Lawn Mowers, Carburetors & String Trimmers

What is the proper blade rake angle when sharpening a rotary lawn mower cutting edge with an angle grinder or file?

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 Correct IncorrectApproximately a 30 to 35-degree bevel, leaving a 1/32" blunt flat edge. A razor-sharp edge can roll over and dull quickly on contact with small pebbles.

What is the proper blade rake angle when sharpening a rotary lawn mower cutting edge with an angle grinder or file?

• A durable 30 to 35-degree bevel with a blunt 1/32-inch land to resist nicking
• A hollow concave grind
• A 90-degree square edge
• A razor-thin 10-degree surgical bevel