{"id":441,"date":"2012-07-30T18:34:13","date_gmt":"2012-07-31T02:34:13","guid":{"rendered":"http:\/\/whiskeybeforebreakfast.wordpress.com\/?p=441"},"modified":"2015-06-18T13:43:17","modified_gmt":"2015-06-18T20:43:17","slug":"39-motion-studies","status":"publish","type":"post","link":"http:\/\/ckhollidayplans.com\/blog\/39-motion-studies\/","title":{"rendered":"39: motion studies"},"content":{"rendered":"<p>Here are some of the motion simulations that are possible in the computer.<\/p>\n<p>The first one is an extension of the eccentric motion I posted a while back. This time, the main and side rods have been put in place and the crossheads (and the hidden pistons) are now in motion. <\/p>\n<p><iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/x8rqb64V__0\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n<p>Some notes to observe:<\/p>\n<ul>\n<li>The motion simulates the engine running at about 2.5mph<\/li>\n<li>The offset of the two pistons is more obvious when watching the two crossheads move relative to each other<\/li>\n<li>The tendency for the lifting shaft, link, and the reverser bar (out of view) to nudge or swing &#8220;forward&#8221; as the wheels spin. This is why the reverser bar arc is notched. In the animation watch the lifting shaft carefully for this effect<\/li>\n<li>The mechanical lubricator link can be seen in the upper half of the animation. It&#8217;s driven off the left valve stem<\/li>\n<li>The empty slots at the crosshead\/piston rod junction will receive the piston\/crosshead key<\/li>\n<\/ul>\n<p>Next simulation is the throttle valve linkage. The throttle bar (left) is linked to a valve at the top of the dry pipe (L-shaped rising pipe, right). The valve is inside this pipe and when the throttle is closed, the valve sits snug in a seat in the dry pipe. When the throttle bar is pulled, the linkage causes the valve to &#8220;pop&#8221; open and allows steam in the steam dome to enter the dry pipe, then onto each cylinder and piston.<\/p>\n<p><iframe loading=\"lazy\" width=\"420\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/vywsOL2QFrk\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n<p>The yellow vertical pipe immediate behind (left) of the dry pipe is the header pipe, which takes steam from the steamdome into the cab to run appliances.<\/p>\n<p>And speaking of throttle, the next animation shows the throttle quadrant in action. The quadrant is notched, and a spring-loaded block with teeth &#8220;grabs&#8221; the notches to hold the throttle in place against the steam pressure acting on the throttle valve. <\/p>\n<p>It all looks simple, but there are a number of subtle movements, such as the moving quadrant and the pivot of the throttle bar.<\/p>\n<p><iframe loading=\"lazy\" width=\"420\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/ZIsUSro6Unc\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n<p>Note that to actually move the throttle, the engineer would grab the handle at the end to release the spring-loaded latching block from the quadrant. That action is not in the animation. The latching block simply slides along the edge of the quadrant instead. I used this motion to ensure that the latching block is concentric to the quadrant.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Here are some of the motion simulations that are possible in the computer. The first one is an extension of the eccentric motion I posted a while back. This time, the main and side rods have been put in place &hellip; <a href=\"http:\/\/ckhollidayplans.com\/blog\/39-motion-studies\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-441","post","type-post","status-publish","format-standard","hentry","category-ck-holliday-build"],"_links":{"self":[{"href":"http:\/\/ckhollidayplans.com\/blog\/wp-json\/wp\/v2\/posts\/441","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/ckhollidayplans.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/ckhollidayplans.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/ckhollidayplans.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/ckhollidayplans.com\/blog\/wp-json\/wp\/v2\/comments?post=441"}],"version-history":[{"count":2,"href":"http:\/\/ckhollidayplans.com\/blog\/wp-json\/wp\/v2\/posts\/441\/revisions"}],"predecessor-version":[{"id":885,"href":"http:\/\/ckhollidayplans.com\/blog\/wp-json\/wp\/v2\/posts\/441\/revisions\/885"}],"wp:attachment":[{"href":"http:\/\/ckhollidayplans.com\/blog\/wp-json\/wp\/v2\/media?parent=441"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/ckhollidayplans.com\/blog\/wp-json\/wp\/v2\/categories?post=441"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/ckhollidayplans.com\/blog\/wp-json\/wp\/v2\/tags?post=441"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}