{"id":46,"date":"2023-03-08T12:25:28","date_gmt":"2023-03-08T17:25:28","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/level4layout\/?post_type=chapter&p=46"},"modified":"2023-03-31T10:30:55","modified_gmt":"2023-03-31T14:30:55","slug":"large-round-elbow","status":"publish","type":"chapter","link":"https:\/\/pressbooks.bccampus.ca\/level4layout\/chapter\/large-round-elbow\/","title":{"raw":"Large Round Elbow","rendered":"Large Round Elbow"},"content":{"raw":"https:\/\/www.youtube.com\/watch?v=pijuMu23VLQ\r\n\r\n \r\n\r\n \r\n\r\nWhen elbows or other round fittings, get too large, 12 divisions is no longer appropriate for the stretch-out. More divisions are required because the spacing of 12 becomes too great. Try and choose a number of divisions which keeps the spacing around 2\u201d, so accuracy remains. We will layout using a quarter circle since the same quarter repeats in the pattern.\r\n\r\n \r\n\r\n \r\n
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  1. Calculate the seam height<\/strong> and rise radius<\/strong> of the elbow<\/li>\r\n<\/ol>\r\n \r\n\r\n \r\n
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    1. Calculate the blank size<\/strong> for the elbow<\/li>\r\n<\/ol>\r\n \r\n\r\n \r\n
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      1. Based on the stretch-out<\/strong>, choose a number of divisions approximately 2\u201d apart. For our example, we will use 40<\/li>\r\n<\/ol>\r\n \r\n\r\n \r\n
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        1. Draw \u00bc circle of the rise radius<\/strong><\/li>\r\n<\/ol>\r\n \r\n\r\n \r\n
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          1. Divide the quarter circle into \u00bc of the divisions as you have chosen. For this example we\u2019re using 10 divisions per quarter<\/li>\r\n<\/ol>\r\n \r\n\r\n \r\n
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            1. If we look at the baseline as 0\u00b0, every division will increase the angle 9\u00b0<\/li>\r\n<\/ol>\r\n \r\n\r\n \r\n
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              1. Using trigonometry, calculate the height at each division. This will give us 10 different numbers, starting with 0 and ending with the seam height for #10<\/li>\r\n<\/ol>\r\n \r\n\r\n \r\n
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                1. Because we are talking about a large elbow, it will be too big to draw, so we will sketch it or cut the metal you will be using to make the elbow<\/li>\r\n<\/ol>\r\n \r\n\r\n \r\n
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                  1. Divide the stretch-out<\/strong> into the desired number, for this example it\u2019s 40<\/li>\r\n<\/ol>\r\n \r\n\r\n \r\n
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                    1. Label each quarter of the stretch-out<\/strong> using your division numbers we will use 1-10. Think of the \u201cfish\u201d pattern of an elbow and consider it in quarters. It goes from the seam height to the top line then back to the seam, then below the seam until the bottom line, then back to the seam height. The quarter pattern repeats, but flips.<\/strong><\/li>\r\n<\/ol>\r\n \r\n\r\n \r\n
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                      1. Using the calculated division heights, transfer those heights to the corresponding stretch-out<\/strong> number<\/li>\r\n<\/ol>\r\n \r\n\r\n \r\n
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                        1. Draw in the miter line<\/strong> to complete the pattern<\/li>\r\n<\/ol>","rendered":"