Visual aid scratches

€ 471.00 *Prices are exclusive of VAT

Article code: RUB/019

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Specimen made for the General Electric Aircraft Engine Corporation. The Visual Aid Scratches consists of twelve patches of steel surfaces, which have been machined by four different processes (three specimens of different roughness values for each of grinding, turning, horizontal milling, and end milling). In addition, each individual patch bears two sets of scratches of 3 different depths, one set parallel and the other perpendicular to, the lay of the machining marks of the specimen.
This visual aid is used in a GE jet engine assembly plant to address a quality control issue that frequently arose during unpacking of engine parts delivered to the plant by subcontractors. If any part is accidentally damaged, by a box-cutting knife for example, then someone has to decide whether the resulting scratch or nick on the particular surface in question is negligible, or fatal, or just serious enough to need accurate inspection. The visual aids provide samples which help the inspectors estimate the depth or scale of the damage.

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