{"id":191,"date":"2013-04-04T21:34:24","date_gmt":"2013-04-05T05:34:24","guid":{"rendered":"http:\/\/schminktronics.com\/blog\/?p=191"},"modified":"2013-04-04T21:39:09","modified_gmt":"2013-04-05T05:39:09","slug":"more-tests","status":"publish","type":"post","link":"http:\/\/schminktronics.com\/blog\/archives\/191","title":{"rendered":"More tests"},"content":{"rendered":"<p>Since it will be \u00a0a while before my new coil design is ready, I took the take to get my test platform setup:<\/p>\n<p><a href=\"http:\/\/schminktronics.com\/blog\/wp-content\/uploads\/2013\/04\/2013-04-03_17-19-03_623.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-192\" alt=\"ElectroMagnet Test Platform\" src=\"http:\/\/schminktronics.com\/blog\/wp-content\/uploads\/2013\/04\/2013-04-03_17-19-03_623-1024x576.jpg\" width=\"584\" height=\"328\" srcset=\"http:\/\/schminktronics.com\/blog\/wp-content\/uploads\/2013\/04\/2013-04-03_17-19-03_623-1024x576.jpg 1024w, http:\/\/schminktronics.com\/blog\/wp-content\/uploads\/2013\/04\/2013-04-03_17-19-03_623-300x168.jpg 300w, http:\/\/schminktronics.com\/blog\/wp-content\/uploads\/2013\/04\/2013-04-03_17-19-03_623-500x281.jpg 500w\" sizes=\"auto, (max-width: 584px) 100vw, 584px\" \/><\/a><\/p>\n<p>This gives me a switch so I can turn each coil on and off independently. It also lets me turn them all off and adjust the voltage accurately before applying power to the coils again.<\/p>\n<p>Just like on my spinner platform, these switches made things work much better! I don&#8217;t have the coil secured (waiting on my new coil design with mounting points for that), but I was still able to learn some things.<\/p>\n<p>First, using the coil that is slightly larger than the other, I did tests to see how much current I can push through there. And again I kept my temperature probe on the coil so I could monitor if it was getting too hot. Better picture here:<\/p>\n<p><a href=\"http:\/\/schminktronics.com\/blog\/wp-content\/uploads\/2013\/04\/2013-04-03_17-32-17_878.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-193\" alt=\"Coil Test Closeup\" src=\"http:\/\/schminktronics.com\/blog\/wp-content\/uploads\/2013\/04\/2013-04-03_17-32-17_878-1024x576.jpg\" width=\"584\" height=\"328\" srcset=\"http:\/\/schminktronics.com\/blog\/wp-content\/uploads\/2013\/04\/2013-04-03_17-32-17_878-1024x576.jpg 1024w, http:\/\/schminktronics.com\/blog\/wp-content\/uploads\/2013\/04\/2013-04-03_17-32-17_878-300x168.jpg 300w, http:\/\/schminktronics.com\/blog\/wp-content\/uploads\/2013\/04\/2013-04-03_17-32-17_878-500x281.jpg 500w\" sizes=\"auto, (max-width: 584px) 100vw, 584px\" \/><\/a><\/p>\n<p>I ended up with this:<\/p>\n<div class=\"table-responsive\"><table  style=\"width:100%; \"  class=\"easy-table easy-table-default \" border=\"0\">\n<thead>\r\n<tr><th >5V<\/th>\n<th >10V<\/th>\n<th >12V<\/th>\n<th >15V<\/th>\n<th >20V<\/th>\n<\/tr>\n<\/thead>\n<tbody>\r\n<tr><td >0.64A (84\u00b0F)<\/td>\n<td >1.25A (100\u00b0F)<\/td>\n<td >1.40A (120\u00b0F)<\/td>\n<td >1.60+A (HOT)<\/td>\n<td >2.0+A (170+\u00b0F)<\/td>\n<\/tr>\n<\/tbody><\/table><\/div>\n<p>My notes from things I tested:<\/p>\n<ul>\n<li>Switching between the two coils, I was unable to get the nail to move back and forth, no matter what voltage I used. (I later learned this may be due to the length of the nail.)<\/li>\n<li>It takes a long time for the coils to cool. Even brief pulses at 15V cause the temperature to shoot up to 130\u00b0.<\/li>\n<li>I tried using a scale to measure how much force the electromagnet exerts. Most of the tests, I got absolutely nothing. While playing with 20V, I noticed that I got a strong pull right when the end of the nail was coming out of the coil. I measured that at 60 grams. (I&#8217;m not sure what force that is&#8211;I suppose the equivalent force that it takes to pull 60 grams against gravity.)<\/li>\n<li>At 10V, there is no noticeable pull on the nail. I&#8217;m not sure how little I can feel, but I&#8217;m sure this is quite light.<\/li>\n<\/ul>\n<p>Checking in with the <a href=\"http:\/\/www.shapeways.com\/materials\/strong-flexible\">Shapeways design specs<\/a>, I see that the flexible plastic is only heatproof to 176\u00b0F. This is clearly a problem as it quickly gets that hot at the minimum voltage that I felt a significant pull.<\/p>\n<p>I need to try either other wire sizes, better heat sinking materials, or a different design.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Since it will be \u00a0a while before my new coil design is ready, I took the take to get my test platform setup: This gives me a switch so I can turn each coil on and off independently. It also &hellip; <a href=\"http:\/\/schminktronics.com\/blog\/archives\/191\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-191","post","type-post","status-publish","format-standard","hentry","category-em-tests"],"_links":{"self":[{"href":"http:\/\/schminktronics.com\/blog\/wp-json\/wp\/v2\/posts\/191","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/schminktronics.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/schminktronics.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/schminktronics.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/schminktronics.com\/blog\/wp-json\/wp\/v2\/comments?post=191"}],"version-history":[{"count":3,"href":"http:\/\/schminktronics.com\/blog\/wp-json\/wp\/v2\/posts\/191\/revisions"}],"predecessor-version":[{"id":196,"href":"http:\/\/schminktronics.com\/blog\/wp-json\/wp\/v2\/posts\/191\/revisions\/196"}],"wp:attachment":[{"href":"http:\/\/schminktronics.com\/blog\/wp-json\/wp\/v2\/media?parent=191"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/schminktronics.com\/blog\/wp-json\/wp\/v2\/categories?post=191"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/schminktronics.com\/blog\/wp-json\/wp\/v2\/tags?post=191"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}