{"id":115,"date":"2009-04-01T11:02:13","date_gmt":"2009-04-01T18:02:13","guid":{"rendered":"http:\/\/www.capitaltreasures.net\/blog\/?p=115"},"modified":"2009-04-01T11:02:13","modified_gmt":"2009-04-01T18:02:13","slug":"bi-metallic-coins","status":"publish","type":"post","link":"http:\/\/www.capitaltreasures.net\/blog\/?p=115","title":{"rendered":"Bi-Metallic Coins"},"content":{"rendered":"<p><a title=\"Core77\" href=\"http:\/\/www.core77.com\" target=\"_blank\">Core77<\/a> follows up their recent write-up on <strong><a href=\"http:\/\/www.core77.com\/blog\/object_culture\/production_methods_coining_12577.asp\" target=\"_blank\">Production Methods<\/a><\/strong> with a quick overview on bi-metallic coins. If you&#8217;ve ever wondered how they make bimetallic coins, here&#8217;s the process. They start by punching a hole through a coin blank, or planchet. The core will be remelted for another batch, and the remaining part becomes the &#8220;ring,&#8221; or outer, planchet.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/s3files.core77.com\/blog\/images\/0bimetalliccoins07.jpg\" alt=\"0bimetalliccoins07.jpg\" width=\"468\" height=\"130\" \/><\/p>\n<p>Next they take the &#8220;core&#8221; planchet, which is made from a different metal and sized to fit inside the ring, and they mill a groove all the way around the edge of it.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/s3files.core77.com\/blog\/images\/0bimetalliccoins08.jpg\" alt=\"0bimetalliccoins08.jpg\" width=\"468\" height=\"240\" \/><\/p>\n<p>Why this method&#8230;So that when the press slams shut on the assembled parts, stamping a relief into it, the inside edge of the ring also deforms and spreads into the groove, locking it into place. Now that puppy&#8217;s not going anywhere, and you&#8217;ve got your purty two-tone coin.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/s3files.core77.com\/blog\/images\/0bimetalliccoins09.jpg\" alt=\"0bimetalliccoins09.jpg\" width=\"159\" height=\"159\" \/><\/p>\n<p>You can get some cool-looking accidents. Below are photos of some defective coins where the hole in the ring blank was not perfectly centered, resulting in what you see here. Although these don&#8217;t quite meet the standards, coin collectors have a fondness for goofy oddities produced in the manufacturing process and there is quite a number of error collectors out there.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/s3files.core77.com\/blog\/images\/0bimetalliccoins10.jpg\" alt=\"0bimetalliccoins10.jpg\" width=\"232\" height=\"351\" \/><\/p>\n<p><strong>For more on coining, check out <a href=\"http:\/\/www.core77.com\/blog\/object_culture\/production_methods_coining_12577.asp\" target=\"_blank\">Core77&#8217;s Production Methods entry.<\/a><\/strong><\/p>\n<p>[photo credits: <a href=\"http:\/\/flickr.com\/photos\/photoshoparama\/850120887\/\" target=\"_blank\">Flickr user photoshoparama<\/a>, <a href=\"http:\/\/www.wcoins.com\/Coins-Bimetal.htm\" target=\"_blank\">world coins<\/a>, <a href=\"http:\/\/www.bencoins.com\/bimetallics\/\" target=\"_blank\">wbcc errors image library<\/a>, <a href=\"http:\/\/en.wikipedia.org\/wiki\/Bi-metallic_coins\" target=\"_blank\">wikipedia<\/a>]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Core77 follows up their recent write-up on Production Methods with a quick overview on bi-metallic coins. If you&#8217;ve ever wondered how they make bimetallic coins, here&#8217;s the process. They start by punching a hole through a coin blank, or planchet. The core will be remelted for another batch, and the remaining part becomes the &#8220;ring,&#8221; [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[70,71,6,93],"class_list":["post-115","post","type-post","status-publish","format-standard","hentry","category-general","tag-coins","tag-collections","tag-error","tag-world-coins"],"_links":{"self":[{"href":"http:\/\/www.capitaltreasures.net\/blog\/index.php?rest_route=\/wp\/v2\/posts\/115","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.capitaltreasures.net\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.capitaltreasures.net\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.capitaltreasures.net\/blog\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"http:\/\/www.capitaltreasures.net\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=115"}],"version-history":[{"count":2,"href":"http:\/\/www.capitaltreasures.net\/blog\/index.php?rest_route=\/wp\/v2\/posts\/115\/revisions"}],"predecessor-version":[{"id":117,"href":"http:\/\/www.capitaltreasures.net\/blog\/index.php?rest_route=\/wp\/v2\/posts\/115\/revisions\/117"}],"wp:attachment":[{"href":"http:\/\/www.capitaltreasures.net\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=115"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.capitaltreasures.net\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=115"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.capitaltreasures.net\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=115"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}