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I had a similar experience recently.
I don't use production knives that I haven't reground to be thinner, but even still, going even thinner made a surprising difference. For example, my hap 40 endura is sitting at 7dps 0.013-0.015" thick, and compared to that my 6dps 0.005" power hacksaw blade knife goes through cardboard like it isn't even there.
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jimmy
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General
I'd want to see the repeatability data, preferably blinded. Taking good data is always way more difficult than it seems like it should be, but I'd think you'd be able to come up with something repeatable enough if you put some work into it.
The other big problem which applies equally to CATRA is coming up with a test medium that is a good proxy for what you really want to measu
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jimmy
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General
QuoteJason
Not to state the obvious, but wouldn't 52100 and AEB-L be some of the better steels to use for this? And maybe 1095 full hardness?
Better in what way? As a useable blade, or a test specimen?
1095 is cheap, I have a bunch, it's simple and doesn't require special protection from decarb when austenitizing, has less to gain from cryo (my dewar is empty at the moment)..
by
jimmy
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General
Well... controls are important. I'm getting the same deformation instead of chipping with conventionally HT 1095 at 65hrc. I guess I don't understand the failure mechanisms that well.
Using a screwdriver and a hammer coming in at an angle, I can reliably chip the edges. The carbide whacker still smooshes things though, even when at an angle.
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jimmy
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General
QuoteBTW, regards to the "flattening", I should have said denting: the edge was still kind of sharp, but bent to the sides and rippled into the secondary grind.
Ah, that makes more sense. When I said "flattening" I meant that it's not rolling because there's no force pushing to either side, and instead it's just plastically deforming straight in.
For examp
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jimmy
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General
I tested as low as 20 inclusive on this knife (about what is pictured) and as high as 32-35 inclusive. It didn't make any difference here as I couldn't get edge to chip no matter what, but generally lower angles will promote warping and rolling over chipping because a given amount of elongation before failure will result in an edge that is more obviously out of whack.
Cliff got Alvin
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jimmy
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General
There's a trade off between strength and toughness, and therefore between rolling/flattening and chipping failures. In general, the way to maximize performance is to split the difference because the problems from the larger evil will grow faster than the problems from the smaller evil will shrink. If a blade never chips, added toughness has nothing to improve yet added strength will reduce r
by
jimmy
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General