Introduction

There are several good ways to sharpen lawn mower blades, but one of the quickest and easiest methods is with an angle grinder, an inexpensive, versatile hand-held power tool.

You wouldn’t take care of grass that’s too long by tearing off the end of each blade, would you? But that’s exactly what a dull lawn mower does, leaving the torn grass vulnerable to sun damage and disease. You could sharpen your mower blade with a file (it takes forever!), a rotary tool or a bench grinder, but we’ll show you how to do the job with an angle grinder. It’s fast and easy. If you don’t own a grinder, they don’t cost much to buy and can be used for all kinds of other tasks too.

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.