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Sunday SOTD Thread - October 13th, 2024 (#490)
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this post was submitted on 13 Oct 2024
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How are you guys measuring the bevel? Can you just lay it flat, set your phone on top and use one of those measurement apps?
I measure the sharpening angle, then double it to get the bevel angle. The sharpening angle is defined by the centerline from the spine through the apex and the line from the spine's widest point to the apex;
I just measure the spine width (a) with a caliper, divide that by 2 (a'), then measure the distance between the apex and the widest point on the spine (b) with a machinist's rule (where it would rest on a sharpening stone). then:
bevel angle = 2 * arcsine(a'/b)
or
bevel angle = 2 * arcsine(a/(2b)) [sometimes this is easier if I'm doing the math in my head]
That makes sense. Likely more accurate than a phone sensor.