Mower Blade Sharpening Bench Grinder. Turn on the bench grinder. And the answer is usually, with a bench grinder.
But, depending on the design of your mower, you might be able to sharpen the blade without removing it, which will save a considerable amount of time.
Similar to the process above, using a bench grinder to sharpen lawnmower blades works just as easily. The diy experts at stack exchange offer a i don't own a bench grinder, but i have used a metal file, and a cordless drill with a grinder tip. Examine the blade and decide if it is better to sharpen it or replace it. A bench grinder has a grinding wheel that is spun at a very high speed.