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Lost-foam casting (LFC) is a type of evaporative-pattern casting process that is similar to investment casting except foam is used for the pattern instead of wax. This process takes advantage of the low boiling point of polymer foams to simplify the investment casting process by removing the need to melt the wax out of the mold.
Berlin wool work is a style of embroidery similar to today's needlepoint that was particularly popular in Europe and America from 1804 to 1875. [1]: 66 It is typically executed with wool yarn on canvas, [2] worked in a single stitch such as cross stitch or tent stitch, although Beeton's book of Needlework (1870) describes 15 different stitches for use in Berlin work.
Evaporative-pattern casting is a type of casting process that uses a pattern made from a material that will evaporate when the molten metal is poured into the molding cavity. The most common evaporative-pattern material used is polystyrene foam. [1] The two major evaporative-pattern casting processes are: [1] Lost-foam casting; Full-mold casting
Full-mold casting is an evaporative-pattern casting process which is a combination of sand casting and lost-foam casting. It uses an expanded polystyrene foam pattern which is then surrounded by sand, much like sand casting. The metal is then poured directly into the mold, which vaporizes the foam upon contact. Full-mold casting
An American sampler: "Margaret Barnholt her sampler done in the twelth [sic] year of her age 1831". English band sampler featuring 'boxers', c. 1650 A needlework sampler is a piece of embroidery or cross-stitching produced as a 'specimen of achievement', [1] demonstration or a test of skill in needlework.
Produce wax patterns: Although called wax patterns, pattern materials may also include plastic and frozen mercury. [6] Wax patterns can be produced in one of two ways. In one process, the wax is poured into the mould and swished around until an even coating, usually about 3 mm (0.12 in) thick, covers the inner surface of the mould.
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