Just wondering whats the hardest knife?

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Dagon said:
> Where'd you pick that up?

Here.
It is a truly fantastic gentleman knife. Not cheap, but it offers quality, if you can live with the constraints of a ceramic blade (which I think are pretty ok for a gentlemen knife).
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It seems like a ceramic blade would be very sharp, so it would be fine to cut most things with (very little pressure would be needed), and it would hold that edge for a long time, no?
 
Brutus013 said:
It seems like a ceramic blade would be very sharp, so it would be fine to cut most things with (very little pressure would be needed), and it would hold that edge for a long time, no?
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Hold an edge? absolutely yes.
Cut with little pressure? No less pressure than with a steel blade.
 
knarfeng said:
Hold an edge? absolutely yes.
Cut with little pressure? No less pressure than with a steel blade.
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I realize that, I just meant that the ceramic is probably sharp enough to where the brittleness shouldn't be a problem when cutting most materials.
 
That has not been the reported outcome of using an EDC with a ceramic blade. Not at least in any threads I have read.
 
Well, until now the brittleness was no issue with my kyocera pocket knife. Now this uses their relatively recent high-end ceramic blade material, perhaps it's stronger. I have mainly used it on paper and cardboard, taking care to do only pure slicing movements (no prying, and being careful with the tip).
The pressure needed is not less than my Fallkniven U2 (which also seems to hold it's edge very well), and the edge retention is exceptional.
Here is a sales blurb with test graphic on the edge retention of the new HIP material. And this page shows the full range of the Kyocera pocket knives.
 
That sounds about right. Making a straight slice, especially through paper or cardboard, is what I'd expect the ceramic blade to excel at doing. And it should require about the same pressure as steel. The brittleness would only be a limitation when cutting such that there is a horizontal force sideways on the blade.

It's a pretty thing, that's for sure.
 
mete said:
It's ceramic not steel so the hardness would be measured by some other system than Rockwell.
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I was arguing with my shop teacher the other day, they were cutting glass in my class via scoring and he mentioned that glass is hard, I continued in saying that it was around mohs of 7. He looked at me like I had two heads and said "rockwell!", I asked him if he has ever tried to centre punch glass but didn't get a response.
 
> Whats the long of the blade on those poket knifes? It says 40 and 50. Blade or OL?

These pocket knifes exist in 40mm and 50mm blades, and the ones with "simpler" (cheaper) ceramic have a different handle inlay. The blade of mine is 50mm. Thus it is pretty small.
Perhaps you have seen my thread "Guess what the two favorite knives in my core collection are?" - I relink the picture here so you can compare the size of the Kyocera to a number of other ones:

33nyr60.jpg
 
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Dagon said:
> Whats the long of the blade on those poket knifes? It says 40 and 50. Blade or OL?

These pocket knifes exist in 40mm and 50mm blades, and the ones with "simpler" (cheaper) ceramic have a different handle inlay. The blade of mine is 50mm. Thus it is pretty small.
Perhaps you have seen my thread "Guess what the two favorite knives in my core collection are?" - I relink the picture here so you can compare the size of the Kyocera to a number of other ones:

33nyr60.jpg
Click to expand...

Thaks for that info. Nice colection. How sharp can you get the kyocera? will it split hair?

Cheers
Frank
 
> How sharp can you get the kyocera?

It's not something you can sharpen yourself, it has to be sent back to kyocera for that. But that's acceptable since it holds its edge very, very well.

> will it split hair?
I haven't checked yet. It does dry shaving.
 
Dagon said:
> How sharp can you get the kyocera?

It's not something you can sharpen yourself, it has to be sent back to kyocera for that. But that's acceptable since it holds its edge very, very well.

Not even diamond?

> will it split hair?
I haven't checked yet. It does dry shaving.
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Good enogh for me. Thanks agin.

Cheers
Frank
 
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