the blade is held the right way. Place the blade at the proper angle against the grinding wheel, and move back and forth continually. Do not change the angle when sharpening, and keep your hands steady.

5. Cooling the Blade

While the blade is being sharpened, the wheel will heat it during the process. You need to keep the metal cool so as not to ruin the process or hurt yourself.

6. Balancing the Blade

You’ll have to steady the wheel to have a good cut. The simplest way to do that is to place a big nail in a vise horizontally. Then position the nail through the blade, using the bolt hole. When you have done that, check the blade again. There will be more metal on one side than the other. When you have confirmed which side has more metal, place the blade on the bench grinder again and remove the surplus metal. You may need to repeat this step.

7. Returning the Blade

You can repeat the same procedure you used in removing the blade, but this time in reverse order. Place the wood block again, and make sure you have the right sides facing up and down correctly. Try not to over fasten your nut as this might become difficult to remove the next time you need to sharpen the blade. Moreover, you shouldn’t make the nut too loose, or you may hurt yourself and destroy your mower when the blade falls off.

Tips For Sharpening Lawn Mower Blades

1. Your blades should be very sharp, but not like a razor. Popular belief claims a razor-sharp lawn mower blade will cut grass better, but that is not true.

2. Constantly sharpen your blade from the top side of the cutting edge; this will help it last longer.

3. Avoid cutting wet grass as this can make the blade blunt more quickly. If you use your lawnmower in cutting wet grass, then clean it thoroughly after mowing to keep it sharp.

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