Seems like that would reduce your oxygen intake and defeat any gain you would get by preheating.
The Sandia forge routes the exhaust gasses out the top with the burner tubes routed through the exhaust gasses to preheat the intake for high efficiency. It's nice that the exhaust goes up, away from the smith, but the big drawback IMO is that the arrangement precludes a pass through door for longer projects. I personally don't like working with this design.
It's a heat exchange affair, so the exhaust gas is kept out of the intake.Seems like that would reduce your oxygen intake and defeat any gain you would get by preheating.
Oooops, I just got back from there.Photos?
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It's a heat exchange affair, so the exhaust gas is kept out of the intake.
Last Friday I was working on a pair of tongs to hold 1" square or round. My neighbor stopped offer to deliver a piece of our mail that he had found in his yard. We talked for a while and he watched me working on the tongs. He said that he had a 200 lb Hay Budden anvil and a blower. I told him what I thought they were worth.
After I finished the tongs I brought them over to his house to show them to him, and for me to see his anvil. When he came to the door he told me he had been watching forging videos since he got home. We talked for a while and then I asked to see the anvil. It was in good shape and I told him it would be best if he set a price on it that I could tell people, and he said "Well now I'm thinking of using it"!
I did not even think of inviting him to the open forge the following day, which I feel really stupid about now. That would have for sure hooked him.
Yesterday I finished my fire tools and two new 'Moai' bottle openers.
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The Wootz that Bruno uses is the modern production of real 'Damascus' steel. The carbide arrays give the steel that watery look that people tried to duplicate with PWS [pattern welded steel]. PWS has incorrectly become known as Damascus because of this. There is a very good video on the production of true Damascus steel here;
It's still unclear to me what causes the carbide arrays. I used to think that it was dendretic, but that video seems to dispel that.So basically, "true" wootz is mainly just the alloys in the ore. It is in theory the same as any crucible steel, and pattern welded through the constant thermo-cycling.
Maybe not.... Is that what he's doing with the thermo-cycling after every heat/movement? Allowing it to restructure constantly making the dendric formations and the pattern?It's still unclear to me what causes the carbide arrays. I used to think that it was dendretic, but that video seems to dispel that.
To avoid derailing the other thread.
That's a great video. Thanks for showing that.
So basically, "true" wootz is mainly just the alloys in the ore. It is in theory the same as any crucible steel, and pattern welded through the constant thermo-cycling.
Kind of like "true" tamahagani is reliant on the alloys in the black sand it's made from.
That was actually Victor that posted that Matt. I just re-posted here to talk about the process without derailing the other thread.I really enjoyed that, thanks for sharing.
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He said that the thermocycling was for grain size reduction. I do a bit of this at end of the forging of my blades and again at the heat treat. Forging typically reduces grain size by itself because the grains are mechanically elongated with the hammer and then reform into smaller grains in the transition.Maybe not.... Is that what he's doing with the thermo-cycling after every heat/movement? Allowing it to restructure constantly making the dendric formations and the pattern?
Yeah, you're right. My brain was on a different track.He said that the thermocycling was for grain size reduction. I do a bit of this at end of the forging of my blades and again at the heat treat. Forging typically reduces grain size by itself because the grains are mechanically elongated with the hammer and then reform into smaller grains in the transition.