Straightedge

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straightedge

[′strād‚ej]
(design engineering)
A strip of wood, plastic, or metal with one or more long edges made straight with a desired degree of accuracy.

Straightedge

 

in machine building, a rule for testing the flatness and parallelism of a surface. Straightedges measure the maximum distance between points on the surface’s profile and a contiguous straight line—the edge of the rule.

Two types of straightedges are distinguished: toolmakers’ straightedges (master straightedges) and straightedges with a broad working surface. The master straightedges may have two edges, three faces, or four faces. Other straightedges have a broad working surface with a right angular or bow shape or I-beam cross section. Master straightedges are used to test the flatness and parallelism of a surface by means of the gap between the surface and the edge of the straightedge applied to it. It is thus possible to detect gaps of 1–5 microns (μ). Straightedges with broad working surfaces determine flatness and parallelism by measuring linear deviations of the surface being inspected in comparison with the surface of the straightedge, which is held on supports. Checking for flatness may also be done by painting the surface to be inspected and moving the straightedge across it; the paint will then be scraped off the raised portions of the surface. Angled straightedges are used only with this method.

Master straightedges are made in various lengths from 80 to 500 mm. Straightedges with broad working surfaces have lengths of 200 to 4,000 mm, and angled straightedges have lengths of 630 to 1,000 mm, with angles of 45°, 55°, and 60°. The working surfaces of master straightedges deviate from linearity by 0.6 to 4 μ, depending on the length and the degree of accuracy. The variation of flatness in straightedges with broad working surfaces depart from flatness by 2.5 to 100 μ.

N. N. MARKOV

straightedge, rod

1. A rigid, straight piece of wood or metal used to strike off a concrete, mortared, or plastered surface; a screed, 2.
2. A long piece of seasoned, planed wood having straight, parallel edges; used in construction to lay out straight lines and to align framing.
References in periodicals archive ?
Critics agreed that Henderson's writing style and her characterization are her strongest skills, and they enjoyed her look at straight-edge punk.
Straight-edge cuts are made by knives wielded by human hands.
What's it like being a straight-edge band from Amsterdam?
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This study emphasized in-depth interviews with youths in the Philadelphia area straight-edge scene, combined with direct observation at shows and supplementary content analysis of documents, including fanzines and some Internet sites.
Because our primary interest was with the presentation of straight edge on the Internet at straight-edge sites, our first task was to determine very roughly the size of the population of sites.
Our primary research approach was qualitative content analysis of straight-edge documents found on the Internet.
If you have a very bowed board, snap a straight line with your chalk box, then use your circular saw to get a rough straight-edge before routing.--S.S.]
Dirty Dawes is handling photo duties on this one, and it is rumored he and Freddy are taking it straight-edge (read: slamming O'Douls) to maximize the production.
Straight-edge became for some a religion even more brain-numbing and dogmatic than most others.
The author of Evasion (it was a 'zine, but has since been expanded and published by an anarchist press) is a straight-edge, vegan, dumpster-diving hobo.