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than a smooth blade or other edge, the applied pressure at each point of contact is greater, and the points of contact are at a sharper angle to the material being cut. This causes a cutting action that involves many small splits in the surface of the material being cut, which cumulatively serve to
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to cut cloth with a serrated edge, which, somewhat counterintuitively, reduces fraying by reducing the average length of a thread that may be pulled from the edge. A type of serration is also found in airframe shapes used in certain
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petal, is described as being serrated. A serrated leaf edge may reduce the force of wind and other natural elements. Probably the largest serrations on Earth occur on the skylines of mountains (the
Spanish word
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83:-like appearance or a row of sharp or tooth-like projections. A serrated cutting edge has many small points of contact with the material being cut. By having less
112:, as in the Sierra Nevada, means a saw). These occur due to the uneven action of landform edges pushing rock upwards, and the uneven action of
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show serration in profile, although they are usually shown in abbreviated or symbolic fashion on mechanical drawings to save time and ink.
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and step block assembly in metalworking adopt serration for the purpose of applying clamping pressure from an adjustable position.
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Human uses of serration have copied, and gone beyond, those found in nature. For example, the teeth on a
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are made with serrated edges on the leather pieces, for no known purpose at all other than style. The
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serve a similar cutting or scraping purpose as the serration of an animal tooth. Tailors use
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In nature, serration is commonly seen in the cutting edge on the
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Saw-like appearance; a row of sharp projections on an edge
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88:cut the material along the line of the blade.
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103:or other plant part, such as the edge of a
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95:of some species, usually
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