![]() ![]() ![]() Once the spine has lost a little steel, then the back edge of the spine bevel is indeed the thickest point of the spine, and your analysis would be correct in the end, if not the means. For that to be correct the bevel angle would have to be zero. So it is from the assumption of your first sentence that the reasoning is not precisely correct. It is offset by half the bevel angle toward the edge, relative to the center of the spine. Initial contact between hone and spine is not at 90 degrees to the axis of the blade. This is because the honing plane is not parallel to the central plane of the blade. But initially, when the bevel on the spine is still an extremely narrow line, the thickest measurement of the spine can be above the spine's bevel. This is certainly true after a certain amount of honing wear to the spine.
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