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TOPIC: Thought on Hand Stropping with cheap compounds?

Re: Thought on Hand Stropping with cheap compounds? 2 years 3 months ago #2444

  • KenSchwartz
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This is a difficult topic as no one has found a definition of sharpness that covers all cases and that satisfies all their needs for evaluation. In short, it is a tower of Babel.

Take the CATRA testing. It is essentially evaluating push cutting performance under strict guidelines. It is setup to detect the instant that a cut starts. Essentially a burst injury type of separation. It tells you very little of slice cutting performance. It also tells you little of how a blade's overall geometry contributes or inhibits the ability of a knife to pass through an object or objects of different density. So, for instance, if you cut a cucumber slowly it may not cleanly separate, but with a bit more speed the inertia will 'follow through' and you get better separation. This is different than a straight push cut vs a slight slicing motion when contacting the board. People have used string extended over a platform on a scale, and taring the platform's weight measured the point where the string is cut. This is fraught with string consistency issues, string tension issues, matching the string performance to the force range of the cut and variance along the edge, etc.

In a practical but imperfect sense, I use the ability of a knife to slice or push cut through copy paper as one index. For push cuts it is a direct downward motion perpendicular and from a point of touching the paper. I measure how far out from a pinch grip it will do this, eg push cutting 2 inches from a pinch grip. There are ways to cheat on this and edge thickness and angles change the values for equally sharpened edges. Ultimately the ideal test of sharpness is done by using the knife for it's intended task.

Not all knives are sharpened the same along their whole length, so ultimately you have to sample along the whole length. So for instance, a deba might have a less acute angle at it's heel than it's tip because the heel is used for chopping off fish heads and the tip and midsection for filleting the fish so the angle is varied along it's length in a continuously variable fashion. This CAN be done with a WE.

Sharpness is not the only goal involved in sharpening a knife. You trade for longevity of the edge, the task it will be used for and so forth. In some instances aesthetic considerations may even exceed sharpness requirements. This is a topic in itself, which can take into account both personal and cultural aesthetics. In some instances like shaving, comfort may be of equal importance to sharpness.

This doesn't even begin a discussion of defining sharpness.

---
Ken

BassLakeDan wrote:
Quote from Ken "... I thought I knew what sharp was, but I have proven myself wrong so many times that now I just look forward to reaching the next level."

Ken, Your statement above caught my eye.. how have you established that one blade is sharper than another? has anyone been able to get there hands on and loan us one of these ? Actually have one on order myself, it is due to be delivered just after I win the next Mega-Lotto

www.catra.org/pages/products/kniveslevel1/surgredst.htm B)
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Re: Thought on Hand Stropping with cheap compounds? 2 years 3 months ago #2446

  • leomitch
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For me there is also great satsifaction just knowing my knife is so crazy sharp and I made it that way...there is a kind of male pride knowing this. I suppose it may have something to do with a sense of manliness that harkens back to the days when a sharp knife was an indispensible tool necessary for life.This may flow from my limbic brain!! LOL!
Well done Ken! I really enjoyed your commentary, most pertinent!

Best regards
Leo
Never go anywhere without your knife!
Gibbs rule number 9

Leo James Mitchell
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Re: Thought on Hand Stropping with cheap compounds? 2 years 3 months ago #2447

  • BassLakeDan
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leomitch wrote:
For me there is also great satsifaction just knowing my knife is so crazy sharp and I made it that way...there is a kind of male pride knowing this. I suppose it may have something to do with a sense of manliness that harkens back to the days when a sharp knife was an indispensible tool necessary for life.This may flow from my limbic brain!! LOL!
Well done Ken! I really enjoyed your commentary, most pertinent!

Best regards
Leo

Yes i agree Leo that Kens Quote above is a classic and very well stated.. I am going to print it out for future reference. Actually I think it is so well done that it needs to be in some sort of Reference Archive here on the board!

As for your man-cave perspective well :woohoo: don't look over your shoulder, as something might be gaining on you, and her knife might be sharper than yours !!!!
Last Edit: 2 years 3 months ago by BassLakeDan.
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Re: Thought on Hand Stropping with cheap compounds? 2 years 3 months ago #2449

  • leomitch
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Yes I agree that knowledge like this should be kept somehow on this forum in a safe reference area...I shall speak to Clay about that and see if it can be done.
As for her gaining on me, let her come! My knife is bound to be sharper than her knife, but maybe not as sharp as her tongue!! Whoops! I will pay for that I have a feeling! LOL!

Leo
Never go anywhere without your knife!
Gibbs rule number 9

Leo James Mitchell
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Re: Thought on Hand Stropping with cheap compounds? 2 years 3 months ago #2562

  • jendeindustries
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+1 on everything Ken said!!!

And we haven't even touched the subject of aesthetic polishing vs. establishing "true" grit edges! :evil:
Tom Blodgett
Jende Industries, LLC

My Blog: jendeindustries.wordpress.com
Last Edit: 2 years 3 months ago by jendeindustries.
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