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Ed Caffrey's Workshop Talk to Ed Caffrey ... The Montana Bladesmith! Tips, tricks and more from an ABS Mastersmith. |
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#1
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Damascus Blade Warp
Ed,
Well I work the damascus billit into a blade. When I went to harden about 1 inch from the tip pulled to the left. I went ahead and harden twice more. Then three cycles of tempering. Tried to straighten the with the brass pins. No go just flexed right back. My question is should I quench starting with the tip first and roll the rest of the blade slowly in to the oil. I did a full blade quench as per your Basic damaccus video. Bing |
#2
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HI Bing!
My first thought is "did you normalize the blade after you rough ground it, and before you quenched"? Also, if the blade had a fast taper, with a fairly thin tip (or front 1/3 of the blade length), chances are good that the heat was uneven. I try to leave blades fairly thick prior to quenching, and am satisfied that the normalizing (heat to approx 1300-1350F, and allow to cool in still air) prior to quenching eliminates about 99% of any warpage. I'm just throwing out possibilities right now. Without knowing exactly what you did to the blade, and how it looks, I can only think back to the errors I made and tell you the causes of mine. If none of this sounds like it might have been factors, then lets get into it a little deeper and maybe we can determine the problem(s). Merry Christmas Pal!! __________________ WWW.CAFFREYKNIVES.NET Caffreyknives@gmail.com "Every CHOICE has a CONSEQUENCE, and all your CONSEQUENCES are a result of your CHOICES." |
#3
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Ed,
Probably more than one problem after reading your response. Tip was fairly thin about .065 to .070. (With straight steels I normaly try to keep them about .070 to .090). I was a little limited with material on the damascus. Also I might add when I quenched my oil was at 130 Deg. I also put edge first in the quenching oil. I did put the blade in fast. Normalized the same as I do straight steels. Maybe I should normalize more than one cycle after rough grinding I have one more billit left to play with. I will leave more material when rough grinding next time. I will let you know how that goes. Gives me next weekends challenge Merry Christmas to you and yours. Bing |
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blade, knife |
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