![]() As the temperature goes up it will become less and less magnetically attractive. It can be difficult to judge this by eye but there is an excellent way to know when the temperature is right. It needs to get to about 1450 -1500 degrees F in order to harden. Now get your blade up to red orange hot and monitor it along the way. Once your poker or piece of steel is red hot you stir that into the oil to warm it up. Just be safe, there will be some flaming and you should always have the right kind of fire extinguisher on hand. It can be new or used motor oil or some kind of cooking or vegetable oil. Quenching Oil - This is a bucket of oil that you use to quench the knife blade. This long piece of steel is so you can bring up the temperature of your quenching oil. Put your knife and a poker or some long piece of steel. So, Either use a torch or crank up the forge! What this accomplishes is a softening of the back edge which gives us some bend and resiliencey while maintaining a hard edge which will keep the sharpness of the blade. And the wheat part has been heated to about 450 degrees F. The blue shows that part has been heated to around 600 degrees F. How this is done by heating with a torch or placing near the fire so the back edge is closest. ![]() This is what you are shooting for when you temper. And the cutting egde of the blade is wheat colored. The back of the blade (non cutting edge) is blue. Although the picture isn't the greatest, you will still get a good sense of the tempering. The following picture and graphic will give you a good understanding of what we are trying to achieve with tempering. And then you selectively temper part of the blade. So, you harden the entire blade, with no worries about the tang. Yes, but when you temper it you only temper it somewhat and some areas you want softer than others. So you temper it which is a softening of it. It won't endure the demands of knife use. Hardening it brings it up to a very hard state, but in this state the blade is too brittle. You have to harden it first and you have to temper it second. When you are making a knife from raw steel like this there are two things you have to do to the blade. You just need to know a few things to get it right. A lot of the other work like the filing and rasping will take you a few hours of work but this is a snap. This is the part that most people find is the biggest obstacle but in reality it is quite easy and will only take you an hour. If you came directly to this page you can start the tutorial right here: How to Make a Knife Part 1 In this part we harden and temper the blade. This is part 4 of the knife making tutorial. My name is Will and if you have questionsĬontribute projects or ideas you can contact me Knife making by the stock removal method Part 4 - Hardening and Tempering the Blade Some do's and don'ts from a first time knifemaker.How to Make a Sword - an overview of the process.
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