{"id":1012,"date":"2017-09-12T19:10:34","date_gmt":"2017-09-13T02:10:34","guid":{"rendered":""},"modified":"2025-12-01T07:34:31","modified_gmt":"2025-12-01T15:34:31","slug":"1012","status":"publish","type":"post","link":"https:\/\/www.vernier.com\/til\/1012","title":{"rendered":"What are the dimensions of the 3-step pulley\/wheel on the Rotary Motion Sensor?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">The dimensions and masses of the <a href=\"https:\/\/www.vernier.com\/product\/rotary-motion-sensor-replacement-pulley\/\">Rotary Motion Sensor 3-step Pulley\/Wheel<\/a> are the same for the Standard Rotary Motion Sensor and the Go Direct Rotary Motion Sensor. The measurements are as follows:<\/p>\n<p class=\"wp-block-paragraph\">Diameter of small groove: 10 mm<br \/>Diameter of medium groove: 29 mm<br \/>Diameter of large groove: 48 mm<br \/>Diameter of outer: 52 mm<br \/>Diameter of outer with rubber O-ring installed: 55 mm<\/p>\n<p class=\"wp-block-paragraph\">Moment of Inertia for 3-step pulley: approx. 2.7 X 10^-6 kg m^2. The mass is 8.6 g.<br \/>Moment of Inertia for shaft and encoder: approx. 1.1 X 10^-6 kg m^2. The mass is 18.8 g.<\/p>\n<p class=\"wp-block-paragraph\">See also:<br \/><a href=\"\/til\/2732\/\">What are the moments of inertia of the disks included in the Rotary Motion Accessory Kit?<\/a><br \/><a href=\"\/til\/4051\/\">Go Direct Rotary Motion Troubleshooting and FAQs<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>The dimensions and masses of the Rotary Motion Sensor 3-step Pulley\/Wheel are the same for the Standard Rotary Motion Sensor and the Go Direct Rotary&#8230;<\/p>\n","protected":false},"author":86433,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[94,842,631,841,412,413,199,839,411,52,840],"class_list":["post-1012","post","type-post","status-publish","format-standard","hentry","tag-ci-6625","tag-diameter","tag-gdx-rms","tag-how-big","tag-rms","tag-rms-btd","tag-rms-uli","tag-rmv","tag-rmv-btd","tag-rotary","tag-size"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/1012","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/users\/86433"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/comments?post=1012"}],"version-history":[{"count":0,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/1012\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/media?parent=1012"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/categories?post=1012"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/tags?post=1012"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}