Chips in the Blade

The General :

... 15N20 nickel rich steel was at that particular point ...
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That is easy to check, just pop the edge off the coin for the entire length and check for consistency. There would seem to be something wrong in any case as you can cut up coins with even really cheap steel knives without visible harm, Simonich even used to do it with Talonite blades. It is not like coins are made of hardened steel.

-Cliff
 
No, simply that the Talonite blades are softer than even really cheap steel blades. Even the henckels international line for example, and most similar cheap kitchen knives are 50-55 RC.

-Cliff
 
They are JUST still there but you have to be looking really really hard to see them.

My Sebenza is now very sharp however and I would not want to try it out on fleshy parts of my anatomy :D
 
The coin got into the back of the handle and because it was in contact with the edge as well as sticking out the top of the handle was exposed to pressure that put lateral and vertical stress on the edge for the best part of a full day. Not surprising it did some damage. The damage was at least a mm in depth slightly more, not tenths of mm.

After perhaps 50-60 passes with a sharpmaker the 'dink' is still easily visable with the naked eye, heck even non-knife knuts notice it. :o

I am sure if I had applied steady pressure I could have cut this coin into slices, with little damage, with steady pressire and made sure it was on the vertical plain.
 
The General :

The coin got into the back of the handle and because it was in contact with the edge as well as sticking out the top of the handle was exposed to pressure that put lateral and vertical stress on the edge for the best part of a full day. Not surprising it did some damage.
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It certainly would surprise me on a $350 knife. Hardened cutlery grade steel should be much stronger. Awhile back when the subject of brass rod testing was brought up, I spent a few hours using multiple knives on different rods, varying rod size and angle of knife to rod. What was common was the large amount of force necessary to get edges to significantly deflect.

A one mm dent is a about 0.020"+ thick [assumes a ~15 degree bevel]. That is a huge amount of steel to be pushed to the side. Consider that steel strengths are ~300 kpsi. You are looking at ~100 lbs to bend that much steel out of the way. You can impact the edge much easier than this, but it takes contact with a very hard object.

-Cliff
 
"$350 knife"

I WISH! It cost more than double that.

Hey its no big deal, my mistake and our British coins are super tempered boron gas reinforced Ti and then some!:p

$h1t happens and all that.

Damascus steel is fantastic, but not always the best.
 
Cliff, good point about 'significant force'. Short version: no good cutting area, first cut went ok , the second with no backing cut thru the tubing and bounced of the metal seat frame very soundly. I had flat spots, 1 small chip, and a half chip which rolled. All have been sharpened out and considering the WHAAP!! I feel lucky.
Sebenza, BG42.
guy.
 
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