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Precision Metalforming Association or PMA is a trade association [1] representing the $137-billion metalforming industry of North America: the industry that creates precision metal products using stamping, fabricating, spinning, slide forming and roll forming technologies, and other value-added processes. PMA’s origin was the Pressed Metal ...
Rio Grande is a jewelry-making equipment, tools and supplies company located in Albuquerque, New Mexico. Founded in 1944 by jeweler Saul Bell, the company is run by Arien Gessner (CEO). Rio Grande, a Berkshire Hathaway Company since 2013, offers jewelry-making supplies.
Coining can be done using a gear driven press, a mechanical press, or more commonly, a hydraulically actuated press. Coining typically requires higher tonnage presses than stamping, because the workpiece is elastically deformed and not actually cut, as in some other forms of stamping. The coining process is preferred when there is a high tonnage.
Stamping (also known as pressing) is the process of placing flat sheet metal in either blank or coil form into a stamping press where a tool and die surface forms the metal into a net shape. Stamping includes a variety of sheet-metal forming manufacturing processes, such as punching using a machine press or stamping press , blanking, embossing ...
It bears the royal stamp ENRI. REX ("King Henry") but this was added later, in the reign of Henry III . The first legal definition of sterling silver appeared in 1275, when a statute of Edward I specified that 12 troy ounces of silver for coinage should contain 11 ounces 2 + 1 ⁄ 4 pennyweights of silver and 17 + 3 ⁄ 4 pennyweights of alloy ...
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