{"id":62599,"date":"2026-06-23T10:31:14","date_gmt":"2026-06-23T08:31:14","guid":{"rendered":"https:\/\/spreitzer.de\/techblog\/run-out-testing-basics\/"},"modified":"2026-06-23T10:31:14","modified_gmt":"2026-06-23T08:31:14","slug":"run-out-testing-basics","status":"publish","type":"wt_fachwissen","link":"https:\/\/spreitzer.de\/en\/techblog\/run-out-testing-basics\/","title":{"rendered":"Run-out testing: fundamentals, measured variables, and methods"},"content":{"rendered":"<div class=\"fw-tldr\" style=\"border-left:4px solid #c8102e;background:#f6f6f6;padding:16px 20px;margin:0 0 28px;border-radius:4px\"><strong>In brief:<\/strong><\/p>\n<ul>\n<li>Radial run-out = radial deviation of a rotating surface relative to the <strong>datum axis<\/strong>.<\/li>\n<li>Measured with a dial indicator\/dial comparator \u2014 between centers or in a V-block.<\/li>\n<li>Critical for shafts, tools, and spindles.<\/li>\n<\/ul>\n<\/div>\n<h2>What is radial run-out accuracy?<\/h2>\n<p>Radial run-out indicates how much a rotating surface deviates radially from the datum axis during one revolution. The smaller the deviation, the more smoothly and precisely the component runs.<\/p>\n<h2>Radial run-out vs. axial run-out<\/h2>\n<p><strong>Radial run-out<\/strong> refers to the radial deviation perpendicular to the axis, while <strong>axial run-out<\/strong> refers to the axial deviation of an end face along the axis. Both are important parameters of rotating parts.<\/p>\n<h2>How is radial run-out measured?<\/h2>\n<p>The workpiece is held in a defined position \u2014 often between centers or in a V-block \u2014 and rotated about the datum axis. A dial indicator or dial comparator scans the surface; the difference between the highest and lowest reading is the radial run-out.<\/p>\n<h2>What should you look for in the evaluation?<\/h2>\n<p>What matters is a clean datum reference, the correct tolerance specification, and reproducible measuring conditions. Only a defined datum makes measured values comparable.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Run-out testing in plain terms: what radial run-out accuracy means, how it differs from axial run-out, and which methods are used to measure it.<\/p>\n","protected":false},"author":14,"featured_media":42941,"template":"","meta":[],"wt_wissensthema":[377],"class_list":["post-62599","wt_fachwissen","type-wt_fachwissen","status-publish","has-post-thumbnail","hentry","wt_wissensthema-metrology"],"_links":{"self":[{"href":"https:\/\/spreitzer.de\/en\/wp-json\/wp\/v2\/wt_fachwissen\/62599","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/spreitzer.de\/en\/wp-json\/wp\/v2\/wt_fachwissen"}],"about":[{"href":"https:\/\/spreitzer.de\/en\/wp-json\/wp\/v2\/types\/wt_fachwissen"}],"author":[{"embeddable":true,"href":"https:\/\/spreitzer.de\/en\/wp-json\/wp\/v2\/users\/14"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/spreitzer.de\/en\/wp-json\/wp\/v2\/media\/42941"}],"wp:attachment":[{"href":"https:\/\/spreitzer.de\/en\/wp-json\/wp\/v2\/media?parent=62599"}],"wp:term":[{"taxonomy":"wt_wissensthema","embeddable":true,"href":"https:\/\/spreitzer.de\/en\/wp-json\/wp\/v2\/wt_wissensthema?post=62599"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}