08-28-2019, 03:43 PM
(This post was last modified: 08-28-2019, 04:44 PM by KnifeGrinders.)
We are talking about cutting the BESS test line of 0.2 mm in diameter, and since during the test we actually have a combination of cut (initial nick) and tear, we actually are talking about cutting into the first 0.05 - 0.1 mm of the test line.
Thinking of an explanation for "Why the 40° edge will not score as well as the 20°" when the apex width is the same, I conclude that there is more than the apex width that gives the score we see.
You've seen a Big Brown Bear YouTube video that shows a knife scoring 4 BESS - that's how score his knives he intentionally sharpens at an edge angle lower than the straight cutthroat razors.
Well sharpened and properly deburred straight razors of 7-8 dps score in the vicinity of 20 BESS;
Quality knife steel properly sharpened at 10 dps scores 30-50 BESS;
The same knife steel at 15 dps scores 70-90 BESS;
and at 20 dps over 100 BESS.
Looking at this regression in the BESS score, at this drop in edge sharpness with the increase in edge angle, we inevitably think that the BESS score depends on more than only the edge apex width/diameter. The score comes from both the apex width and the edge width behind the apex, and the latter comes from the edge angle.
Practically, in actual sharpening challenges, it is futile to expect a 20 dps edge score under 100 BESS, and a 15 dps score under 50 BESS, even when in the hanging hair test both split it.
Thinking of an explanation for "Why the 40° edge will not score as well as the 20°" when the apex width is the same, I conclude that there is more than the apex width that gives the score we see.
You've seen a Big Brown Bear YouTube video that shows a knife scoring 4 BESS - that's how score his knives he intentionally sharpens at an edge angle lower than the straight cutthroat razors.
Well sharpened and properly deburred straight razors of 7-8 dps score in the vicinity of 20 BESS;
Quality knife steel properly sharpened at 10 dps scores 30-50 BESS;
The same knife steel at 15 dps scores 70-90 BESS;
and at 20 dps over 100 BESS.
Looking at this regression in the BESS score, at this drop in edge sharpness with the increase in edge angle, we inevitably think that the BESS score depends on more than only the edge apex width/diameter. The score comes from both the apex width and the edge width behind the apex, and the latter comes from the edge angle.
Practically, in actual sharpening challenges, it is futile to expect a 20 dps edge score under 100 BESS, and a 15 dps score under 50 BESS, even when in the hanging hair test both split it.
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