{"id":178,"date":"2008-05-29T02:37:32","date_gmt":"2008-05-29T06:37:32","guid":{"rendered":"http:\/\/www.etotheipiplusone.net\/?p=178"},"modified":"2008-06-01T03:23:52","modified_gmt":"2008-06-01T07:23:52","slug":"pop-quiz-2-update-3","status":"publish","type":"post","link":"https:\/\/www.etotheipiplusone.net\/?p=178","title":{"rendered":"Pop Quiz 2 Update 4"},"content":{"rendered":"<p>Now that the lathe is better equipped to produce shiny, round objects, it was time to get back to work on Pop Quiz. Having a better tooling stup dramatically improved efficiency, and I was able to complete the motor mechanics today. Now I just await my SDP-SI order for the bearings and some shoulder screws.<\/p>\n<p>Oh, and I also discovered that the lathe does indeed have back gears. They were rather well hidden, but now the operations which need &lt;180 RPM at the spindle can happen<\/p>\n<p style=\"text-align: center;\"><a href=\"\/pics\/pq2\/pq2_21.jpg\"><img decoding=\"async\" class=\"aligncenter\" src=\"\/pics\/pq2\/pq2_21-mid.jpg\" alt=\"\" \/><\/a><\/p>\n<p>Boring out the 1\/4&#8243;-walled steel tube to form the motor can, using the not-boring-bar.<\/p>\n<p style=\"text-align: center;\"><a href=\"\/pics\/pq2\/pq2_22.jpg\"><img decoding=\"async\" src=\"\/pics\/pq2\/pq2_22-mid.jpg\" alt=\"\" \/><\/a><\/p>\n<p>A stiff toolpost does wonders for surface finish and accuracy. Here&#8217;s the finished can.<\/p>\n<p style=\"text-align: center;\"><a href=\"\/pics\/pq2\/pq2_23.jpg\"><img decoding=\"async\" src=\"\/pics\/pq2\/pq2_23-mid.jpg\" alt=\"\" \/><\/a><\/p>\n<p>Next up was the motor mounting base and the hub for the can. I dug up the micrometer depth stop which helped stop the carriage at a repeatable, set distance. This meant I could manually feed using the carriage handwheel and not the compound slide, which eliminates the risk of accidentally cutting a taper. A DRO would make this unnecessary, but&#8230;<\/p>\n<p style=\"text-align: center;\"><a href=\"\/pics\/pq2\/pq2_24.jpg\"><img decoding=\"async\" src=\"\/pics\/pq2\/pq2_24-mid.jpg\" alt=\"\" \/><\/a><\/p>\n<p>The mounting base begins to take shape&#8230; The same shape as the first try, but with provisions for mounting two stators stacked on eachother.<\/p>\n<p style=\"text-align: center;\"><a href=\"\/pics\/pq2\/pq2_25.jpg\"><img decoding=\"async\" src=\"\/pics\/pq2\/pq2_25-mid.jpg\" alt=\"\" \/><\/a><\/p>\n<p>After cutting that part off (with a real cutoff blade!), I started working on the can hub. This involved two precarious internal boring operations. The larger one I could take care of using the not-boring-bar, but it couldn&#8217;t fit into the 1\/4&#8243; starting hole for making the circular bearing pockets (which are only 3\/8&#8243; in diameter anyway)<\/p>\n<p>I should have bored these small holes on the milling machine, but instead I took the risk and used a 3\/8&#8243; endmill in the tailstock chuck. Oddly enough, it came out way *UNDERSIZED*, at .365 or so. This is weird. Very, very weird. What the deuce?<\/p>\n<p style=\"text-align: center;\"><a href=\"\/pics\/pq2\/pq2_26.jpg\"><img decoding=\"async\" src=\"\/pics\/pq2\/pq2_26-mid.jpg\" alt=\"\" \/><\/a><\/p>\n<p>The three completed pieces after processing. The can presses onto the hub, and is retained by a healthy dabble of green Loctite. The whole thing sits over the mounting base, and a shoulder screw threads through the hub and into the mounting base to keep the whole thing together. I didn&#8217;t make the exterior mounting ring as seen in the 3d drawing yet.<\/p>\n<p>Next steps: make the exterior mounting ring thing, as seen in the 3D rendering. Make a fixture for the UHMW slab chassis, then machine it. Get some carbon fiber and make the cover plates. Wait on Banebots and SDP-SI for the load of internal parts.<\/p>\n<p>Now that I have at least part of the machine tools I used the most before, things should go much smoother. Dragon*Con 08 will be here in no time&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Now that the lathe is better equipped to produce shiny, round objects, it was time to get back to work on Pop Quiz. Having a better tooling stup dramatically improved efficiency, and I was able to complete the motor mechanics today. Now I just await my SDP-SI order for the bearings and some shoulder screws. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,51,5],"tags":[],"class_list":["post-178","post","type-post","status-publish","format-standard","hentry","category-bots","category-pop-quiz-2-projects","category-project-build-reports"],"_links":{"self":[{"href":"https:\/\/www.etotheipiplusone.net\/index.php?rest_route=\/wp\/v2\/posts\/178","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.etotheipiplusone.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.etotheipiplusone.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.etotheipiplusone.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.etotheipiplusone.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=178"}],"version-history":[{"count":0,"href":"https:\/\/www.etotheipiplusone.net\/index.php?rest_route=\/wp\/v2\/posts\/178\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.etotheipiplusone.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=178"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.etotheipiplusone.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=178"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.etotheipiplusone.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=178"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}