Originally Posted by
David Weaver
The only issue with the trizact belts is that if there is a hard platen under them, they will burn steel very quickly - especially in something with the belt speed of a viel grinder. If there isn't a hard platen under them, then you'll get a convex edge. I've actually never used another tool that made the edge so hot so fast as a trizact belt with a hard platen under the belt
I actually like coarse grit belts on a belt grinder better if grinding is the purpose. The trizact belts work well if you are willing to tolerate the convex bevel, and are great for sharpening stuff like a knife that gets abused, or turning tools where the heat doesn't matter much.