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).
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.
This project is also a good opportunity to check your oil and change it if necessary.. . Another way to sharpen a lawnmower blade is to use a belt sander
3 Methods to Sharpen the Blade. When you're sharpening your lawn mower blade, the goal is to make the blade as sharp as a butter knife. A flat file is an easy tool that'll sharpen a dull blade (with the blade secured in a vice.) The fastest way to sharpen a lawnmower blade is with a bench grinder.
Sharpen the blades of your lawn mower to keep it in good working condition. This Old House has the advice you need for sharpening lawn mower blades.
Sharp blades cut cleanly, giving your lawn a manicured look. How to sharpen lawn mower blades to keep you equipment running smoothly and your lawn .