![]() ![]() FreeCAD supports 2D objects like lines, rectangles, arcs or circles, as well as various 3D primitives (box, sphere, cylinder, cone, torus), each of which can then be manipulated in various ways (translation, rotation, mirroring, scaling, offset and more). If you've samples to hand then FreeCAD can already import DXF, OCA/ GCAD, SVG, STP/ STEP, IGS/ IGES and other formats, a quick way to get started and see what the program can do.īut if you prefer then you can also create a new document from scratch. The program's 0.12 version number tells you it's not yet ready for prime time, but if you're interested in this area - particularly if you're familiar with Python scripting - then there's already plenty to explore here. So i suppose this is a bug (partial redundant constraints causing breakage).FreeCAD is a powerful 3D CAD modeler and drawing tool which is targeted squarely at the mechanical engineering and product design fields. 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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