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Machine embroidery is used by hobbyists and crafters to decorate gifts, clothing, and home decor. Examples include designs on quilts, pillows, and wall hangings. There are multiple types of machine embroidery. Free-motion sewing machine embroidery uses a basic zigzag sewing machine. Designs are done manually.
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
Carbon dioxide (CO 2) is flooded through the frozen, open foam matrix to form carbonic acid (CO 2 +H 2 O→ H 2 CO 3). Much like the addition of sodium fluorosilicate (Na 2 SiF 6) in the Dunlop process, the carbonic acid lowers the pH, thereby causing gelation. In the next process step, vulcanization locks the foam into a uniform bubble ...
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
Flower-making foam is a thin sheet made of EVA, which is flexible, and is used by artists and craft makers to make artificial flowers. These foams are presented as raw sheets and they can be cut into the desired petal shape and then can be formed by ironing to assemble artificial flowers by putting these petals together.
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.
The company is best known for developing and releasing the files for the Liberator, the world's first completely 3D printed gun. [ 5 ] [ 6 ] On May 5, 2013, Defense Distributed made these printable STL files public, [ 7 ] and within days the United States Department of State demanded they be removed from the Internet, citing a violation of the ...