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Old 03-15-2012, 11:16 PM
BItPlz BItPlz is offline
Join Date: Feb 2012
Location: Lincoln/Omaha Ne
Posts: 6
Pre HT Thickness

I am working to try a "flat grind" on one of my first blades, I have set up a make shift grinding station based on a Lansky Sharpening set that I have.
I am starting with 3/16" steel and I have read that you do not want to put an edge on the blade before HT as it could warp during quenching
My question is what thickness do I want to grind the blade edge down to before I attempt to Heat Treat it.
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Old 03-16-2012, 04:33 AM
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Robert Mayo Robert Mayo is offline
Join Date: Nov 2005
Location: Renfrew Ont. in the heart of the Ottawa Valley
Posts: 676
I usualy leave the edge about the thickness of a dime to allow for decarb and finishing up after heat treating my carbon steel blades.

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Old 03-16-2012, 07:29 AM
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Crex Crex is offline
Join Date: Sep 2002
Location: Acworth, GA and/or Hanging Dog, NC
Posts: 3,591
Putting an edge on your blade prior to HT won't be the cause of warpage. Warpage will occur due to unbalanced stresses in the steel and other factors such as uneven temps in quenchant, uneven heating, uneven.......key word. Get things even, remove all sharp angles "inner" and "outer" (these produce stress points during quench), and run a few normalizing cycles prior to quench (I prefer at least three), make sure your quenchant is at proper temp for your steel and you will greatly reduce the risk of warpage and stress cracks.
As Bob said the issue with preshaping/presharpening the edge too thin is primarily decarb.

Carl Rechsteiner, Bladesmith
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Old 03-21-2012, 04:48 PM
Doug Lester Doug Lester is offline
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Location: Decatur, IL
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I have had good luck with heat treating, rather re-heat treating, blades after I have put an edge on them. You do want to keep the austinization temperature down to just a bit above critical temperature to help prevent warping but that's really an overheating problem. Another reason to keep the edge just a tad thick is just safety. You might find out the hard way that sharp things cut. If you do have to work with a blade that has a sharp edge I would recommend that you tape it over. Blue painter's tape works well and it's easier to get off than regular masking tape.


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blade, edge, grinding, heat treat, knife, sharpening, steel

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