{"id":4273,"date":"2020-10-12T18:43:53","date_gmt":"2020-10-12T17:43:53","guid":{"rendered":"http:\/\/dronesonen.usn.no\/?p=4273"},"modified":"2020-12-09T23:44:45","modified_gmt":"2020-12-09T22:44:45","slug":"week-41-2","status":"publish","type":"post","link":"https:\/\/dronesonen.usn.no\/?p=4273","title":{"rendered":"Week 41"},"content":{"rendered":"\n<p><strong><em>Table of contents<\/em><\/strong>:<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>The mechanics of springs and using them for propulsion(Daniel)<\/li><li>Stepper Motor programming for spring loading (David)<\/li><li>Simple servo program for writing degrees of rotation (David)<\/li><\/ol>\n\n\n\n<p class=\"has-large-font-size\">#1 <strong>The Mechanics of Springs<\/strong>, <strong>pulleys and propulsion<\/strong><\/p>\n\n\n\n<p>As it is now decided that we are going to use springs for our propulsion, I belive that some elaboration is in need. <br>The plan is to use a pully system, made up of 3d printed parts to pull back 4 compression springs(specifically<strong> 65mm x 6.8mm, 0.11N\/mm<\/strong>), to then release the built up force to propel the projectile in the barrel. <br>The force you get out of a spring is calculated by the formula for stored potential energy in springs :<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignleft is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/useruploads.socratic.org\/BDdx3oLBRcinM95cLQLj_spring%20pot%20energy.gif\" alt=\"A ball with a mass of 350 g is projected vertically by a spring loaded  contraption. The spring in the contraption has a spring constant of 16  (kg)\/s^2 and was compressed by\" width=\"304\" height=\"121\" \/><\/figure><\/div>\n\n\n\n<p>As we have 4 springs the only change is that the K factor will be multiplied by 4.<br><br><br><br><br><br>I am working on developing a pulley system for the spring tensioning. <br>For those of you who do not know, a pulley is a system that reduces force needed by redirecting the work into multiple axis of load.<br>There are many different types of pulleys, which all disperses the load in different ways. <br>The most prominent systems are; <em>fixed pulley, movable pulley <\/em> and <em> block and tackle.<\/em><\/p>\n\n\n\n<p> Destin Sandlin from &#8220;<strong><em>smarter every day<\/em><\/strong>&#8221; of Youtube has a beautiful video on how the work. I found a new appreciation for applied physics with this video, you can watch it down below if you to are extra curious.<\/p>\n\n\n\n<figure class=\"wp-block-embed-youtube wp-block-embed is-type-video is-provider-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Why Snatch Blocks are AWESOME (How Pulleys Work)  - Smarter Every Day 228\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/M2w3NZzPwOM?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">#2 <strong>Stepper motor for spring loading<\/strong><\/h2>\n\n\n\n<p>We figured a way of loading the spring would\nbe to use stepper motors. The advantage of a stepper motor is that we have some\noptions in terms of how many \u201csteps\u201d we can set. The main objectives of its\nfunction are; <\/p>\n\n\n\n<p>-Load the spring from top to desired firing\nstrength. <\/p>\n\n\n\n<p>-If the stepper motor arrives at the last\nspot on the spring loading step, it should stop and initiate a reset after\nfiring.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"514\" height=\"525\" src=\"http:\/\/dronesonen.usn.no\/wp-content\/uploads\/2020\/10\/image-25.png\" alt=\"\" class=\"wp-image-4321\" srcset=\"https:\/\/dronesonen.usn.no\/wp-content\/uploads\/2020\/10\/image-25.png 514w, https:\/\/dronesonen.usn.no\/wp-content\/uploads\/2020\/10\/image-25-294x300.png 294w\" sizes=\"auto, (max-width: 514px) 100vw, 514px\" \/><figcaption>The Arduino program  to initiate the stepper motor spring loading (work in progress)<\/figcaption><\/figure>\n\n\n\n<p>What remains to be done is a reset mechanism, which is harder than it might appear. There needs to be some communication between the firing mechanism and the reset mechanism. To reset the spring loading prematurely ruins the firing mechanism. So, while work is being done there the program will have to wait. <br><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><br>#3  Servo motor for turning in x-axis:<br><\/h2>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"396\" height=\"358\" src=\"http:\/\/dronesonen.usn.no\/wp-content\/uploads\/2020\/10\/image-26.png\" alt=\"\" class=\"wp-image-4322\" srcset=\"https:\/\/dronesonen.usn.no\/wp-content\/uploads\/2020\/10\/image-26.png 396w, https:\/\/dronesonen.usn.no\/wp-content\/uploads\/2020\/10\/image-26-300x271.png 300w\" sizes=\"auto, (max-width: 396px) 100vw, 396px\" \/><figcaption>Simple program to determine what angel the servo motor should turn in one axis<\/figcaption><\/figure>\n\n\n\n<p><br><br><br><br><br><br><br><br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Table of contents: The mechanics of springs and using them for propulsion(Daniel) Stepper Motor programming for spring loading (David) Simple servo program for writing degrees of rotation (David) #1 The Mechanics of Springs, pulleys and propulsion As it is now decided that we are going to use springs for our propulsion, I belive that some [&hellip;]<\/p>\n","protected":false},"author":74,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[62],"tags":[82,77,70,76,78],"class_list":["post-4273","post","type-post","status-publish","format-standard","hentry","category-smartsystems2020","tag-fenrir","tag-pulley","tag-servo","tag-springs","tag-stepper-motor"],"_links":{"self":[{"href":"https:\/\/dronesonen.usn.no\/index.php?rest_route=\/wp\/v2\/posts\/4273","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dronesonen.usn.no\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dronesonen.usn.no\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dronesonen.usn.no\/index.php?rest_route=\/wp\/v2\/users\/74"}],"replies":[{"embeddable":true,"href":"https:\/\/dronesonen.usn.no\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4273"}],"version-history":[{"count":1,"href":"https:\/\/dronesonen.usn.no\/index.php?rest_route=\/wp\/v2\/posts\/4273\/revisions"}],"predecessor-version":[{"id":4334,"href":"https:\/\/dronesonen.usn.no\/index.php?rest_route=\/wp\/v2\/posts\/4273\/revisions\/4334"}],"wp:attachment":[{"href":"https:\/\/dronesonen.usn.no\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4273"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dronesonen.usn.no\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4273"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dronesonen.usn.no\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4273"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}