How To Ground too thin before HT

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Dec 8, 2017
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So there I was, just grinding away, happily trying to get clean grind lines on a bowie that I’m making from a farrier’s rasp, when I noticed that I had taken the blade down to pretty much a sharp(ish) edge.

Mistakes happen. New grinder and it’s only about the 5th knife I’ve ever made.

I’ve been told to leave things about as thick as a penny before HT to avoid warping and have always followed that advice (until now).

What am I looking at here? Is there a way to mitigate the risk of warp?

Keep in mind, I’m a novice doing a home HT on found steel with a propane forge and canola oil. So... All the normal risks of using half-ass methods on mystery steel will still apply. I’m just wondering if, under any circumstances there is a preferred method for dealing with the overzealous grinder.
 
How thin is it?
0.5mm is a good thickness.
If you want it thicker just go over the edge with a fine file.
 
It’s about .2 mm at the edge. I’m bad at math but I think I’d have to take off about 2 - 3 mm to get to .5mm (plus or minus the “calipers dropped on the floor a few times” margin of error).
 
I use knives with a 0.2mm edge but they are stainless.
Consider it a learning project and just see what happens
 
Grind the edge back....you're going to loose a little blade width, but you will save all the work you've done.
 
i also agree with grinding it back. the bacon edge might pull some of the metal that is thick enough into a warp also, and you will lose more metal.
 
Agreed, just grind it back to about .75mm to 1mm.

The thickness of a penny is way to thick. about half a penny is right. You read all those "thickness of a dime/penny/nickel" things online, but those ate in the .5 to .9" range. Ypu want the edge around .03-.04" or .75-1mm when doing HT.
 
Thanks for the feedback.

I guess I’ll have to grind some of the edge off & tweak the profile a little. :confused:

The good news is, unlike my real job, when I screw up here nobody goes to jail!o_O
 
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