Potential problem?

H

Hesparus

Joined
Oct 31, 2004
Messages
1,442
A friend of mine just asked me to make him a sankuto with an 8.5" blade. I was planning on using 3/32" 440c but I am worried about the possibility of it warping during heat treating. I understand that if I heat treat it before grinding the edge this may help but I do not look forward to grinding all of that on a hardened piece of steel.
Also, he would prefer the knife to be ground with a single bevel although a double bevel would do. Am I correct in my understanding that a blade ground with a single bevel before heat treating would most certainly warp horribly?
What do you think?

- Chris
 
Do it, and if it warps, tell him that's how REAL santokus look! :D
Seriously, though, there must be a way to do this sort of thing without doing all the grinding after heat treat. What do the production companies who use chisel grinds on everything do? Is there some sort of fixture that can prevent the blade from warping while it's in the oven?
 
Go ahead and grind it, check it for straightness before sending it to a reputable heat treater and don't worry.

I found that my "warpage" problems disappeared when I began to check all of my blades for straightness before heat treating, can't quite figure out why.
 
A good heat treater rarely warps a stainless blade.Grind it as a convex grind (apple seed grind to the Japanese),which on a 3/32 blade is basically a flat grind.Leave about 1/32 on the edge to do after HT.Sand it to a good 400 grit hand finish before HT,those deep scratches are a B****H to get out of stainless after HT.
Stacy
 
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