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Typical edge angles are about 20° (making the included angle 40° on a double-ground edge). [2] The edge angle for very sharp knives can be as little as 10 degrees (for a 20° included angle). Knives that require a tough edge (such as those that chop) may sharpen at 25° or more.
Very sharp knives sharpen at about 10 d.p.s (degrees per side) (which implies that the knife's edge has an included angle of 20-degrees). Generally speaking, razors, paring knives, and fillet knives should be the sharpest knives at an angle of 12° – 18°.
The block has two magnetic sides, one angled at 15 degrees and the other at 20 degrees. The smaller the degree of the angle, the sharper it makes the blade.
Sharpness depends on factors such as the edge angle, edge width, and the fineness of the cutting edge, and is aided by material hardness. This quality is found in a variety of naturally occurring forms, including certain kinds of rock , in plant thorns and spines, and in animal teeth, claws, horns, and other structures serving various purposes.
As many Japanese culinary knives tend to be chisel-ground, they are often sharper than a typical double-bevelled Western culinary knife; a chisel grind has only a single edge angle; if a sabre-ground blade has the same edge angle as a chisel grind, it still has angles on both sides of the blade centreline, and so has twice the included angle ...
The term is based on the word "whet", which means to sharpen a blade, [2] [3] not on the word "wet". The verb nowadays to describe the process of using a sharpening stone for a knife is simply to sharpen, but the older term to whet is still sometimes used, though so rare in this sense that it is no longer mentioned in, for example, the Oxford Living Dictionaries.
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