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The difficulty of cuts is a combination of the target material hardness, the direction of the grain of the target (if any), the quality of the sword, the angle of the blade (刃筋; hasuji) on impact, and the angle of the swing of the sword (太刀筋; tachisuji).
A sword is an edged, ... Also, an acute edge angle is not the primary factor of a blade's sharpness. ... German Medieval Armies 1000-1300. Osprey Publishing.
Sharpness refers to the ability of a blade, point, or cutting implement to cut through materials with minimal force, and can more specifically be defined as the capacity of a surface to initiate the cut. [1] Sharpness depends on factors such as the edge angle, edge width, and the fineness of the cutting edge, and is aided by material hardness.
It causes the blade to curve and 2.) It produces a visible boundary between the hard and soft steel. When quenched, the uninsulated edge contracts, causing the sword to first bend towards the edge. However, the edge cannot contract fully before the martensite forms, because the rest of the sword remains hot and in a thermally expanded state.
This process is long and tedious, but a good polisher was of great value to the swordsmith and was often paid well. After the sword was polished, the fine tip could be sharpened. The sharpness of a sword, and ability to keep that edge, is based on the angle of the edge and the width of the body of the sword.
A blade's sharpness may be tested by checking if it "bites"—begins to cut by being drawn across an object without pressure. Specialized sticks exist to check bite, though one can also use a soft ballpoint pen, such as the common white Bic Stic. A thumbnail may be used [6] at the risk of a cut, or the edge of a sheet of paper. For kitchen ...
Wazamono (Japanese: 業 （ わざ ） 物 （ もの ）) is a Japanese term that, in a literal sense, refers to an instrument that plays as it should; in the context of Japanese swords and sword collecting, wazamono denotes any sword with a sharp edge that has been tested to cut well, usually by professional sword appraisers via the art of tameshigiri (test cutting).
Tsujigiri (辻斬り or 辻斬, literally "crossroads killing") is a Japanese term for a practice when a samurai, after receiving a new katana or developing a new fighting style or weapon, tests its effectiveness by attacking a human opponent, usually a random defenseless passer-by, in many cases during night time. [1]