On 05/10/2014 04:15 PM, gonjah wrote:
On 5/6/2014 11:49 AM, wrote:
On Tue, 06 May 2014 09:14:36 -0400, "(PeteCresswell)"
wrote:

Per Jon Danniken:
I used a 6" bench grinder, and no blue either.

My blades are time consuming to remove/replace so I've gone over to a
little attachment to my Dremel tool: turn the mower on it's side, run
the Dremel... and it's done.

But next time I am going to finish off with a light pass perpendicular
to the edge to give it that flat area that Clare mentioned.
The "square" edge effectively provises 2 curring edges.


Mine must not be very "hardened" because I simply run the gas out and
take the spark plug out. Then I take an old hand file and run over the
blade a bit. Seems to work just fine. I probably should balance it but
I've never used anything other than a hand file. I used to take the
blade off, but it just seemed like a waste of time.

The last thing you want is a hardened mower blade, as it would be too
brittle to be run safely at the speeds a mower blade is run at.
Instead, it is designed to deform when it strikes an unexpected item,
instead of sending chunks hither and yaw.

Jon