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Heat Treating and Metallurgy Discussion of heat treatment and metallurgy in knife making. |
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#1
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Upset w/ Texas Knife Makers heat treating.
Sent my first S90V blade to Texas Knife Makers for heat treating. Finished out knife, looks great by the way, and was in the process of selling it. My Dad works for Bell Hellicopter and has access to their hardness tester. It tested out to 44.8!!!!!???! He thought it might be a mistake. Tested it a few more times. All measurements were the same. He tested the calibration of the machine and it was dead on. So, do not send your blades to TKM. Who can I trust to do it right? Any suggestions would be appreciated.
Bryan |
#2
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First call: Back to who did it. Remember we are all human.
Do you mean Texas Knifemaking Supply? Texas 'Knifemakers' is painting a VERY broad picture on individuals. Coop |
#3
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Bryan,
Put the shoe on the other foot. If one of your customers was upset with you; wouldn't you want to know about it, and have a chance to make it right before they made it public? Also: In your shop, who's job is QC? Just some things to ponder......... Russ |
#4
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Bryan
I agree with the posts above you should always check to see if the problem can be solved with the people you have dealt with. Then if there is no results you have the right to be upset and make this public. Bob |
#5
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It sounds to me as if the steel may not have been identified correctly, either when you bought it or maybe not being clearly marked for the heat treater.
In any case, the heat treater should have checked the hardness himself and notified you about the error. In many cases, though, the steel is batch heat treated with a sample of the same steel, then only the sample is hardness checked. If this was the case, then the steel must have been mis-identified. |
#6
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Quote:
Stay Safe, A.T. __________________ "Many Knives by Many Makers" http://www.customknives.com "When seconds count, the police are only minutes away." Tom Gresham |
#7
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Quote:
I think I'll just make the 3 dots my trademark. |
#8
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Sorry I have not been able to check on my post. Things at the post office have been very busy and I pretty much eat, sleep, and work right now. Scratch the sleep part.
Ok...first, more clarification. I do not have a "shop", as in employees. I just do this as a hobby. Second, it is Texas Knifemakers Supply. Third, I know it is S90V because I ordered it from Crucible and picked it up at Crucible in Arlington, Texas. Fourth, I handed the blade to the gentleman at the Spirit of Steel show in Grapevine. I filled out some paperwork and he traced my blade on the back of the sheet so as not to get it mixed up with other knives. It was clearly marked on the paper as being S90V. We also briefly discussed the heat treating process and the temps required of S90V. I feel that even at 42.7 rockwell hardness, it will make a great knife. I ended up selling it to a friend of a friend, well under what I would have sold it for, who knows that it is only 42.7 rockwell. He didn't really care so long as he could carve up a few deer with it. Russ, TKS can not make it right. I enjoy their great attitude with customers and I will continue to order supplies throught them, but the damage is done and I will not trust them to do another heat treatment for me. My intention is to find out who can do it correctly so I can send my blades to them. Who is Paul Bos and how can I get a hold of him? Does he have a website? Bryan |
#9
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This doesn't smell right some how...
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#10
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I fail to understand why TKS can't make it right???????
Just guessing but at 44.8Rc I can't imagine S90v working out very well. |
#11
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I agree with Tracy and can't wait to hear the rest of this.
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#12
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Quote:
That makes me wonder if your Dad read the hardness tester scale correctly. I don't remember seeing a tester that reads in tenths of thousandths. There are usually 2 or or more graduations on a Rockwell tester dial. Could he have read the scale on the dial incorrectly? Could the preload weight have been dialed in to another rockwell reading rather than Rc? If the blade is only 45Rc, a file would cut it very easily. |
#13
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I too wondered about the .8 reading. Hmmmmmmm:confused:
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#14
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come on guys .8 is 800/1000ths. and the figure is on most all electronic hardness testers and most manual testers. 44.8 RC would be a fairly soft by modern standards for a knife blade,but 44.8 is a readable number on most testers.
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#15
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I was the "heat treat guy" at a machine shop where I worked. Everything I knew I learned from a machinist book on heat treating and Blade magazine. We had a Rockwell tester and it had another setting on it as well as a Brinell scale tester. I believe the other setting was "d" and we never used it as it was never specified. I only ever used the Rc scale and it does have 0.1 tenth decimals in the "c" range. It would be an awful knife for skinning if it was that soft. My Gerber pocket knife was Rc 54 so 44.8 would be better used as a throwing knife.
There are no hardness scales that I'm aware of where 44.8 is very hard. Brinell for instance which is used mostly for minerals 50 Rc would be about 490 Brinell. |
Tags |
bee, blade, book, cpm, fixed blade, folding knife, forge, gerber, heat, heat treat, knife, knives, making, pocket, pocket knife, scale, scales, shop, skinning, throw, throwing knife |
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