AxL

I did run into a sort of snag. The lathe in the machine shop was reserved for our apprentice taking a test all of last week, so I couldn't remove the piece he was working on from the lathe. But I will get started today, and hopefully have some pictures for you this week! I plan to turn a bolt on the lathe, to make it fit snug inside the reducer and then just drill out a 1/2" hole in it. Hopefully I can find a 1/2" broach to make it nice and smooth. Otherwise I'll hit it with some sandpaper. Updates to come!

Not done yet sadly! Have been busy, but as far as I can tell I have all the materials I need available. Can't wait! Thanks for taking the time Mikey, I'll try my best to follow your instructions to the letter. Hopefully I'll have some pictures next week:)

Thanks Mikey, I really appreciate it! So if I understand you correctly, since the large end of the reducer is 2", the inner diameter of the tube i use should be 1/2" (for a 4:1 ratio)? And the length of the tube, by rule of thumb, should be 4.5"? I will likely turn the tube on a lathe to get the dimensions just right. I have different sizes of MIG tip available, in metric. 0.8mm (0.031") and 1.0mm (0.039") Not sure what it corresponds to in actual size. What would be you recommendation? I'm running approx. 2.2 psi/150mbar off my regulator. I'll try to get started on the construction tomorrow and come back with pictures. Thanks!

Thanks man! I have tried to find Mike's book online, but all I find are bogus sites full of stuff that makes my antivirus have a fit. If anyone has a link or can send me the pdf, that'd be great!

Hi! I'm new to this forum and trying to build myself a forge and a burner. Let me prefice this by saying I know I can buy burners online, but I want to build it myself. I'm not good on the terminology either, so forgive my ignorance, and please feel free to correct me when I get something wrong. I'm not going to forge with it (yet), it's just for heat treating steel. I can't find a good plan for a linear burner that doesn't include buying parts from a plumber supply shop. I live in Norway and we don't have a lot of stores with such supplies available (we're not big on DIY because of regulations preventing us from doing much ourselves). I do have access to a lathe and mill, and misc. tools and I can make pretty much anything if I need it. Also have access to pipes, steel stock and a fair amount of pipe reducers and such, used in the oil industry. Does anyone have plans/schematics for a linear burner that has all the ratios between pipe diameter, flare sizes etc? I have added a simple sketch of the kind of burner I wanna build so there is no confusion (not sure linear burner is the correct term). It's the kind used by Alec Steele in his forge. Like I said, I can make anything if I just know the correct ratios. I found a reducer today that I thought might make a good top flare, and start from there. The reducer (see pictures) is a 2" to 1" reducer (ID), about 2.5" long. The inner walls are the same shape as the outer walls, and to me it looks like it could be the right shape to create the start of a venturi tube. My regulator has a max rating of 150 mbar/2.2 psi. I can get a new one if it turns out to be too low. Any and all help is greatly appreciated!