Sharpnes record - 40g

nozh2002

nozh2002

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Jun 9, 2003
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Just, recently I try new instrument for sharpening and got amazing result.
I sharpen my old Model T Street (2005) to the sharpness 40 gramm to cut cotton thread.

I fix thread on the weights and measure pressure required to cut thread. I do 21 measurements and get median as a result.

I got 40 gram sharpness (and median was close to 30). This is full results:

20 +++
30 +++++
40 ++X++++++
50 +++
60
70 +

And 3 times it was 20 g - like lightest touch and it was cut! Never saw this before!

Usually average sharpness for manufactured knives 90-100 (Best 60, worst 130). Before I was able to sharpen to 70 myself. But now I think I get how to make it!

I played with it trying to cut hair, keeping blade fixed and moving my Slavic hair over the edge. Not consistently but few times (10% cases) it was able to cut/ But now I have it split! It looks like tiny branch about 3mm long. Do not know how this happen.

This is first time I split the hair:

hair-01.jpg


hair-02.jpg


Then I tried to repeat it and and I did! It almost cut off but you may see that it actually split there.

hair-03.jpg


hair-04.jpg


hair-05.jpg


hair-07.jpg


Never thought this possible. I was able before to slice surface of newspaper and cut off skin on finger tips without blood, but not hair.

I use DMT benchstones, green rouge and diamond powder on leather up to 100000 Mesh.

Thanks, Vassili.
 
I saw a guy at a knife show fillet a single hair three times around the shaft and the fillets were also still attached, I saw him sharpen five other knives and get the same result each time.

He used a paper wheel and buffer to do this,when I looked at my buddies knife the guy sharpened for him it looked like it had a slight convex curve on the final bevel.

I sharpen 99% freehand and 1% on an Edge-Pro APEX.

BTW show more pics of the knife edge not the hair, 1 picture maybe 2 of the hair but show everyone what a close up of a knife edge that can fillet hair looks like so they can compare to their's.

I've always said learn what a sharp knife looks like and you'll be able to reference your knife against it.

Any one who sharpens should at least have a 10X magnifier so you can see the edge.
 
I think I use thin leather and not glue it to brick but instead screw it on the sides:

sharpening-07.jpg


So in result I have less chanses to round the edge, because leather does not tents to bend under edge. It is some space between leather and wood so it more flexible and rather stretch then bend (??rumple??) - picture is different then with thick leather glued to wood.

I also move it with slightest possible pressure.

I think this is major changes.

I also substitute 6 microns Diamond powder to Green Rouge as cheaper solution to make edge mirror polished. And use up to 100000 Mesh diamond powder (First after Green Rouge 14000, then 50000 and then 100000).

Thanks, Vassili.

P.S. To see difference I guess you need more then 400 magnification better 1000 and I do not have this kind of equipment (I have only up to 400). So results of testing is what only really available.
 
i have been amazing people for years by splitting hairs. the wheels are the way to go if you want consistent results each time in a couple of minutes. try touching an attached hair to see if it pops off. if it does, then its pretty darned sharp. i have 3 short video's showing how to use the wheels if anyone is interested. nozh, how long did it take you to get your knife that sharp?
 
Dang, that's one sharp knife Vassili. Good work :thumbup:

I have a strop coming in the mail soon. Hope that helps sharpen up my knives like it has with yours.
 
FYI-
My edges have been splitting hairs since I was about 12 years old. :p
But there's another step further- hair splitting still leaves some room for improvment. You can get it even sharper so that it's very difficult to split hairs. Instead it will just cut them right off. You can also check this kinda like guys do with newsprint- the further away from your fingers you can still cut the paper (or hair), the sharper the knife. It's been a while since I really concentrated on getting things that sharp, but I remember I could cleanly cut a hair off, over an inch away from where my fingers were supporting/holding it.
 
the possum said:
FYI-
My edges have been splitting hairs since I was about 12 years old. :p
But there's another step further- hair splitting still leaves some room for improvment. You can get it even sharper so that it's very difficult to split hairs. Instead it will just cut them right off. You can also check this kinda like guys do with newsprint- the further away from your fingers you can still cut the paper (or hair), the sharper the knife. It's been a while since I really concentrated on getting things that sharp, but I remember I could cleanly cut a hair off, over an inch away from where my fingers were supporting/holding it.
Click to expand...

It cut hair also depends on how fast you move the blade, in this case, not fast, not slow -with average moution it cuts easy and clean. I think splitting is harder.

Thanks, Vassili.
 
richard j said:
i have been amazing people for years by splitting hairs. the wheels are the way to go if you want consistent results each time in a couple of minutes. try touching an attached hair to see if it pops off. if it does, then its pretty darned sharp. i have 3 short video's showing how to use the wheels if anyone is interested. nozh, how long did it take you to get your knife that sharp?
Click to expand...

It takes 30 minutes. But for me it is like meditation...

Thanks, Vassili.
 
Great pics and results! Your new techniques definately work well! That is the type of hair whittling I do when I polish an edge to see if I did it right. I steal my wife's hair from her brush and when I can get tiny curls to peel off and stay attached I know I did a good job (when you get a few curls whittled the hair looks like a cornstalk, as my freind Thom Brogan has said). My photography skills suck, though, so I can't get a clear picture like you did of the hairs. That is awesome work there, on both the sharpening and pictures.

Mike
 
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