Sharpening Lawn Mower Blades

[mqqn]

I was looking at the Magnematics... what to they suggest as far as: 1. removing the burr and 2. not overheating the blade.

It seems to me as if the blades probably aren't HT'd and tempered so that way they will be lower hardness in case they hit something hard. Does anyone know if this is true or not?

I can tell you that I have never seen a broken mower blade, just deformed / dented / bent blades.

That tells me that they are not hard, and common sense would also say that it is not prudent to make something very hard and potentially brittle that will be spinning at high speed.

We used bench grinders when I worked for the park district, and it is important to balance the blades. I will add that once again, since I don't see anyone else mentioning that aspect.

best

mqqn

 

[pjwoolw]

I believe they are designed to bend rather than break. I've seen some pretty twisted mower blades.