This is a bug that will need to be addressed by the devs. I’ve witnessed that when many symmetric constraints are used in the same sketch, it can lock up elements that are not fully constrained. The Sketcher is still very young, v0.13 is only the second stable release which includes it. Symmetric constraint is very useful but should be used sparingly in the sketch. If the objects are not joined, select the endpoints of each then apply the tangent constraint: this will join the points together and apply the tangency at the same time. ![]() With arcs and circles joined to lines or other arcs and circles, always make sure they are tangent by applying You can apply the equality constraint to arcs and circles, this will apply to their radii. For example, rather than dimensioning two lines that share the same length, apply theĮquality constraint between them - in case you need to change their size, you’ll only have one dim to change, not two. You should always prioritize the geometric constraints. To the left of the separator are the geometric constraints, to the right the dimensional constraints. I am using the development release of FreeCAD, I know the order of the icons was changed, but I don’t remember if that change was done for the stable release or after that. This is the Sketcher constraints toolbar. When you hover over the icons, a tooltip will appear. To use constraints you need to select a sketch object first. Locking down degrees of freedom is done by applying constraints. But I don’t quite understand how I should be locking down the degrees of freedom within the sketch.
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