{"id":24,"date":"2021-12-01T15:45:07","date_gmt":"2021-12-01T20:45:07","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/ductfittings\/?post_type=chapter&#038;p=24"},"modified":"2022-08-15T12:55:57","modified_gmt":"2022-08-15T16:55:57","slug":"radius-throat-radius-heel-elbow","status":"publish","type":"chapter","link":"https:\/\/pressbooks.bccampus.ca\/ductfittings\/chapter\/radius-throat-radius-heel-elbow\/","title":{"raw":"Radius Throat-Radius Heel Elbow-No Seams","rendered":"Radius Throat-Radius Heel Elbow-No Seams"},"content":{"raw":"<ol>\r\n \t<li>[embed]http:\/\/www.youtube.com\/watch?v=CPng0V7MdGM[\/embed]\r\n\r\nStudy the shop drawing. Remember that the first number for the duct size is always what we \u201csee in the view\u201d. The second number is the depth, or hidden view\r\n\r\n<img class=\"alignnone size-full wp-image-72\" src=\"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-content\/uploads\/sites\/1571\/2021\/12\/4.1-Radius-Throat-Radius-Heel-Elbow-Drawing.gif\" alt=\"\" width=\"640\" height=\"480\" \/><\/li>\r\n \t<li>Calculate the blank sizes\r\n<ul>\r\n \t<li><strong>Cheek<\/strong>\r\n<ul>\r\n \t<li>The drawing shows an opening size of 4\u201d wide and a throat radius of 4\u201d. So the horizontal dimension is 8\u201d. Because the fitting is symmetrical, the vertical dimension is the same, 8\u201d. Our blank size is <strong>8\u201dx 8\u201d\r\n<img class=\"alignnone size-full wp-image-73\" src=\"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-content\/uploads\/sites\/1571\/2021\/12\/4.2a-Radius-Throat-Radius-Heel-Elbow-Cheek.gif\" alt=\"\" width=\"640\" height=\"480\" \/>\r\n\r\n\r\n<\/strong><\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Throat<\/strong>\r\n<ul>\r\n \t<li>The throat is shown as a 4\u201d radius. Using an arc length formula, we can compute as follows: R x 2 x \u03c0 x 90\u00b0\/360\u00b0. This gives us 6 5\/16\u201d. The second dimension comes from the depth of the opening, given at 6\u201d. So our blank size is <strong>6 5\/16\u201d x 6\u201d\r\n\r\n<img class=\"alignnone size-full wp-image-74\" src=\"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-content\/uploads\/sites\/1571\/2021\/12\/4.2b-Radius-Throat-Radius-Heel-Elbow-Throat.gif\" alt=\"\" width=\"640\" height=\"480\" \/>\r\n\r\n<\/strong><\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Heel<\/strong>\r\n<ul>\r\n \t<li>Because the throat is 4\u201d and the opening is 4\u201d, to get to the outside, where the heel sits, it is a radius of 8\u201d. Again we can use the arc length formula: R x 2 x \u03c0 x 90\u00b0\/360\u00b0 which gives us 12 9\/16\u201d. So our blank size is <strong>12 9\/16\u201d x 6\u201d\r\n\r\n<img class=\"alignnone size-full wp-image-75\" src=\"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-content\/uploads\/sites\/1571\/2021\/12\/4.2c-Radius-Throat-Radius-Heel-Elbow-Heel.gif\" alt=\"\" width=\"640\" height=\"480\" \/>\r\n<\/strong><\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li>Draw or shear the blanks. <strong>We\u2019ll only draw out the cheek in this case because there is no layout to the heel or throat. If we were in the shop, we would be shearing all of the blank sizes\r\n\r\n<img class=\"alignnone size-full wp-image-76\" src=\"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-content\/uploads\/sites\/1571\/2021\/12\/4.3-Radius-Throat-Radius-Heel-Elbow-Cheek-Drawing.gif\" alt=\"\" width=\"640\" height=\"480\" \/>\r\n<\/strong><\/li>\r\n \t<li>Mark the cheek with an arrow for airflow. <strong>If you had sheared all the blanks, you would mark them all for airflow\r\n\r\n<img class=\"alignnone size-full wp-image-77\" src=\"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-content\/uploads\/sites\/1571\/2021\/12\/4.4-Radius-Throat-Radius-Heel-Elbow-Airflow.gif\" alt=\"\" width=\"640\" height=\"480\" \/>\r\n<\/strong><\/li>\r\n \t<li>From the outside, mark the opening at 4\u201d. <strong>Notice we always mark the opening, it is the most important feature of the fitting.\r\n\r\n<img class=\"alignnone size-full wp-image-78\" src=\"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-content\/uploads\/sites\/1571\/2021\/12\/4.5-Radius-Throat-Radius-Heel-Elbow-Mark-Opening.gif\" alt=\"\" width=\"640\" height=\"480\" \/>\r\n<\/strong><\/li>\r\n \t<li>Swing the arcs. Set you compass from the lower right corner (radius point) to the very outside (<strong>heel<\/strong>) and swing an arc. Then adjust the compass to the inside of the opening (<strong>throat<\/strong>) and swing another arc from the same radius point. <strong>In this case we have swung an 8\u201d and a 4\u201d radius\r\n\r\n<img class=\"alignnone size-full wp-image-79\" src=\"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-content\/uploads\/sites\/1571\/2021\/12\/4.6-Radius-Throat-Radius-Heel-Elbow-Swing-the-Arcs.gif\" alt=\"\" width=\"640\" height=\"480\" \/>\r\n<\/strong><\/li>\r\n<\/ol>","rendered":"<ol>\n<li><iframe loading=\"lazy\" id=\"oembed-1\" title=\"RTRH Elbow\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/CPng0V7MdGM?feature=oembed&#38;rel=0\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe>\n<p>Study the shop drawing. Remember that the first number for the duct size is always what we \u201csee in the view\u201d. The second number is the depth, or hidden view<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-72\" src=\"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-content\/uploads\/sites\/1571\/2021\/12\/4.1-Radius-Throat-Radius-Heel-Elbow-Drawing.gif\" alt=\"\" width=\"640\" height=\"480\" \/><\/li>\n<li>Calculate the blank sizes\n<ul>\n<li><strong>Cheek<\/strong>\n<ul>\n<li>The drawing shows an opening size of 4\u201d wide and a throat radius of 4\u201d. So the horizontal dimension is 8\u201d. Because the fitting is symmetrical, the vertical dimension is the same, 8\u201d. Our blank size is <strong>8\u201dx 8\u201d<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-73\" src=\"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-content\/uploads\/sites\/1571\/2021\/12\/4.2a-Radius-Throat-Radius-Heel-Elbow-Cheek.gif\" alt=\"\" width=\"640\" height=\"480\" \/><\/p>\n<p><\/strong><\/li>\n<\/ul>\n<\/li>\n<li><strong>Throat<\/strong>\n<ul>\n<li>The throat is shown as a 4\u201d radius. Using an arc length formula, we can compute as follows: R x 2 x \u03c0 x 90\u00b0\/360\u00b0. This gives us 6 5\/16\u201d. The second dimension comes from the depth of the opening, given at 6\u201d. So our blank size is <strong>6 5\/16\u201d x 6\u201d\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-74\" src=\"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-content\/uploads\/sites\/1571\/2021\/12\/4.2b-Radius-Throat-Radius-Heel-Elbow-Throat.gif\" alt=\"\" width=\"640\" height=\"480\" \/><\/p>\n<p><\/strong><\/li>\n<\/ul>\n<\/li>\n<li><strong>Heel<\/strong>\n<ul>\n<li>Because the throat is 4\u201d and the opening is 4\u201d, to get to the outside, where the heel sits, it is a radius of 8\u201d. Again we can use the arc length formula: R x 2 x \u03c0 x 90\u00b0\/360\u00b0 which gives us 12 9\/16\u201d. So our blank size is <strong>12 9\/16\u201d x 6\u201d\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-75\" src=\"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-content\/uploads\/sites\/1571\/2021\/12\/4.2c-Radius-Throat-Radius-Heel-Elbow-Heel.gif\" alt=\"\" width=\"640\" height=\"480\" \/><br \/>\n<\/strong><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>Draw or shear the blanks. <strong>We\u2019ll only draw out the cheek in this case because there is no layout to the heel or throat. If we were in the shop, we would be shearing all of the blank sizes\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-76\" src=\"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-content\/uploads\/sites\/1571\/2021\/12\/4.3-Radius-Throat-Radius-Heel-Elbow-Cheek-Drawing.gif\" alt=\"\" width=\"640\" height=\"480\" \/><br \/>\n<\/strong><\/li>\n<li>Mark the cheek with an arrow for airflow. <strong>If you had sheared all the blanks, you would mark them all for airflow\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-77\" src=\"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-content\/uploads\/sites\/1571\/2021\/12\/4.4-Radius-Throat-Radius-Heel-Elbow-Airflow.gif\" alt=\"\" width=\"640\" height=\"480\" \/><br \/>\n<\/strong><\/li>\n<li>From the outside, mark the opening at 4\u201d. <strong>Notice we always mark the opening, it is the most important feature of the fitting.\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-78\" src=\"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-content\/uploads\/sites\/1571\/2021\/12\/4.5-Radius-Throat-Radius-Heel-Elbow-Mark-Opening.gif\" alt=\"\" width=\"640\" height=\"480\" \/><br \/>\n<\/strong><\/li>\n<li>Swing the arcs. Set you compass from the lower right corner (radius point) to the very outside (<strong>heel<\/strong>) and swing an arc. Then adjust the compass to the inside of the opening (<strong>throat<\/strong>) and swing another arc from the same radius point. <strong>In this case we have swung an 8\u201d and a 4\u201d radius\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-79\" src=\"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-content\/uploads\/sites\/1571\/2021\/12\/4.6-Radius-Throat-Radius-Heel-Elbow-Swing-the-Arcs.gif\" alt=\"\" width=\"640\" height=\"480\" \/><br \/>\n<\/strong><\/li>\n<\/ol>\n","protected":false},"author":1078,"menu_order":2,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-24","chapter","type-chapter","status-publish","hentry"],"part":3,"_links":{"self":[{"href":"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-json\/pressbooks\/v2\/chapters\/24","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-json\/wp\/v2\/users\/1078"}],"version-history":[{"count":6,"href":"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-json\/pressbooks\/v2\/chapters\/24\/revisions"}],"predecessor-version":[{"id":81,"href":"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-json\/pressbooks\/v2\/chapters\/24\/revisions\/81"}],"part":[{"href":"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-json\/pressbooks\/v2\/parts\/3"}],"metadata":[{"href":"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-json\/pressbooks\/v2\/chapters\/24\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-json\/wp\/v2\/media?parent=24"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-json\/pressbooks\/v2\/chapter-type?post=24"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-json\/wp\/v2\/contributor?post=24"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/ductfittings\/wp-json\/wp\/v2\/license?post=24"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}