How to Sharpen Lawn Mower Blades With Grinder

| Updated On: March 26, 2023
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Sharpening lawn mower blades with a grinder is an easy process that can be done in just a few minutes. First, disconnect the spark plug wire from the spark plug to prevent any accidental starting of the engine. Next, place your mower on a flat surface and remove the blade by unscrewing it from its fasteners.

Use a clamp or vise to hold the blade securely in place for sharpening. Using a grinding wheel attached to your grinder, slowly sharpen both edges of the blade until they are even and symmetrical looking. Once finished, reattach your new sharpened blades back onto your mower and reconnect the spark plug wire before starting up again!

  • Step 1: Unplug the mower from any power source. Make sure that all moving parts have stopped spinning before you start your work.
  • Step 2: Remove the blade from the lawn mower using a ratchet and socket set. Place it on a flat surface for easy access.
  • Step 3: Secure the blade in a vise or clamp securely so that it does not move when sharpening with the grinder.
  • Step 4: Wear protective gear like eye protection and gloves to protect against flying debris from sparks during grinding process.
  • Step 5: Turn on your grinder and adjust its speed accordingly depending upon how dull or damaged is your lawnmower blade’s edge.
  • Firmly hold the grinder up against one side of your lawnmower blades’ edge, keeping it at an angle of 15-20 degrees while making sure to keep consistent pressure applied throughout entire sharpening process until desired results are achieved.
  • Step 6: Move onto other side of blade’s edge and repeat same steps as stated above until both sides are evenly sharpened according to preference and required specifications for cutting grass effectively with ease, safety, accuracy and precision.
  • Step 7: Use wet cloth or water sprayer to clean off any remaining debris after completing grinding process; then use file brush in order remove small particles left behind by grinder if necessary before taking next step towards putting back together again.
  • Step 8: Reattach newly sharpened blades back onto mower & make sure they’re secured tightly with nuts & bolts provided when purchased model originally.
How to Sharpen Lawn Mower Blades With Grinder


Can You Use a Grinder to Sharpen Lawn Mower Blades?

Yes, you can use a grinder to sharpen lawn mower blades. This process is relatively easy and inexpensive compared to taking the mower to a professional sharpening service. It requires removing the blade from the mower and clamping it securely in a vise for safety purposes.

You then need to attach an appropriate grinding wheel onto your grinder, making sure it is properly tightened before turning on the machine. Once running, you should make several passes along each side of the cutting edge with light pressure until you achieve your desired results.

After sharpening, be sure to thoroughly clean off any excess metal shavings from both sides of the blade before re-installing it back on your mower.

What Kind of Grinding Wheel Do I Need to Sharpen My Lawn Mower Blades?

When it comes to sharpening lawn mower blades, the type of grinding wheel you will need depends on a few factors. If your blades are made of high-speed steel, then an aluminum oxide wheel is best for sharpening them. However, if your blades are made from hardened or stainless steel, then you should use a silicon carbide wheel instead.

For optimal results, make sure that the grade and grit size of the wheel match up with the material used in your blade. Additionally, always follow safety precautions when using any kind of grinding equipment and wear appropriate protective gear such as goggles and gloves during operation.

What Angle Do You Grind Lawn Mower Blades?

The angle of the lawn mower blade should depend on the type of grass being cut. For a softer, finer type of grass such as Bermuda or Fescue, you may want to use a lower grind angle between 15 and 20 degrees.

For tougher varieties such as Rye or Bluegrass, you would likely want to increase your grind angle up to 25-30 degrees in order to get adequate cutting power through thick stems and roots.

Be sure not to go too high though; if the grind angle is too steep it can lead to issues with clogging. Ultimately, make sure you refer to your lawn mower’s manual for specific instructions regarding blade maintenance before making any changes or adjustments.

How To Quickly Sharpen A Lawn Mower Blade (With An Angle Grinder)

Best Angle Grinder Disc for Sharpening Mower Blades

An angle grinder is a versatile tool that can be used for many purposes, including sharpening mower blades. When selecting the best angle grinder disc for sharpening mower blades, look for one with a durable aluminum oxide construction and multiple grits to fit your specific needs.

Additionally, choose an angled grinder disc specifically designed for use on metal surfaces; this will ensure the highest quality results when sharpening your lawnmower blade.


In conclusion, sharpening lawn mower blades with a grinder is an efficient and easy way to keep your lawn looking its best. It only takes a few minutes to sharpen the blades, and once you get the hang of it, it can be done in no time. With just a little bit of knowledge and some basic tools, anyone can keep their lawn healthy and looking great all season long!

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