Reply by Tim

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Posted on Router Plane Blades

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3859 posts in 3414 days

#1 posted 10-30-2013 01:03 PM

I’ve ground two allen keys for router plane blades. You can tell by the sparks that come off the grinder when you grind them how good the steel is if you know how to tell the sparks apart. There’s pictures of the different spark patterns you can find online I’m sure. You can also just tell by how it takes to the grinder and how hard it is. People say allen keys are mostly good tool steel as far as a router plane blade goes.

I will say that grinding an allen key is barely worth it. Only do it if you’re broke or a cheapskate like me or it seems like fun. It took a long time to get them ground down without burning the steel. Had to stop and keep dunking them in water. You have to grind a flat all along what becomes the bottom of the blade and it’s a fair amount of metal to remove, especially for a 3/8” or something allen key that becomes a 1/2” wide blade. Then you have to grind the bevel. Maybe if you’re better with a grinder you could do it quicker than I did.

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