{"id":616,"date":"2013-05-22T15:38:27","date_gmt":"2013-05-22T19:38:27","guid":{"rendered":"http:\/\/projecthexapod.com\/blog\/?p=616"},"modified":"2013-05-22T15:41:02","modified_gmt":"2013-05-22T19:41:02","slug":"update-5212013","status":"publish","type":"post","link":"http:\/\/projecthexapod.com\/blog\/2013\/05\/update-5212013\/","title":{"rendered":"Update 5\/21\/2013"},"content":{"rendered":"<p>Hello Internet!<\/p>\n<p>It&#8217;s happened again&#8230; we have failed to keep posting updates in a timely manner. Many apologies. I&#8217;ll try to catch us up a bit:<\/p>\n<p>On the control side, there was a huge amount of progress in April.  The system is a huge challenge to control.  Keep in mind that in the testing below, we are moving at roughly the maximum speed allowed by our electric lab pumps.  When running off the real HPU, the leg can move about twice the speed.<\/p>\n<p><iframe loading=\"lazy\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/wlgbhxKZ6SA?feature=player_detailpage\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n<p>On the mechanical front, final leg design and FEA is in progress. Many of the shortcomings of the prototype leg are being addressed, including:<br \/>\n<!--more--><br \/>\nThe Protoleg has bushing alignment issues.\u00a0 We got around this through a tedious and sketchy hand-reaming process on every joint axis on Protoleg.\u00a0 The process accounted for a significant portion of the time necessary to assemble the leg.\u00a0 In the revised leg design, the joint bushings will be mounted inside spherical bearings to soak up misalignment.\u00a0 This will make for much more even wear of the bushings and hopefully a longer-lived robot.<\/p>\n<p>%%wppa%%<br \/>\n%%slide=10%%<\/p>\n<p>Also changing in the legs is the means of attachment to the piston.\u00a0 On Protoleg,the piston attachment pin spans the entire width of the leg.\u00a0 On the revised design, tabs have been added to allow for a much shorter pin.\u00a0 Shorter pins means easier alignment during assembly and less pin flex during operation.<\/p>\n<p>The revised leg design is also about 20% wider than Protoleg.  This increases the strength of the leg significantly for the same amount of weight.  The new leg design is undergoing FEA and detail design right now, but here are some preliminary renderings of the new yaw and thigh members.<\/p>\n<p>%%wppa%%<br \/>\n%%slide=11%%<\/p>\n<p>All of our electronics for the entire robot are also in fabrication right now.  The designs on the Protoleg have performed admirably and the simple potting-and-hardwire system has proven very robust.<\/p>\n<p>%%wppa%%<br \/>\n%%slide=12%%<\/p>\n<p>We&#8217;re pushing forward on all fronts.  It&#8217;s taken much more time than we anticipated to get all the designs finalized, but we are almost ready to begin construction in earnest.  More detailed reviews of all designs will be posted as they are finalized, but hopefully this post provides a good overview of things we&#8217;ve been working on.<\/p>\n<p>Thanks!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hello Internet! It&#8217;s happened again&#8230; we have failed to keep posting updates in a timely manner. Many apologies. I&#8217;ll try to catch us up a bit: On the control side, there was a huge amount of progress in April. The system is a huge challenge to control. Keep in mind that in the testing below, &hellip; <a href=\"http:\/\/projecthexapod.com\/blog\/2013\/05\/update-5212013\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Update 5\/21\/2013<\/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":[1],"tags":[],"class_list":["post-616","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"http:\/\/projecthexapod.com\/blog\/wp-json\/wp\/v2\/posts\/616","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/projecthexapod.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/projecthexapod.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/projecthexapod.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/projecthexapod.com\/blog\/wp-json\/wp\/v2\/comments?post=616"}],"version-history":[{"count":10,"href":"http:\/\/projecthexapod.com\/blog\/wp-json\/wp\/v2\/posts\/616\/revisions"}],"predecessor-version":[{"id":630,"href":"http:\/\/projecthexapod.com\/blog\/wp-json\/wp\/v2\/posts\/616\/revisions\/630"}],"wp:attachment":[{"href":"http:\/\/projecthexapod.com\/blog\/wp-json\/wp\/v2\/media?parent=616"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/projecthexapod.com\/blog\/wp-json\/wp\/v2\/categories?post=616"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/projecthexapod.com\/blog\/wp-json\/wp\/v2\/tags?post=616"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}