I have ground a small blade about 2 inches long from O1. Today I tried to harden it using a soft fire brick w/ a hole through it and one from the side. I was using MAPPS gas for fuel. The blade didnt get hot enough, and the brick cracked through the center. The chamber of the brick didnt seem to get hot enough, but I only let it heat for about 5 or 10 minutes. What am I doing wrong? Will this set up be sufficient, or do I need to try something else? I'd like to be able to harden up to 5 inch blades. If this setup can work for the 2" blade, will it handle 5"? Assuming I did something wrong on the first try and the whole setup will not have to be scrapped. Thanks for any help.
PS: I read some of the search items, and people said their one brick forge worked great. I'm just a tad frustrated, and dont know where to begin to fix it.
PS: I read some of the search items, and people said their one brick forge worked great. I'm just a tad frustrated, and dont know where to begin to fix it.