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Heat Treating and Metallurgy Discussion of heat treatment and metallurgy in knife making.

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  #1  
Old 03-31-2016, 05:55 PM
billgiles2 billgiles2 is offline
 
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Angry knife forge

I have built several single burner propane forges, and had no problems. I just built a two propane burner that is 4" h x 4" w x 20" length on the inside. I can't get the center of the forge to heat metal, even though the thermocouple I installed at the top left corner in the middle says the temperature is 2100 degrees. The burners, when I pull them out and adjust them look fine. I am not sure if the inside diameter is too small or not. The first burner is installed at 7" from the operator opening, and the second burner is installed at 7" from the rear of the forge. The gap between the two burners is approximately 10". If anyone has a recommendation, I would appreciate it. I'm about to try installing another burner at the center position.
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  #2  
Old 03-31-2016, 06:53 PM
jmccustomknives jmccustomknives is offline
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Your burners are way to far apart for the size of the forge. You should have 3 burners for that length.
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  #3  
Old 03-31-2016, 08:26 PM
billgiles2 billgiles2 is offline
 
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knife forge

Thanks, I thought that was probably the issue, but I've seen others advertise 2 burners on forges that size. I'll give it a shot.
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  #4  
Old 03-31-2016, 09:23 PM
Doug Lester Doug Lester is offline
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Also with a square chamber you aren't having as much swirling of burning gasses as you would in a round chamber. This will promote hot spots in the forge.

Doug


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  #5  
Old 03-31-2016, 10:41 PM
billgiles2 billgiles2 is offline
 
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I had to make this one square because I had a free sheet of thermoboard. I probably would have been better off putting a slight angle in my burner mount. I have a few 5 gallon propane tanks that I converted to single burner forges that work great, but limit me to about 10" of length. I'm retired so i have plenty of time to play around. I found a 8" hydraulic cylinder in my garage and am building a tool for putting fullers on my knives without using a hammer. Thanks again!
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  #6  
Old 04-06-2016, 06:34 AM
tattooedfreak tattooedfreak is offline
 
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Just put a pass through on the other end of your 10" ones. You'll only work on less than 10" at a time anyway, no matter how big the blade you are making.
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  #7  
Old 04-06-2016, 11:19 AM
billgiles2 billgiles2 is offline
 
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Do I heat treat and quench 10" at a time too?
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  #8  
Old 04-06-2016, 12:12 PM
Doug Lester Doug Lester is offline
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With working the blade back and forth through my gas forge, which is only 7" deep, I can easily heat a 10" knife blade for heat treating. It also helps avoid over heating the tip by sticking it out the back end of the forge while the thicker back in of the blade heats. It's all in the technique.

Doug


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  #9  
Old 04-06-2016, 12:36 PM
billgiles2 billgiles2 is offline
 
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Thanks
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Old 04-06-2016, 08:55 PM
jimmontg jimmontg is offline
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Indeed thanks.

I am thinking about making a 3" round forge about 12" long and now I'm thinking 9-10" will be OK. Thanks for the (pun intended) TIP.

Last edited by jimmontg; 04-06-2016 at 08:57 PM. Reason: mispell
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angle, back, bee, blade, building, burner, degrees, forge, hammer, heat, heat treat, hot, knife, knife blade, knives, make, making, metal, mount, small


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