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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.
A cutting mat is a mat that is placed between a workpiece to be cut and the surface below (e.g. a table) to protect the surface. They are used, amongst other things, in hobby work for precise and clean cuts of paper, cardboard or textiles using a scalpel or rotary cutter .
Machii also has most cuts to 1 mat (Suegiri) with a total of 8 times on 23 April 2015. [13] The record for most martial arts sword cuts in one minute (73) is held by Agisilaos Vesexidis of Greece on 25 June 2016. [14] Toshishiro Obata holds the record for Kabuto Wari (兜割), or helmet cutting, for his cut on a steel Kabuto (兜; helmet). [15]
In machining, the rake angle is a parameter used in various cutting processes, describing the angle of the cutting face relative to the workpiece. There are three types of rake angles: positive, zero or neutral, and negative. Positive rake: A tool has a positive rake when the face of the cutting tool slopes away from the cutting edge at inner side.
4Cr14MoV, EN 1.4117 / DIN X38CrMoV15, good enough to make kitchen knives. 5Cr15MoV, some knives manufacturers define as 5Cr13MoV, the hardness could be 55–57 HRC. It's widely used to make kitchen knives, high-end scissors, folding knives, hunting knives, etc. It is equivalent to 1.4116 and German 4116 steel in composition.
A good knife needs a good knife sharpener to keep said good knife sharp. Ina favors the Chef'sChoice brand. This compact model sharpens both straight-edge and serrated 20-degree class knives.