{"id":1451,"date":"2026-09-08T13:58:00","date_gmt":"2026-09-08T18:58:00","guid":{"rendered":"http:\/\/blog.misumiusa.com\/?p=1451"},"modified":"2026-10-08T14:02:57","modified_gmt":"2026-10-08T19:02:57","slug":"locating-pin-alignment-concerns","status":"publish","type":"post","link":"https:\/\/blog.misumiusa.com\/locating-pin-alignment-concerns\/","title":{"rendered":"Locating Pin Alignment: How to Prevent Part Binding in Jigs and Fixtures (Video)"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Quick answer: <\/strong>Parts bind on <a href=\"https:\/\/us.misumi-ec.com\/vona2\/selector\/locating-pins\/\" target=\"_blank\" rel=\"noopener\" title=\"\">locating pins<\/a> when two pins constrain the same direction, so any variation in hole spacing has nowhere to go. The most common fix is to pair a round pin with a diamond (relieved) pin, with the diamond\u2019s flats set across the line between the pins. The pins then control position and rotation without fighting each other. Tapered or bullet-nose pin tips and chamfered holes make loading easier.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This episode covers the most common solutions to locating pin alignment problems in <a href=\"http:\/\/us.misumi-ec.com\/vona2\/mech\/M0300000000\/\" target=\"_blank\" rel=\"noreferrer noopener\">jigs and fixtures<\/a>. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What is part binding?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Binding happens when a workpiece sticks or jams as it is placed on, or removed from, a pair of locating pins. The part ends up cocked or out of alignment, so it can\u2019t seat or release cleanly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Why binding matters<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Slower cycle times as operators wiggle parts on and off<\/li>\n\n\n\n<li>Reject parts from improperly assembled or machined components<\/li>\n\n\n\n<li>Faster pin and hole wear<\/li>\n\n\n\n<li>Inconsistent, non-repeatable location<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Common causes<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Two full-diameter round pins:<\/strong> hole-to-hole spacing tolerance plus pin-to-pin spacing tolerance leaves no room to engage both pins.<\/li>\n\n\n\n<li><strong>Too little clearance<\/strong> between the pin and the part\u2019s hole.<\/li>\n\n\n\n<li><strong>No lead-in:<\/strong> blunt pin tips or sharp hole edges catch.<\/li>\n\n\n\n<li><strong>Angled loading or removal,<\/strong> where the part tilts instead of moving straight along the pin axis.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Solutions that reduce binding<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Use a round pin plus a diamond pin.<\/strong> The round pin fixes X and Y position. The diamond pin is relieved on two sides and is oriented so its flats face across the line connecting the pins, which stops rotation without over-constraining the part. This is the standard answer to two-pin binding.<\/li>\n\n\n\n<li><strong>Add lead-in.<\/strong> Tapered or bullet-nose tips help the part find the pin. Chamfered holes help too.<\/li>\n\n\n\n<li><strong>Set pin heights.<\/strong> Make one pin taller so the part engages one pin first and then the second.<\/li>\n\n\n\n<li><strong>Check the fit.<\/strong> Choose pin and hole tolerances so the part slides on freely but stays repeatable. Consult a standard fit table for your hole tolerance.<\/li>\n\n\n\n<li><strong>Use a slot instead of a second round hole,<\/strong> where the part design allows it.<\/li>\n\n\n\n<li><strong>Load and unload along the pin axis.<\/strong> Add guides or stops that encourage straight motion.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Watch: Locating Pins Pt. 4: Alignment Concerns<\/h2>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Locating Pins Pt. 4: Alignment Concerns | Engineer to Engineer | MISUMI USA\" width=\"720\" height=\"405\" src=\"https:\/\/www.youtube.com\/embed\/SvMj785_oio?feature=oembed&#038;enablejsapi=1&#038;origin=https:\/\/blog.misumiusa.com\" 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<h2 class=\"wp-block-heading\">FAQ<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What causes parts to bind on locating pins?<\/strong><br>Two round pins constrain the part in the same direction, so normal tolerance variation in hole spacing prevents both pins from engaging cleanly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What is a diamond pin?<\/strong><br>A locating pin relieved on two sides so it contacts the hole at only two points. It resists rotation about the round pin without adding a second position constraint.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How do I orient a diamond pin?<\/strong><br>Place its flats perpendicular to the line between the two pin centers, so the contact surfaces sit across that line.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Can I eliminate binding with looser fits alone?<\/strong><br>Looser clearance helps, but it reduces repeatability. A round-plus-diamond pair addresses the cause and keeps accuracy.<\/p>\n\n\n\n<style>\n  .mm-cta-block, .mm-cta-block * { box-sizing: border-box; }\n\n  .mm-cta-block { margin: 32px 0; }\n\n  .mm-cta-card {\n    border: 1px solid #e2e2e0;\n    border-top: 4px solid #FFD700;\n    border-radius: 6px;\n    padding: 24px 28px;\n    background: #fafaf8;\n  }\n  .mm-cta-card h3 {\n    margin: 0 0 8px;\n    display: inline-block;\n    border-bottom: 2px solid #FFD700;\n    padding-bottom: 4px;\n  }\n  .mm-cta-card p { margin: 12px 0 18px; }\n\n  .mm-btn {\n    display: inline-block;\n    padding: 12px 24px;\n    margin: 0 12px 8px 0;\n    border-radius: 4px;\n    font-weight: 700;\n    text-decoration: none;\n    border: 2px solid #FFD700;\n  }\n  .mm-btn-primary { background: #FFD700; color: #1a1a18; }\n  .mm-btn-primary:hover { background: #e6c200; border-color: #e6c200; color: #1a1a18; }\n  .mm-btn-outline { background: transparent; color: #1a1a18; }\n  .mm-btn-outline:hover { background: #FFD700; color: #1a1a18; }\n\n  .mm-related { margin-top: 32px; }\n  .mm-related h2 {\n    display: inline-block;\n    border-bottom: 2px solid #FFD700;\n    padding-bottom: 4px;\n    margin: 0 0 16px;\n  }\n  .mm-related-grid {\n    display: grid;\n    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));\n    gap: 16px;\n  }\n  .mm-related-card {\n    display: block;\n    border: 1px solid #e2e2e0;\n    border-left: 4px solid #FFD700;\n    border-radius: 4px;\n    padding: 14px 16px;\n    background: #fff;\n    text-decoration: none;\n    color: #1a1a18;\n  }\n  .mm-related-card:hover { background: #fffbe0; }\n  .mm-related-label {\n    display: inline-block;\n    background: #FFD700;\n    color: #1a1a18;\n    font-size: 0.75em;\n    font-weight: 700;\n    padding: 2px 8px;\n    border-radius: 3px;\n    margin-bottom: 6px;\n  }\n  .mm-related-card strong { display: block; }\n<\/style>\n\n<div class=\"mm-cta-block\">\n  <div class=\"mm-cta-card\">\n    <h3>Ready to Fix Part Binding in Your Fixture?<\/h3>\n    <p>\n      Choose from round, diamond (relieved), and tapered locating pins in a wide range of diameters, tolerances, and mounting styles, or explore the full range of jig and fixture components.\n    <\/p>\n    <a class=\"mm-btn mm-btn-primary\" href=\"https:\/\/us.misumi-ec.com\/vona2\/selector\/locating-pins\/\">Shop Locating Pins<\/a>\n    <a class=\"mm-btn mm-btn-outline\" href=\"https:\/\/us.misumi-ec.com\/vona2\/mech\/M0300000000\/\">Browse Jig &amp; Fixture Components<\/a>\n  <\/div>\n\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Quick answer: Parts bind on locating pins when two pins constrain the same direction, so any variation in hole spacing has nowhere to go. The most common fix is to pair a round pin with a diamond (relieved) pin, with the diamond\u2019s flats set across the line between the pins. The pins then control position and rotation without fighting each [&hellip;]<\/p>\n","protected":false},"author":46,"featured_media":1453,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"footnotes":""},"categories":[55],"tags":[295,54,239],"class_list":["post-1451","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-videos","tag-jigs-and-fixtures","tag-locating-pin","tag-locating-pins"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"Parts binding on locating pins? 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