How to Sharpen the Lymow One Plus Blade

Maintaining a sharp blade on your Lymow One Plus is the single most important thing you can do for the health of your lawn. However, most people sharpen their blades incorrectly, leading to frequent chips and a dull cut within weeks. In this guide, we’re going to cover the industry-standard method for sharpening your Lymow blade using a hand file to ensure a durable, long-lasting edge.

Lymow Blade Sharpening Video

Why the Sharpening Angle Matters

One of the biggest mistakes DIYers make is sharpening their mower blade at a very flat angle to make it “razor sharp.” While this might feel sharp to the touch, a thin, flat edge is extremely fragile. When a flat-angled blade hits a small pebble or even a thick weed, it is much more likely to suffer from:

Chips and nicks in the metal.
Rolled edges that stop cutting and start tearing the grass.
Frequent sharpening intervals, which wears down the blade faster.

To get the best performance out of your Lymow One Plus, you should follow the industry standard of a 30 to 45-degree angle. This creates a “working edge” that is sharp enough to slice grass cleanly but thick enough to withstand the impact of debris.

Hand File vs. Angle Grinder

It is tempting to grab an angle grinder to get the job done quickly, but I highly recommend using a mill bastard file instead.

Heat Control: Angle grinders generate immense heat. If the metal gets too hot (turning blue), it loses its “temper” and becomes soft, meaning it will never hold an edge again.
Precision: A hand file allows you to maintain that 30-45 degree angle perfectly without removing too much material.
Balance: It is very easy to grind too much metal off one side with a power tool, throwing the blade out of balance and causing vibration that can damage your mower’s motor.

Step-by-Step Sharpening Guide

1. Safety and Removal

Before you begin, ensure the Lymow One Plus is powered down and the safety key is removed. Use a socket wrench to remove the blade bolt. Pro tip: Mark the “grass side” of the blade with a piece of tape or chalk so you don’t reinstall it upside down!

2. Clean the Blade

Use a wire brush or putty knife to scrape off dried grass and debris. You cannot get a clean edge if the file is jumping over old mulch.

3. Set Your Angle

Secure the blade in a vice. Position your file at a 30 to 45-degree angle relative to the flat face of the blade.

4. The Filing Motion

Push the file across the edge in one direction—away from your body. Do not saw back and forth. You only need to remove enough metal to reveal a clean, shiny surface and remove any minor nicks.

5. Check the Balance

Once sharpened, place the blade on a balancer. If one side hangs lower, file a little more metal off the back edge (not the sharp edge) of the heavy side until it sits level.

6. Reinstall

Bolt the blade back onto your Lymow One Plus, ensuring it is torqued to the manufacturer’s specifications.

Summary for Success

Avoid the Angle Grinder: Use a hand file to preserve the metal’s temper.
Stick to 30-45 Degrees: Don’t go too flat, or you’ll be sharpening again next week.
Balance is Key: A balanced blade protects your mower and gives a smoother cut.

By following these steps, your Lymow One Plus will provide a cleaner cut, leading to a greener, healthier lawn and a mower that lasts for years to come.