![]() ![]() One of the highlights of FreeCAD is its support for a wide range of file formats, including STEP, STL, OBJ, and many more, facilitating seamless collaboration and interoperability with other CAD software. This feature enables efficient design iterations and saves valuable time during the creative process. With its user-friendly interface and extensive features, FreeCAD empowers users to create precise and detailed 3D models effortlessly.Īt its core, FreeCAD employs a parametric modeling approach, allowing users to easily modify designs by altering parameters rather than starting from scratch. So i suppose this is a bug (partial redundant constraints causing breakage).FreeCAD is a powerful open-source parametric 3D modeling software designed for engineers, architects, and hobbyists. However your project assumes that the arc is a half circle (you used tangency constraints at the 2 points), which isn't always the case. The project you attached is correct indeed, as is my example project with the partial redundancy removed. So this should fully constrain the arc, and as chrisb had pointed out, the issue is caused by partial constraint redundancy, and not lack of constraints. The whole arc is created as external geometry in the 2nd sketch, and the normal arc is created using the external center and 2 points. The arc in the master sketch is defined through center + 2 points (a center with 2 points define exactly an arc, actually 2 complementary arcs). You need here to refer to the center and one end of the 1st arc. ![]() You cannot copy an arc with 3 points : an arc is 5 Degrees of Freedom (dof) and 3 points are 6 dof.
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