Sharpening by Hand. Clamp the blade securely at your work station. Using a vise or a sturdy clamp, secure your lawnmower's blade in a way and place that makes it convenient for you to work on it. Sharpen the blade with a file. Follow the angle of the factory bevel as you sharpen. Reinstall the blade when sharpened.
Mulching blades may have longer or curved cutting edges, and you may need several types of files to sharpen them. In some cases, you may have to resort to a 4-1/2-in. angle grinder to sharpen mulching blades. If your mulching blade is too difficult to sharpen, take it to a hardware store or a blade sharpening service.
To sharpen your lawn mower blade, you'll need a socket or wrench to fit the blade nut. Tough nuts may call for a breaker bar and/or a penetrating lubricant. You'll also need two clamps, a block of wood and, of course, an angle grinder with a metal grinding blade. Start by disconnecting the spark plug wire (Photo 1).
Sharpening a Lawn Mower Blade: This instructable will lead you step by step to. If put on the incorrect way it will not function properly or damage the mower
This instructional article tells readers how to sharpen a rotary mower blade. It details in steps how. There is no technical mystery to sharpening a lawnmower blade.. The primary goal is to consistently maintain the correct angle on the blade.
This Old House has the advice you need for sharpening lawn mower blades.. Roger Cook shows homeowners the proper way to mow a lawn. In this how-to .