{"id":38435,"date":"2012-07-30T04:08:25","date_gmt":"2012-07-30T11:08:25","guid":{"rendered":"http:\/\/www.ponoko.com\/blog\/?p=38435"},"modified":"2018-03-11T21:07:36","modified_gmt":"2018-03-12T04:07:36","slug":"variable-speed-bike-sprocket","status":"publish","type":"post","link":"https:\/\/www.ponoko.com\/blog\/ponoko\/variable-speed-bike-sprocket\/","title":{"rendered":"Variable speed bike sprocket"},"content":{"rendered":"<p><strong>Give your single speed bike a boost with some parametric goodness<\/strong><br \/>\n<a href=\"http:\/\/www.ponoko.com\/blog\/2012\/07\/30\/variable-speed-bike-sprocket\/\" target=\"_blank\"><img decoding=\"async\" class=\"alignnone size-large wp-image-38448\" title=\"variablegear\" src=\"http:\/\/www.ponoko.com\/blog\/wp-content\/uploads\/2012\/07\/variablegear1-1024x562.jpg\" alt=\"\" width=\"100%\" \/><\/a><\/p>\n<p>If there was an award for parametric design that made riding your single speed or fixie bike usable on gradients greater than 5 degrees for people other than Olympic athletes, then Jason DeRose would surely take it out with his variable ratio mechanical gear design.<\/p>\n<p>DeRose, a software developer used Python and employed mathematics and geometry to work out the position of the sprocket teeth to craft his design. As part of DeRose\u2019s design process, he then extruded the linework into 3D in Blender. He has also released the project files as <a href=\"https:\/\/launchpad.net\/sprocket\" target=\"_blank\" rel=\"nofollow\">open source on launchpad to allow others to build upon it<\/a>. <!--more--><\/p>\n<p><a href=\"http:\/\/www.ponoko.com\/blog\/wp-content\/uploads\/2012\/07\/varigear.jpg\" target=\"_blank\"><img decoding=\"async\" src=\"http:\/\/www.ponoko.com\/blog\/wp-content\/uploads\/2012\/07\/varigear.jpg\" alt=\"\" title=\"varigear\" width=\"100%\" class=\"alignnone size-full wp-image-38450\" srcset=\"https:\/\/www.ponoko.com\/blog\/wp-content\/uploads\/2012\/07\/varigear.jpg 679w, https:\/\/www.ponoko.com\/blog\/wp-content\/uploads\/2012\/07\/varigear-229x300.jpg 229w\" sizes=\"(max-width: 679px) 100vw, 679px\" \/><\/a><\/p>\n<p>DeRose notes in his project rational, several advantages in efficiency, that his concept has over the common bicycle derailleur system:<\/p>\n<blockquote><p>\u201c&#8230;in most [derailleur] sprocket combinations, the input and output sprockets are not coplanar. In these cases, some of the rider&#8217;s input torque is wasted as lateral forces upon the frame, doing no useful work in terms of propulsion. Second, the output side (rear) derailleur involves the use of two pulleys to properly position the chain relative to the selected output sprocket and to absorb any excess chain length created by the particular sprocket combination. These pulleys double the total chain articulation (from 360\u00b0 to 720\u00b0), introducing additional frictional losses. This increased chain length adds additional mass, disadvantageous on its own. This additional chain mass increases the effective combined moment of inertia of the rotating masses\u2026\u201d<\/p><\/blockquote>\n<p><iframe loading=\"lazy\" title=\"Variable Tooth Sprocket\" width=\"640\" height=\"480\" src=\"https:\/\/www.youtube.com\/embed\/wAi9WwvkkPQ?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><\/p>\n<p>The concept seems pretty sound and similar in principle to other variable gear mechanisms that I\u2019ve seen. Perhaps, <a href=\"http:\/\/www.ponoko.com\/3d-printing\" target=\"_blank\">3D printing a prototype<\/a> would be a good methodology to test out the design? Although, with such a mechanism fixed to your ride, it could no longer be technically deemed a single speed, I doubt that anyone would notice as you effortlessly fly  pass the exhausted and out of breath hipsters.<\/p>\n<p>Via <a href=\"http:\/\/www.blendernation.com\/2012\/07\/21\/an-open-source-variable-tooth-bike-sprocket\/#utm_source=feedburner&amp;utm_medium=feed&amp;utm_campaign=Feed%3A+Blendernation+%28BlenderNation%29\" target=\"_blank\" rel=\"nofollow\">Blender Nation<\/a><\/p>\n<hr size=\"2\" \/>David is an industrial designer from New Zealand. He contributes a weekly article on personal fabrication for Ponoko. Follow him on <a href=\"http:\/\/www.twitter.com\/@dizymac\" target=\"_blank\" rel=\"nofollow\">Twitter!<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p><strong>Give your single speed bike a boost with some parametric goodness<\/strong>\n<\/p>\n<p>If there was an award for parametric design that made riding your single speed or fixie bike usable on gradients greater than 5 degrees for people other than Olympic athletes, then Jason DeRose would surely take it out with his variable ratio mechanical gear design.<\/p>\n<p>DeRose, a software developer used Python and employed mathematics and geometry to work out the position of the sprocket teeth to craft his design.<\/p>\n","protected":false},"author":43,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1965,2],"tags":[],"class_list":["post-38435","post","type-post","status-publish","format-standard","hentry","category-digital-manufacturing","category-ponoko"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Variable speed bike sprocket<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ponoko.com\/blog\/ponoko\/variable-speed-bike-sprocket\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Variable speed bike sprocket\" \/>\n<meta property=\"og:description\" content=\"Give your single speed bike a boost with some parametric goodness If there was an award for parametric design that made riding your single speed or fixie bike usable on gradients greater than 5 degrees for people other than Olympic athletes, then Jason DeRose would surely take it out with his variable ratio mechanical gear design. DeRose, a software developer used Python and employed mathematics and geometry to work out the position of the sprocket teeth to craft his design.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ponoko.com\/blog\/ponoko\/variable-speed-bike-sprocket\/\" \/>\n<meta property=\"og:site_name\" content=\"Ponoko\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/pages\/Ponoko\/34020780272\" \/>\n<meta property=\"article:published_time\" content=\"2012-07-30T11:08:25+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2018-03-12T04:07:36+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/www.ponoko.com\/blog\/wp-content\/uploads\/2012\/07\/variablegear1-1024x562.jpg\" \/>\n<meta name=\"author\" content=\"David McGahan\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@Ponoko\" \/>\n<meta name=\"twitter:site\" content=\"@Ponoko\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.ponoko.com\/blog\/ponoko\/variable-speed-bike-sprocket\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.ponoko.com\/blog\/ponoko\/variable-speed-bike-sprocket\/\"},\"author\":{\"name\":\"David McGahan\",\"@id\":\"https:\/\/www.ponoko.com\/blog\/#\/schema\/person\/c2224df6cf9c72193c0cee122f046e9c\"},\"headline\":\"Variable speed bike sprocket\",\"datePublished\":\"2012-07-30T11:08:25+00:00\",\"dateModified\":\"2018-03-12T04:07:36+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.ponoko.com\/blog\/ponoko\/variable-speed-bike-sprocket\/\"},\"wordCount\":359,\"image\":{\"@id\":\"https:\/\/www.ponoko.com\/blog\/ponoko\/variable-speed-bike-sprocket\/#primaryimage\"},\"thumbnailUrl\":\"http:\/\/www.ponoko.com\/blog\/wp-content\/uploads\/2012\/07\/variablegear1-1024x562.jpg\",\"articleSection\":[\"Digital Manufacturing\",\"Ponoko News\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.ponoko.com\/blog\/ponoko\/variable-speed-bike-sprocket\/\",\"url\":\"https:\/\/www.ponoko.com\/blog\/ponoko\/variable-speed-bike-sprocket\/\",\"name\":\"Variable speed bike sprocket\",\"isPartOf\":{\"@id\":\"https:\/\/www.ponoko.com\/blog\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.ponoko.com\/blog\/ponoko\/variable-speed-bike-sprocket\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.ponoko.com\/blog\/ponoko\/variable-speed-bike-sprocket\/#primaryimage\"},\"thumbnailUrl\":\"http:\/\/www.ponoko.com\/blog\/wp-content\/uploads\/2012\/07\/variablegear1-1024x562.jpg\",\"datePublished\":\"2012-07-30T11:08:25+00:00\",\"dateModified\":\"2018-03-12T04:07:36+00:00\",\"author\":{\"@id\":\"https:\/\/www.ponoko.com\/blog\/#\/schema\/person\/c2224df6cf9c72193c0cee122f046e9c\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.ponoko.com\/blog\/ponoko\/variable-speed-bike-sprocket\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.ponoko.com\/blog\/ponoko\/variable-speed-bike-sprocket\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.ponoko.com\/blog\/ponoko\/variable-speed-bike-sprocket\/#primaryimage\",\"url\":\"http:\/\/www.ponoko.com\/blog\/wp-content\/uploads\/2012\/07\/variablegear1-1024x562.jpg\",\"contentUrl\":\"http:\/\/www.ponoko.com\/blog\/wp-content\/uploads\/2012\/07\/variablegear1-1024x562.jpg\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.ponoko.com\/blog\/ponoko\/variable-speed-bike-sprocket\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.ponoko.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Variable speed bike sprocket\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.ponoko.com\/blog\/#website\",\"url\":\"https:\/\/www.ponoko.com\/blog\/\",\"name\":\"Ponoko\",\"description\":\"Laser Cutting &amp; Engraving News For Startup Engineers\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.ponoko.com\/blog\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.ponoko.com\/blog\/#\/schema\/person\/c2224df6cf9c72193c0cee122f046e9c\",\"name\":\"David McGahan\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.ponoko.com\/blog\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/c5a55dd999b1b43b702db85163c0a130799d9d95e019df787cfa196285e92a46?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/c5a55dd999b1b43b702db85163c0a130799d9d95e019df787cfa196285e92a46?s=96&d=mm&r=g\",\"caption\":\"David McGahan\"},\"description\":\"David is an industrial designer from Wellington, New Zealand. 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