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Sharpening these implements can be expressed as the creation of two intersecting planes which produce an edge that is sharp enough to cut through the target material. For example, the blade of a steel knife is ground to a bevel so that the two sides of the blade meet. This edge is then refined by honing until the blade is capable of cutting.
Sharpened metal drop-point blade Naturally occurring sharp obsidian piece Shark tooth with a sharp, serrated edge A sewing needle comes to a sharp point. 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]
Circular saw blades are jointed prior to sharpening so that all teeth protrude from the blade the same distance from the centre. Jointer knives are ground until they are all the same length prior to sharpening. The edges of a card scraper are jointed by running the edge over a file or a sharpening stone prior to using a burnisher to turn the burr.
Roughly sharpening a blunt edge 1000-2000: 8 μm: Fine, will leave a blade sharper than most factory edges 4,000: 4 μm: Ultra-fine, for cutting meat 8,000: 2 μm: Further smoothing a sharp edge for cutting fish or vegetables (sinews in meat will bend an edge this sharp) 10,000: 0.5 μm: Polishing an edge to a mirror-smooth (but possibly ...
A sharp blade will have a distinct edge, like a corner, and may sing slightly from vibration, while a dull blade will have a round edge and the thumb will slip over it. A blade's sharpness may be tested by checking if it "bites"—begins to cut by being drawn across an object without pressure .
During normal use, cutting edges either wear and/or chip. The geometric features of cutting tools can be automatically measured within the CNC tool grinder and the tool ground to return cutting surfaces to optimal condition. Significant software advancements have allowed CNC tool and cutter grinders to be utilized in a wide range of industries.
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