{"id":81389,"date":"2025-11-24T06:02:00","date_gmt":"2025-11-24T14:02:00","guid":{"rendered":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/?p=81389"},"modified":"2025-11-11T12:13:44","modified_gmt":"2025-11-11T20:13:44","slug":"how-to-use-planar-joints-with-tangent-constraints-in-fusion","status":"publish","type":"post","link":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/how-to-use-planar-joints-with-tangent-constraints-in-fusion\/","title":{"rendered":"How to Use Planar Joints with Tangent Constraints in Fusion"},"content":{"rendered":"\n<p><em>Phil Eichmiller, Fusion QA Engineer explains how to use planar joints with tangent constraints in Fusion to create smooth, realistic assembly motion.<\/em><\/p>\n\n\n\n<?php\nfunction autodesk_fusion_cta_horizontal() {\n    ob_start();\n    ?>\n    <style>\n        .cta-section-horizontal {\n            background: #ddd; \/* Much lighter grey background *\/\n            padding: 12px; \/* Adjusted padding *\/\n            border-radius: 8px;\n            box-shadow: 0 3px 5px rgba(0, 0, 0, 0.2);\n            color: #333; \/* Darker text color for better readability *\/\n            display: flex;\n            align-items: center;\n            justify-content: space-between;\n            max-width: 650px; \/* Width adjusted for a more compact look *\/\n            margin: 20px auto;\n            position: relative;\n            flex-wrap: nowrap; \/* Prevent wrapping *\/\n        }\n\n        .cta-section-horizontal img {\n            width: 60px; \/* Slightly larger logo *\/\n            height: auto; \/* Maintain aspect ratio *\/\n            margin-right: 12px; \/* Adjusted spacing *\/\n            background-color: #ddd; \/* Match the background color *\/\n            padding: 6px; \/* Adjusted padding *\/\n            border-radius: 8px; \/* Slightly rounding to match container *\/\n            box-shadow: 0 0 0 4px #ddd; \/* Blend with background *\/\n        }\n\n        .cta-text {\n            flex: 1;\n            margin-right: 12px; \/* Adjusted spacing *\/\n        }\n\n        .cta-title {\n            font-size: 18px; \/* Slightly larger title font size *\/\n            font-weight: bold; \/* Bold title *\/\n            color: #f9a825; \/* Orange color *\/\n            margin-bottom: 4px; \/* Reduced margin *\/\n        }\n\n        .cta-info {\n            display: none; \/* Hide description *\/\n        }\n\n        .cta-buttons {\n            display: flex;\n            gap: 8px; \/* Adjusted button spacing *\/\n            align-items: center;\n        }\n\n        .cta-button {\n            padding: 8px 12px; \/* Button padding *\/\n            font-size: 12px; \/* Smaller font size for buttons *\/\n            font-weight: bold;\n            text-transform: uppercase;\n            border-radius: 4px; \/* Slightly rounded corners *\/\n            border: 2px solid transparent;\n            cursor: pointer;\n            transition: all 0.3s ease;\n            display: inline-flex; \/* Use inline-flex to ensure proper alignment *\/\n            align-items: center; \/* Center align text vertically *\/\n            justify-content: center; \/* Center align text horizontally *\/\n            text-decoration: none !important; \/* Ensure no underlines with !important *\/\n            color: inherit; \/* Use the button's text color *\/\n        }\n\n        .cta-button.white-button {\n            background-color: #fff;\n            color: #333;\n            border: 2px solid #ddd;\n        }\n\n        .cta-button.white-button:hover {\n            background-color: #333;\n            color: #fff;\n            border: 2px solid #f9a825;\n        }\n\n        .cta-button.black-button {\n            background-color: #f9a825;\n            color: #fff;\n            border: 2px solid #f9a825;\n        }\n\n        .cta-button.black-button:hover {\n            background-color: #fff;\n            color: #f9a825;\n            border: 2px solid #fff;\n        }\n    <\/style>\n\n    <div class=\"cta-section-horizontal\">\n        <img decoding=\"async\" src=\"https:\/\/autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/2024\/09\/autodesk-fusion-product-icon-400.png\" alt=\"Autodesk Fusion Logo\">\n        <div class=\"cta-text\">\n            <h1 class=\"cta-title\">Elevate your design and manufacturing processes with Autodesk Fusion<\/h1>\n        <\/div>\n        <div class=\"cta-buttons\">\n            <a href=\"https:\/\/www.autodesk.com\/products\/fusion-360\/trial-intake-flow\" class=\"cta-button white-button\">Get a 30-Day Free Trial<\/a>\n            <a href=\"https:\/\/www.autodesk.com\/products\/fusion-360\/extensions\" class=\"cta-button black-button\">See Plans and Pricing<\/a>\n        <\/div>\n    <\/div>\n\n    <?php\n    return ob_get_clean();\n}\nadd_shortcode('autodesk_fusion_cta_horizontal', 'autodesk_fusion_cta_horizontal');\n?>\n\n\n\n<p>If you\u2019ve ever struggled to get parts in your Fusion assemblies to move the way you expect, you\u2019re not alone. Constraining components for realistic motion can feel tricky, especially when sliding or rolling mechanics are involved. In this tutorial, I\u2019ll walk you through how to use planar joints and tangent constraints to unlock smooth, accurate movement in your designs.<\/p>\n\n\n<?xml encoding=\"utf-8\" ?><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=\"How to Use a Planar Joint with Tangent Constraint | Unstuck my Fusion Design\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/aWvH6vTk6tw?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen style=\"aspect-ratio:500 \/ 281;width:100%;height:auto;\"><\/iframe>\n<\/div><\/figure>\n\n\n<h2 class=\"wp-block-heading\" id=\"why-planar-joints-with-tangent-constraints-matter\">Why planar joints with tangent constraints matter<\/h2>\n\n\n<p>When building <a href=\"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/autodesk-fusion-360-basics-assemblies\/\">assemblies<\/a> \u2014whether it\u2019s robotics, <a href=\"https:\/\/www.autodesk.com\/solutions\/design-manufacturing\/consumer-products\/woodworking-furniture-design-software\">furniture<\/a>, or mechanical systems\u2014you want parts to behave realistically. A sliding rail should slide, a roller should roll, and bearings should stay aligned. Without the right constraints, your model can drift, rotate incorrectly, or simply refuse to move.<\/p>\n\n\n\n<p>That\u2019s where planar joints and tangent constraints come in. Together, they give you precise control over how parts interact, without requiring \u201cmanufacturing perfect\u201d geometry.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"step-1-ground-the-right-components\">Step 1: Ground the right components<\/h3>\n\n\n<p>Before adding joints, it\u2019s crucial to ground the part that should stay fixed. Grounding it prevents unwanted movement.<\/p>\n\n\n\n<p>At the same time, you\u2019ll want to unground the sliding part so it can move freely. Think of grounding as anchoring your assembly to reality.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"step-2-apply-a-planar-joint\">Step 2: Apply a planar joint<\/h3>\n\n\n<p>Next, add a planar <a href=\"https:\/\/help.autodesk.com\/view\/fusion360\/ENU\/?guid=GUID-8818AE31-958A-4A59-989B-9875A174C67A\">joint<\/a> between the sliding rail and the surface it moves along. This allows the part to move freely in two directions along the plane, while staying locked to it.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Select the faces you want to connect.<\/li>\n\n\n\n<li>Apply the planar joint.<\/li>\n\n\n\n<li>Test the movement. It should hould now slide smoothly along the surface.<\/li>\n<\/ul>\n\n\n\n<p>This step ensures your part doesn\u2019t float off into space or rotate unexpectedly.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"step-3-add-a-tangent-constraint\">Step 3: Add a tangent constraint<\/h3>\n\n\n<p>Now comes the magic. To keep the bearings aligned as the rail slides<strong>, <\/strong>add a <a href=\"https:\/\/help.autodesk.com\/view\/fusion360\/ENU\/?guid=SKT-CONSTRAIN-TANGENT\">tangent constraint<\/a>. Tangent is especially powerful for round surfaces or \u201croller on track\u201d mechanics.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Select the bearing surface and the rail track.<\/li>\n\n\n\n<li>Apply the tangent constraint.<\/li>\n\n\n\n<li>Watch as the bearings stay perfectly aligned while the rail moves.<\/li>\n<\/ul>\n\n\n\n<p>This combination of planar + tangent gives you realistic sliding motion with proper alignment.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"step-4-explore-motion-links-optional\">Step 4: Explore motion links (Optional)<\/h3>\n\n\n<p>Once your assembly is behaving correctly, you can take it further with <a href=\"https:\/\/www.autodesk.com\/learn\/ondemand\/course\/fusion360-cad-mechanical-design-cert-prep\/unit\/6QWr4waLtAlBS8iLcLXVxG\">motion links<\/a>. These let you synchronize movements\u2014like gears turning together or linked arms moving in unison. It\u2019s a great way to simulate more complex mechanisms and test your design before building.<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"key-takeaways-planar-joints-with-tangent-constraints\">Key takeaways: Planar joints with tangent constraints<\/h2>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Ground fixed parts<\/strong>: Anchor components that shouldn\u2019t move.<\/li>\n\n\n\n<li><strong>Unground moving parts<\/strong>: Free up the components that need motion.<\/li>\n\n\n\n<li><strong>Use planar joints<\/strong>: Allow sliding along a surface.<\/li>\n\n\n\n<li><strong>Add tangent constraints<\/strong>: Keep rollers, bearings, or round surfaces aligned.<\/li>\n\n\n\n<li><strong>Experiment with motion links<\/strong>: Synchronize movements for realistic simulations.<\/li>\n<\/ul>\n\n\n\n<p>Fusion gives you multiple ways to achieve realistic motion, and there\u2019s often more than one \u201cright\u201d approach. Planar joints and tangent constraints are two of the most versatile tools in your assembly toolbox. Once you get comfortable with them, you\u2019ll find your designs behave more like the real world &#8211; and you\u2019ll spend less time troubleshooting.<\/p>\n\n\n\n<p>So next time your assembly feels \u201cunstuck,\u201d try this workflow. It might just be the key to unlocking smooth, accurate motion in your project.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Phil Eichmiller, Fusion QA Engineer explains how to use planar joints with tangent constraints in Fusion to create smooth, realistic assembly motion. If you\u2019ve ever struggled to get parts in your Fusion assemblies to move the way you expect, you\u2019re not alone. Constraining components for realistic motion can feel tricky, especially when sliding or rolling [&hellip;]<\/p>\n","protected":false},"author":5319,"featured_media":81391,"menu_order":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1],"tags":[],"coauthors":[873],"class_list":["post-81389","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fusion","dhig-theme--light"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Use Planar Joints with Tangent Constraints in Fusion - Fusion Blog<\/title>\n<meta name=\"description\" content=\"Phil Eichmiller, Fusion QA Engineer explains how to use planar joints with tangent constraints in Fusion to create smooth, realistic assembly motion.\" \/>\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.autodesk.com\/products\/fusion-360\/blog\/how-to-use-planar-joints-with-tangent-constraints-in-fusion\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Use Planar Joints with Tangent Constraints in Fusion - 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