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Show posts MenuQuote from: wootz on April 19, 2019, 10:58:31 PM
Our "Knife Deburring" research discriminates burrs into "positive" that should be honed at a higher angle to get the edge sharper, and "negative" that should not.
In the context of knife sharpening, the term "negative burr" is an umbrella term, not fully matching the connotations given to it in the metallurgical science.
There is a branch in cognition science about human thinking based on polarized constructs. We've introduced this "positive-negative" construct to make selection of deburring method easy. This "positive-negative" logical construct helps us to choose the right honing method.
Van, if you cannot see your knife steel in the "Knife Deburring" book, the chapter SELECTION OF A DEBURRING METHOD, feel free to email me and I will advise the honing method to get the best sharpness and edge retention on your particular steel, as we keep records of all knife steels we sharpen.
You can detect the wire edge that forms when you hone the "positive burr" at the edge angle, even if you do not have a sharpness tester.
I'd say everyone who wants lasting sharpness should learn to detect the wire edge, because the wire edge gets crushed under the cutting load, rendering the edge dull; it is the main cause of your knives dulling early.
So, you have apexed your blade, and honed it on the Tormek leather wheel with the Tormek honing compound at the edge angle.
You cannot feel or see any burr, the edge cuts paper and shaves your forearm.
We know that, honed at the edge angle, the base of the "positive burr" will be shaped into the wire edge, while the "negative burr" knife steel will not. The base of the burr is called "burr root" in the specialist literature. The micro-hardness in the burr root is higher than in the base metal, allowing to hone it into a very sharp but unstable wire edge.
While it is not easy to detect wire edge in hard alloy high-end knives without special equipment, it is relatively simple in mainstream knives.
Even if you do not own a BESS sharpness tester, you can do a simplified test for wire edge by cross push-cutting a stretched fluorocarbon fishing line, and checking under good light or with a loupe if the very edge has got a micro-dent in the point of the cut – wire edge will dent, while the cleanly deburred apex will not.
Similarly, "positive burr" deburred at the edge angle will micro-dent, while the "negative burr" will not.
The fluorocarbon fishing line must be 7 LB 0.21 mm or near that.
Microscope image follows, but this dent can be seen with the naked-eye by scattered light.
On the wire edge the sharpness tester will show over 300 BESS, 500-600 BESS is not unusual, and 500 BESS is a dull knife.
I wrote the "Knife Deburring" book to explain types of the burr we get on knives and give all facts one may need to make his own informed conclusions and develop sharpening procedures that eliminate the wire edge, providing for lasting sharpness.
But if you don't feel like reading through the book, you can take my word for it, and simply follow our sharpening protocols. Our sharpening protocols by knife steel are detailed in the DEBURRING chapter of the book, but the basics are available for free in the evaluation version of the Knife Deburring book on our website, in its Sharpening Resources section.
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