![]() You only need one part that you can reuse via links.Ĭreating a link, however, is all not at all obvious and requires performing a particular sequence of actions: selecting a part (Body object) in the project tree, then selecting an assembly document in the document tabs, then clicking a Link button in the toolbar. 4 screws of the same type to fix a motherboard to a plastic box, you don’t need 4 instances of the same screw geometry. The general idea is that if you have e.g. But A3 is what this API was designed for in the first place. A3 is not the only assembly workbench to rely on the App::Link API to reference objects instead of copying them, Assembly 4 also does it. The workbench provides two ways to build an assembly from parts saved as external files: importing from STEP files or linking (see below) FreeCAD projects that are already opened in the program. ![]() This is likely how most A3 users approach creating assemblies. You can create new parts, then drag them into the Parts section of the project tree, then they will become usable in the assembly.īottom-up design model. Assembly 3 makes the top-down design model a first-class citizen. This approach is technically available in A2 and A2plus, but it is not a recommended way of using those workbenches. This approach makes navigating a complex project fairly straightforward. Assemblies can contain sub-assemblies, in which case each sub-assembly will carry its own set of constraints, elements, and parts. a point of one part and a plane of another part. Elements are the features of parts that are used to create a constraint, e.g. In A3, an assembly consists of constraints, elements, and parts. Here are some of its most significant characteristics. Workflow and ease of use Īssembly 3 is substantially different from other assembly workbenches in multiple aspects. The Assembly 3 workbench continues to be maintained and is available to users of upstream FreeCAD as an addon and is now part of this larger project, the ‘LinkStage’ fork. Some of the architectural changes have already been merged to upstream FreeCAD, others are getting there. Some 4 years later, Zheng Lei aka “realthunder” created a Python binding for the solver, then used it to create his own assembly workbench for FreeCAD.įurther changes in the workbench required patching FreeCAD, so realthunder created a friendly fork of the entire program, which over time became his primary project with many other changes and add-ons not available in upstream FreeCAD by default: the pie menu, transparent docks, and others. ![]() In 2013, Jonathan Westhues took the FOSS community by surprise releasing the source code of SolveSpace, his parametric 2D/3D CAD software built around a very capable custom solver. Now let’s talk about the Assembly 3 workbench. We started out with a conversation about why we need a default assembly workbench in the program, then reviewed Assembly 2 and A2plus. ![]() This is the fourth part in the series where we explore the possibility of creating a default assembly workbench for FreeCAD. ![]()
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