{"id":61053,"date":"2023-08-29T06:00:00","date_gmt":"2023-08-29T13:00:00","guid":{"rendered":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/?p=61053"},"modified":"2024-10-11T11:33:19","modified_gmt":"2024-10-11T18:33:19","slug":"fusion-360-3d-modeling-loose-tolerances","status":"publish","type":"post","link":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/fusion-360-3d-modeling-loose-tolerances\/","title":{"rendered":"The 7 Deadly Sins of Fusion 3D Modeling Pt.\u00a04: Loose Tolerances\u00a0"},"content":{"rendered":"\n

Let\u2019s uncover why loose tolerances are a common cause of modeling failures in Fusion and how to avoid them<\/em>.<\/p>\n\n\n\n

Have you ever tried to model a shape with Autodesk Fusion and failed? I have, many times!\u00a0In the previous post in this series<\/a>, we learned about the 3D Modeling<\/a> deadly sins of \u2018Singularities\u2019 and \u2018Non-manifold Topology\u2019, and we learned how to avoid them!\u00a0<\/p>\n\n\n\n

In this post, we\u2019ll learn why loose topology isn\u2019t helpful and bring the series to a conclusion. <\/p>\n\n\n

Loose Tolerances <\/h2>\n\n\n

Fusion is a highly accurate 3D CAD modeling tool. When we import files from other CAD systems that work to different tolerances, Fusion handles any non-manifold gaps between surfaces by increasing the tolerance around some of the edges and vertices.\u00a0<\/p>\n\n\n\n

For example, when we use the \u2018Stitch\u2019 command to join surfaces together, Fusion allows a tolerance. In fact, Fusion doesn\u2019t change the underlying geometry\u2014it uses a tolerance zone to join the two adjacent surfaces to a single common edge\u00a0<\/p>\n\n\n\n

You could image this tolerance zone as a tube for edges, and a sphere for vertices. <\/p>\n\n\n\n

\"fusion-360-3d-modeling-loose-tolerances\"<\/figure>\n\n\n\n

Loose tolerances could be considered geometry that shares a tolerance zone bigger than 1 Nanometer or 40 nanoinches). This is not a problem in itself, but it could cause problems when adding to the model downstream. <\/p>\n\n\n\n

For example, thickening a face by a small distance could place a vertex outside the tolerance zone of an Edge, but inside the tolerance zone of a Vertex. This is likely to cause a modeling failure. <\/p>\n\n\n\n

Loose tolerances are nearly always brought into Fusion from other CAD systems. If you need to allow a large tolerance to stitch surfaces together, this is an indication that you\u2019ll have problems later. You may also see weird graphical anomalies around areas that have been interpolated.\u00a0<\/p>\n\n\n\n

You can use the feedback from the stitch tool to identify edges that failed to stitch, and which may need your attention. <\/p>\n\n\n\n

The best solution is to return to the original CAD system, tighten up the tolerances, and re-export the model. If this isn\u2019t possible, you may have to rebuild the problem surfaces in Fusion.\u00a0<\/p>\n\n\n

The 7 Deadly Sins of Fusion 3D Modeling<\/h2>\n\n\n

Now you know the 7 deadly sins of 3D part modeling and how to avoid them. Read the rest of the series below:<\/p>\n\n\n\n

Part 1: High Curvature & Near Tangency
<\/a>Part 2: Near Coincidence & Sliver Faces<\/a>
Part 3: Singularities and NonManifold Topology<\/a><\/p>\n\n\n\n

And remember, We can avoid these conditions by following this best practice:<\/p>\n\n\n\n

Avoid teeny tiny ambiguous features. Maintain manifold Topology.<\/em> <\/p>\n\n\n\n

This blog post is based on an Autodesk University class. You can read the handout, download a dataset, and try out some exercises that illustrate the Seven Deadly Sins from the Autodesk University website here:<\/em>\u00a07 Deadly Sins of 3D Part Modeling in Fusion<\/em><\/a>.
\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"

Let\u2019s uncover why loose tolerances are a common cause of modeling failures in Fusion 360 and how to avoid them.<\/p>\n","protected":false},"author":5165,"featured_media":61055,"menu_order":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[353,476],"tags":[392,430,356],"coauthors":[],"class_list":["post-61053","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-getting-started","category-tutorials","tag-3d-modeling","tag-cad","tag-tutorial","dhig-theme--light"],"acf":[],"yoast_head":"\nHow To Avoid Loose Tolerances in Fusion 360 - Fusion Blog<\/title>\n<meta name=\"description\" content=\"Let\u2019s uncover why loose tolerances are a common cause of modeling failures in Fusion 360 and how to avoid it them.\" \/>\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\/fusion-360-3d-modeling-loose-tolerances\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How To Avoid Loose Tolerances in Fusion 360 - 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