What makes a Sharp tool Sharp? The most important things to understand about sharpening tools. Sharpness is Convergence, Bevel angles, and Blade polish.
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It’s helpful to have a theoretical understanding of sharpening. If we understand something of what sharpness is, we can better perform it, troubleshoot it and teach it to other people. Sharpening theory is simple, but important. Whether sharpening knives, chisels, axes, plane bits etc, the theory and technique are relatively the same. Sharpness is two sides coming together to converge into an edge, The angle formed at the edge when they come together and how finely polished the bevels are.
I think sharpness is defined by how easily a tool will cut, as long as it is cutting something that will not severely damage the edge. Many may think of sharpness as how well ground the tool is, but I think angle has to be considered as an important factor in sharpness. A tool sharpened at 55 degrees and a tool sharpened at 15 degrees, both polished the same will not be equally sharp. Run across your skin with the same pressure, one will cut deeper every time.
The fineness of grind is the second critical factor. Sharpening steel tools is a process of abrasion. The fineness of the grit on the sharpening stone determines how small or large the scratches on the blade are, which in turn dictates how sharp the tool is (for a given bevel angle) since the scratches go all the way to the edge of the blade. Large scratches equal a coarse edge and vice versa.
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