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Post by Deleted on Oct 19, 2007 4:29:38 GMT
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Post by Dan Davis on Oct 19, 2007 12:38:02 GMT
Sam, Damn nice forge welds. Fold that sucker a few times next time around. Just one note:
As you look at the second pic where the skin has become much thinner than the core, it looks as if you are drawing out the skin and the core unequally. In real terms this can mean that when you forge and grind the blade you run the risk of completely removing the skin and exposing the core steel unevenly.
By using a heavy cross-pein hammer to indent the steel all the way into the center on both sides of the billet before drawing it out you can get the skin and the core to move evenly and avoid these potential problems. Of course, you have to stagger your peining from side to side to prevent chopping the billet in two.
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Post by Deleted on Oct 19, 2007 12:59:35 GMT
Thanks, in a coal forge no less either! It still will be forged to shape quite close, so the material will be moved more that way. And the thinner outsides is just due to the mild steel moving much better than the 1075, and some material loss also most likely, along with some carbon moving into the mild steel no doubt causing it to etch darker. I don;t cross pein to shape any part of any blade unless i am drawing the billet out. I'll fold a billet when it has two worthwhile mixable steels, this one would result in low carbon, and it is much better as is with slightly no carbon diffusion so it still will have a hard core with the softer sides to support it, which is the essence of san mai.
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Post by Matt993f.o.d on Oct 19, 2007 16:22:38 GMT
You've done it now. Now you HAVE to make a katana.
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Post by Dan Davis on Oct 20, 2007 10:52:44 GMT
Thanks, in a coal forge no less either! It still will be forged to shape quite close, so the material will be moved more that way. And the thinner outsides is just due to the mild steel moving much better than the 1075, and some material loss also most likely, along with some carbon moving into the mild steel no doubt causing it to etch darker. I don;t cross pein to shape any part of any blade unless i am drawing the billet out. I'll fold a billet when it has two worthwhile mixable steels, this one would result in low carbon, and it is much better as is with slightly no carbon diffusion so it still will have a hard core with the softer sides to support it, which is the essence of san mai. Ah. I hadn't realised the billet was already drawn to full size. It makes sense now.
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Post by Deleted on Oct 21, 2007 0:48:47 GMT
Oh whoopps Dan, forgot to mention hehe:). Matt, i have made a mono steel one, does it count?
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