{"id":80,"date":"2005-08-31T00:00:16","date_gmt":"2005-08-31T05:00:16","guid":{"rendered":"http:\/\/scope-eye.net\/?p=80"},"modified":"2008-10-21T12:25:00","modified_gmt":"2008-10-21T16:25:00","slug":"new-elbow-joints","status":"publish","type":"post","link":"https:\/\/scope-eye.net\/?p=80","title":{"rendered":"New Elbow Joints"},"content":{"rendered":"<p>The Otakon deadline has come and gone, of course, and Patcon       is coming up, most likely to zoom by me before I can finish       this project.  I&#8217;ve decided that I&#8217;m not entirely happy with       the original elbow joints that I made (though I think they       were nice work, and it&#8217;s great to see how simply something       like that can be accomplished &#8211; I just really feel the       precision on my projects ought to be better than that.) so I&#8217;m       working on new ones (to be recast) using the last two 14mm       hemispheres I have on hand.  I have ordered more hemispheres,       but with a little luck I ought to be able to get by with what       I&#8217;ve got.<\/p>\n<p>The big change in this effort is that I&#8217;m now using the       Dremel as a way to check the alignment of the hemisphere       relative to the rod, and to correct it.  My first attempt with       this technique involved mounting the hemisphere on the rod,       then chucking it into the Dremel and sanding it down until it       was centered.  This reduced the diameter of the part from 14mm       to 13mm, and I&#8217;m concerned about the resulting part&#8217;s       uniformity as a sphere.  But this part is very far along at       this point &#8211; I scribed lines in it by holding a razor saw to       it as it spun, and I puttied some minor mistakes and primed it       to check the surface &#8211; it needs some more work but if I decide       to move forward with it, it&#8217;s nearly ready.<\/p>\n<p>My second (and last, until I get that order of hemisphere       parts) attempt at this was done by first sandwiching 3mm worth       of plastic plate, drilling a hole in it, and mounting       <em>that<\/em> to the rod.  Then it was chucked into the Dremel       and sanded down until it fit inside one of the hemisphere       parts.  From there, the hemisphere part was carefully aligned       on top of the shaped styrene.  Alignment was checked using a       pencil touched to the hemisphere while it was spinning.  (If       the hemisphere was off-axis, the pencil would make contact       with just one side of the hemisphere.  If the hemisphere was       on-axis, the pencil would make a complete circle around the       part, or close to it, and that circle could be checked to       ensure it was parallel to the edge of the hemisphere.)  Minor       alignment issues were corrected by sanding the outside of the       hemisphere as it was spinning.  I think with a little luck       this version of the part will work out nicely.<\/p>\n<p>My plan is to complete this hemisphere-on-a-stick part and       scribe two lines in it on the Dremel &#8211; one about 20 degrees       from the planar side and one about 20 degrees from the axis &#8211;       the idea being that for different projects I could fill in       these lines or take advantage of them, as needed.  Then the       part will be recast, and the castings will be performed in       different ways in order to create both the male part and the       female part of the hinge from the same mold.  If the first       mold works out, then I&#8217;d like to alter some of the cast parts       from the mold to pursue my 3-part hinge idea.<br \/>\n<a href=\"\/model-data\/1_144_Sumo\/sumo_050831_13mm_elbow_master.jpeg\"><img decoding=\"async\" src=\"\/model-data\/1_144_Sumo\/sumo_050831_13mm_elbow_master_thumb.png\" alt=\"13mm part (primed)\" \/><\/a><a href=\"\/model-data\/1_144_Sumo\/sumo_050831_new_14mm_elbow_1.jpeg\"><img decoding=\"async\" src=\"\/model-data\/1_144_Sumo\/sumo_050831_new_14mm_elbow_1_thumb.png\" alt=\"New elbow part starting point\" \/><\/a><a href=\"\/model-data\/1_144_Sumo\/sumo_050831_dremel_lathed_disc.jpeg\"><img decoding=\"async\" src=\"\/model-data\/1_144_Sumo\/sumo_050831_dremel_lathed_disc_thumb.png\" alt=\"Spin-sanded disc on a stick\" \/><\/a><a href=\"\/model-data\/1_144_Sumo\/sumo_050831_new_14mm_elbow_2.jpeg\"><img decoding=\"async\" src=\"\/model-data\/1_144_Sumo\/sumo_050831_new_14mm_elbow_2_thumb.png\" alt=\"New elbow part (current state, with pencil lines)\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Otakon deadline has come and gone, of course, and Patcon is coming up, most likely to zoom by me before I can finish this project. I&#8217;ve decided that I&#8217;m not entirely happy with the original elbow joints that I made (though I think they were nice work, and it&#8217;s great to see how simply [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[14],"_links":{"self":[{"href":"https:\/\/scope-eye.net\/index.php?rest_route=\/wp\/v2\/posts\/80"}],"collection":[{"href":"https:\/\/scope-eye.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/scope-eye.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/scope-eye.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/scope-eye.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=80"}],"version-history":[{"count":1,"href":"https:\/\/scope-eye.net\/index.php?rest_route=\/wp\/v2\/posts\/80\/revisions"}],"predecessor-version":[{"id":247,"href":"https:\/\/scope-eye.net\/index.php?rest_route=\/wp\/v2\/posts\/80\/revisions\/247"}],"wp:attachment":[{"href":"https:\/\/scope-eye.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=80"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/scope-eye.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=80"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/scope-eye.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=80"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}