{"id":452,"date":"2018-12-09T16:34:18","date_gmt":"2018-12-10T00:34:18","guid":{"rendered":"https:\/\/www.simpits.org\/geneb\/?p=452"},"modified":"2018-12-09T16:34:18","modified_gmt":"2018-12-10T00:34:18","slug":"update-to-the-pitch-roll-gimbal","status":"publish","type":"post","link":"https:\/\/www.simpits.org\/geneb\/?p=452","title":{"rendered":"Update to the pitch &#038; roll gimbal."},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">I finally found a spare moment to make some adjustments to the pitch &amp; roll gimbal I designed for the Bf-109K4 project.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Below is a rendering of the 2nd revision of the major components in the pitch &amp; roll axis assembly.\u00a0 The one shown in the later photos is revision 5.\u00a0 This whole gimbal assembly was designed based on photographs I obtained from a number of different Bf-109 revisions, so it&#8217;s kind of a &#8220;kitbash&#8221; of features from the E, G, and K models.\u00a0 Good enough for sim work. \ud83d\ude42<br><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"542\" src=\"https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/test-gimbal-assembly-rev-2-1024x542.jpg\" alt=\"\" class=\"wp-image-460\" srcset=\"https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/test-gimbal-assembly-rev-2-1024x542.jpg 1024w, https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/test-gimbal-assembly-rev-2-300x159.jpg 300w, https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/test-gimbal-assembly-rev-2-768x406.jpg 768w, https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/test-gimbal-assembly-rev-2.jpg 1726w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The existing gimbal used a pair of 608ZZ skate bearings to support the roll axis parts.&nbsp; This was fine, but wouldn&#8217;t permit me to tighten the &#8220;stack&#8221; of components that made up the roll axis.&nbsp; If you apply a side-load to a 608ZZ skate bearing, you&#8217;ll eventually tear up the bearing.&nbsp; They&#8217;re only really designed for radial loads.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here&#8217;s what the front of the original gimbal design looks like:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"723\" src=\"https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/original-bearing-position-1024x723.png\" alt=\"\" class=\"wp-image-456\" srcset=\"https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/original-bearing-position-1024x723.png 1024w, https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/original-bearing-position-300x212.png 300w, https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/original-bearing-position-768x542.png 768w, https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/original-bearing-position.png 1772w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Original gimbal design.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">I needed to tweak the design a bit in order to accommodate the thickness of the thrust bearing stack I&#8217;m using.\u00a0 The stack is 4mm thick, (washer, bearing, washer), so I needed to push the skate bearing back into the body of the &#8220;casting&#8221; by 4mm.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">I didn&#8217;t want to spend the 13+ hours it was going to take to reprint the whole part, so I &#8220;sunk&#8221; the whole part into the build plate, leaving only about 15mm sticking above the print surface.\u00a0 This allowed me to print a sample of the gimbal in about an hour.\u00a0 Here&#8217;s the revised example:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"648\" src=\"https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/new-bearing-pockets-1024x648.png\" alt=\"\" class=\"wp-image-455\" srcset=\"https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/new-bearing-pockets-1024x648.png 1024w, https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/new-bearing-pockets-300x190.png 300w, https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/new-bearing-pockets-768x486.png 768w, https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/new-bearing-pockets.png 1936w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>New bearing pocket design.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">As you can see, there&#8217;s a step where the thrust bearing will rest, over the top of the skate bearing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">First we start off with the skate bearing:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"663\" src=\"https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/skate-bearing-in-place-1024x663.png\" alt=\"\" class=\"wp-image-457\" srcset=\"https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/skate-bearing-in-place-1024x663.png 1024w, https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/skate-bearing-in-place-300x194.png 300w, https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/skate-bearing-in-place-768x497.png 768w, https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/skate-bearing-in-place.png 1932w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Skate bearing installed.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The bearing is just a little loose in the pocket &#8211; that&#8217;s fine for this application.\u00a0 Next, the first thrust bearing washer goes in.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"789\" src=\"https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/thrust-washer-over-skate-bearing-1024x789.png\" alt=\"\" class=\"wp-image-459\" srcset=\"https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/thrust-washer-over-skate-bearing-1024x789.png 1024w, https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/thrust-washer-over-skate-bearing-300x231.png 300w, https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/thrust-washer-over-skate-bearing-768x592.png 768w, https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/thrust-washer-over-skate-bearing.png 1709w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>1st thrust bearing washer installed.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Next comes the thrust bearing itself.\u00a0 It&#8217;s made up of 13 needle bearings. I chose this type of thrust bearing over a tapered thrust bearing due to cost &amp; size.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"872\" src=\"https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/thrust-bearing-installed-1024x872.png\" alt=\"\" class=\"wp-image-458\" srcset=\"https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/thrust-bearing-installed-1024x872.png 1024w, https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/thrust-bearing-installed-300x255.png 300w, https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/thrust-bearing-installed-768x654.png 768w, https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/thrust-bearing-installed.png 1486w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Thrust bearing in place.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Finally, the last thrust bearing washer is installed.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"958\" height=\"1024\" src=\"https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/final-thrust-bearing-washer-958x1024.png\" alt=\"\" class=\"wp-image-454\" srcset=\"https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/final-thrust-bearing-washer-958x1024.png 958w, https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/final-thrust-bearing-washer-281x300.png 281w, https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/final-thrust-bearing-washer-768x821.png 768w, https:\/\/www.simpits.org\/geneb\/wp-content\/uploads\/2018\/12\/final-thrust-bearing-washer.png 1279w\" sizes=\"auto, (max-width: 958px) 100vw, 958px\" \/><figcaption>Final assembly.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">I&#8217;m using a 5\/16&#8243; bolt as the roll axis shaft inside this gimbal and the addition of this thrust bearing, plus one at the other end, will allow me to fully tighten the whole assembly.\u00a0 Now I won&#8217;t have to worry about it slipping or crushing the races in the skate bearings.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>I finally found a spare moment to make some adjustments to the pitch &amp; roll gimbal I designed for the Bf-109K4 project. Below is a rendering of the 2nd revision of the major components in the pitch &amp; roll axis assembly.\u00a0 The one shown in the later photos is revision 5.\u00a0 This whole gimbal assembly [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-452","post","type-post","status-publish","format-standard","hentry","category-bf-109k4"],"_links":{"self":[{"href":"https:\/\/www.simpits.org\/geneb\/index.php?rest_route=\/wp\/v2\/posts\/452","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.simpits.org\/geneb\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.simpits.org\/geneb\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.simpits.org\/geneb\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.simpits.org\/geneb\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=452"}],"version-history":[{"count":2,"href":"https:\/\/www.simpits.org\/geneb\/index.php?rest_route=\/wp\/v2\/posts\/452\/revisions"}],"predecessor-version":[{"id":461,"href":"https:\/\/www.simpits.org\/geneb\/index.php?rest_route=\/wp\/v2\/posts\/452\/revisions\/461"}],"wp:attachment":[{"href":"https:\/\/www.simpits.org\/geneb\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=452"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.simpits.org\/geneb\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=452"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.simpits.org\/geneb\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=452"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}