Archaeologists have also discovered rasps made of iron used by the Assyrians, dating back to the 7th Century BC.ĭuring the Middle Ages files were already quite advanced, thanks to the extensive talents of blacksmiths. Archaeologists have discovered rasps made from bronze in Egypt, dating back to the years 1200–1000 BC. The Bronze Age and the Iron Age had various kinds of files and rasps. The Disston authors state, "To abrade, or file, ancient man used sand, grit, coral, bone, fish skin, and gritty woods,-also stone of varying hardness in connection with sand and water." Relatedly, lapping is also quite ancient, with wood and beach sand offering a natural pair of lap and lapping compound.
įiles have also been developed with abrasive surfaces, such as natural or synthetic diamond grains or silicon carbide, allowing removal of material that would dull or resist steel files, such as ceramic.Įarly filing or rasping has prehistoric roots and grew naturally out of the blending of the twin inspirations of cutting with stone cutting tools (such as hand axes) and abrading using natural abrasives, such as well-suited types of stone (for example, sandstone). Ī rasp is a form of file with distinct, individually cut teeth used for coarsely removing large amounts of material. A narrow, pointed tang is common at one end, to which a handle may be fitted. Most are hand tools, made of a case hardened steel bar of rectangular, square, triangular, or round cross-section, with one or more surfaces cut with sharp, generally parallel teeth. It is common in woodworking, metalworking, and other similar trade and hobby tasks.
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