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Hey there. I am absolutely crash-coursing into forge making and metal working. I've gone through several crude forge designs and worked up to my current concept, that is a bit ambitious. I am having an absolutely ridiculous time getting by burners working properly. I am going to attach pictures to show what I have going on. Basically I have a 36" can lined with fire brick and refractory cement, that part holds heat so well! Then I use a 20# tank, low pressure regulator off of one of those tank-top heating burners, 3/8 OD hard copper lines, going to .35 MIG tips for burners. I have tried anywhere from 1 to 6 burners, different amounts of air holes in the 'venturi' area. So many things. Last night, with this setup I had two burners spaced about 5" apart working quite well. Finally all blue flames. But it's very temperamental and seems to end up choking itself out. When they work, they work well - but it's only in tiny spurts of good fortune. They definitely seemed to be running way too lean, and I increased the venturi holes by 400% and that is what really set it running better than ever. The second burner from the entrance chokes back too much though, and basically was only heating steel red-hot under directly under the first one. Running only one burner seems to just be too much gas. Two works the best. Should I have a flare on the end of the tubes? I've seen mixed things about this. Do I need to open up the back end of the forge... with more than 2 burners, and even with two sometimes there is excess fuel going into the chamber, and will sometimes choke out the flame. My main concerns at this point are should I have flares on the ends, and is it reasonable to think I need to knock a brick out of the 'back' wall to keep back pressure from building up in the chamber. Please help! I've wasted hundreds of $ already on parts through my trouble shooting and I'm admitting defeat. This is just way too complex to simply teach myself like many things I've done.