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Advanced Sheet Metal Pattern Development: Building Complex Parts

How to use CaldereriaOnline.com patterns as building blocks for complex Elbow Tees.

Learn how to develop complex sheet metal parts by combining the patterns in CaldereriaOnline.com. See how an elbow tee can be broken into individual intersections and assembled into one final development.

Jay Laverage
2026-09-12
Ljubljana, Slovenia

También puedes leer este artículo en Español.

How to unfold a complex elbow tee with CaldereriaOnline.com

complex elbow tee 3D view

Not every piece you need to fabricate has a ready-made pattern. Sometimes the geometry is simply too specific or too complicated to be covered by a single development. But that doesn't necessarily mean you need to start from scratch or build the entire part in a full CAD system.

With the tools available at CaldereriaOnline.com, you can sometimes solve a complex part by breaking it down into simpler geometries that the platform can develop individually. Once the individual patterns are generated, they can be combined and trimmed in CAD to produce the final shape. This is particularly useful for complicated branches, elbows, tees, and other intersecting sheet metal parts.

complex elbow tee drawing with dimensions

One example is a complex elbow tee where a 90° elbow intersects a main pipe in several separate zones. Instead of trying to find one pattern that represents the entire assembly, the elbow can be divided into its individual gores, and each relevant gore can be treated as an auxiliary branch pipe. The corresponding pipe intersection pattern is then generated for each gore. The resulting sections can be overlaid with the elbow gores and trimmed to obtain the actual intersection shape.

complex elbow tee - intersections

The process is essentially a matter of solving several smaller problems instead of one large problem. In the example shown in our video playlist, a main pipe and a three-gore 90° elbow are developed separately. Each of the three intersecting gores is processed as a branch, and the resulting patterns are then assembled and trimmed in CAD. The final result is the main pipe with the correct opening and the three modified gore sections that form the elbow tee.

complex elbow tee - unfolded patterns

We have prepared a video walkthrough showing the complete process, from the initial configuration and pattern generation through to the final CAD assembly. It is a good example of how the different sheet metal development tools available on CaldereriaOnline.com can be used together when there is no direct pattern for a particular fabrication problem. You can start with the simpler free patterns and, as your requirements become more demanding, use the more advanced developments as building blocks for your own projects.

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