The angle grinder + flap disk combo is the go-to recommendation from experienced lawn care enthusiasts for fast, controlled blade sharpening. Harbor Freight sells a capable combo for under $15, making it the best value-to-performance sharpening setup.
If you ask anyone who's been sharpening mower blades for years, they'll tell you to grab an angle grinder. It's faster than a file, more controllable than a bench grinder, and costs almost nothing at Harbor Freight.
“Go-to harbor freight, get a cheap angle grinder, and a flap disk. I got mine for $10 on sale.”
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“Did my own with the angle grinder a couple days later and took less time since it was evenly cut with the better control.”
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“I don't love using a grinder because it heats the metal and can cause weak areas... it's always best to do your final edge by hand for consistency.”
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