How to sharpen mower blades with an angle grinder
By My Yard Editorial Team · 7/28/2026
The Quick Answer
Maintain the factory bevel — usually 30–45 degrees — and stop at a butter-knife edge, not a razor. Then balance the blade; an unbalanced blade destroys engine bearings in a season.
The Witty Breakdown
A razor edge on a mower blade rolls over on the first stick. You want durable, not sharp.
Sharpen twice per season. Torn grass tips turn brown and make an entire lawn look sickly.
Step-by-Step Fix
- 1
Disconnect the spark plug and tip the mower with the carb side up.
- 2
Mark blade orientation before removal — reinstalling upside down is a classic.
- 3
Grind lightly along the existing bevel, keeping the blade cool.
- 4
Balance on a nail or blade balancer; grind the heavy side until it sits level.
Pro-Tip / Do Not Do This
Don't grind until the blade turns blue. You've burned the temper out and it'll dull in one mow.
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