{"id":1584,"date":"2019-08-01T21:22:18","date_gmt":"2019-08-01T19:22:18","guid":{"rendered":"https:\/\/www.amgautomatyka.pl\/?p=1584"},"modified":"2025-01-08T11:06:45","modified_gmt":"2025-01-08T10:06:45","slug":"accuracy-and-repeatability-only-pay-for-what-you-need","status":"publish","type":"post","link":"https:\/\/www.amgautomatyka.pl\/en\/accuracy-and-repeatability-only-pay-for-what-you-need\/","title":{"rendered":"Accuracy and repeatability. Only pay for what you need."},"content":{"rendered":"<h2>What is accuracy?<\/h2>\n<p>Here\u2019s a straight-forward definition: accuracy is the ability of an actuator to achieve a specified position. All the arrows hit the bullseye.<\/p>\n<p>In real life manufacturing, many factors can influence accuracy. Factors like:<\/p>\n<p><strong>Degrees of freedom<\/strong><\/p>\n<p>A designer needs to know the application\u2019s requirements for accuracy on six axes since an electric actuator has the possibility for error in six degrees of freedom:<\/p>\n<ul>\n<li>X axis (back and forth)<\/li>\n<li>Y axis (side to side)<\/li>\n<li>Z axis (up and down)<\/li>\n<li>Rotation around each axis<\/li>\n<\/ul>\n<p><strong>System components <\/strong><\/p>\n<p>The design engineer will need to understand how the components of an electric linear actuator can affect accuracy. For example, machined housings are manufactured to tighter tolerances than extruded housings. Roller screws are more accurate than either ball or acme screws. Even motors can affect accuracy in electric linear motion systems.<\/p>\n<p><strong>Mounting and orientation<\/strong><\/p>\n<p>A machine designer may need to consider mounting and orientation since they can affect accuracy along selected axes. For example, anchoring an actuator to a known flat surface could eliminate errors due to bowing and twisting (distortion on the Y and Z axes).<\/p>\n<p>The bottom line is that accuracy can be expensive. Higher performance actuator components like machined housings and roller screws cost more. The designer will have to weigh all the application\u2019s needs to know if accuracy\u2019s what\u2019s needed or something else, like repeatability.<\/p>\n<h2>What is repeatability?<\/h2>\n<p>Simply put, repeatability is the ability of an actuator to achieve a given position time after time. Repeatability is the same as predictability, an important characteristic in an automation component. It may not be the bullseye, but you hit the same spot again and again.<\/p>\n<p><a href=\"https:\/\/www.amgautomatyka.pl\/wp-content\/uploads\/2019\/08\/0-8.webp\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1680 size-large\" src=\"https:\/\/www.amgautomatyka.pl\/wp-content\/uploads\/2019\/08\/0-8-737x1024.webp\" alt=\"\" width=\"737\" height=\"1024\" srcset=\"https:\/\/www.amgautomatyka.pl\/wp-content\/uploads\/2019\/08\/0-8-737x1024.webp 737w, https:\/\/www.amgautomatyka.pl\/wp-content\/uploads\/2019\/08\/0-8-216x300.webp 216w, https:\/\/www.amgautomatyka.pl\/wp-content\/uploads\/2019\/08\/0-8-768x1068.webp 768w, https:\/\/www.amgautomatyka.pl\/wp-content\/uploads\/2019\/08\/0-8.webp 1079w\" sizes=\"auto, (max-width: 737px) 100vw, 737px\" \/><\/a><\/p>\n<h2>Be a budget hero<\/h2>\n<p>Don\u2019t pay for more capability than your application calls for. If you take a close look, you may find that what you need is not accuracy so much as a high degree of repeatability or predictability. If you can control the actuator\u2019s accuracy through mounting and other means, you may be able to use a more economical model. That could lower overall system costs and make you a hero!<\/p>\n<p>Original version of an article comes from the Tolomatic blog:<br \/>\n<a href=\"https:\/\/www.tolomatic.com\/blog\/artmid\/843\/articleid\/301\/accuracy-and-repeatability-only-pay-for-what-you-need\" rel=\"nofollow\">https:\/\/www.tolomatic.com\/blog\/artmid\/843\/articleid\/301\/accuracy-and-repeatability-only-pay-for-what-you-need<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"What is accuracy? Here\u2019s a straight-forward definition: accuracy is the ability of an actuator to&#8230;","protected":false},"author":2,"featured_media":1649,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1584","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bez-kategorii"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Accuracy and repeatability. 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