As I understood it, Uwe was just saying that thickness of a knife is not just a function of distance along the edge, but of height above the edge as well, and he gave an example where the taper along the spine didn’t predict the taper closer to the edge. The content of what he was saying seems
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Distal taper
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Biomechanics, Free Full-Text
Grinding a distal taper down the blade towards the tip. I frequently check the thickness with my calipers to ensure I don't overgrind and ruin the taper.