11/30/2022 0 Comments Freecad lesson![]() Which means they won’t prevent the Pad operation. ![]() Construction lines are of blue color in a sketch, and when you leave the sketch edit mode they are discarded by the system and made invisible. To fix this, you need to turn them into construction lines. I understand that you used this line and rectangle to position your circles, but they are making the face fail. There’s also a small diagonal line joining the upper left corner of the outer rectangle and the upper left circle. Those are intersecting elements and cannot produce a valid face. In your sketch, you have an inner rectangle with circles placed on each of its corners. This profile main contain other closed profiles, but they must not cross the outer profile. For the face step to succeed, the sketch needs to contain a single enclosed profile. The way Pad works internally is it creates a face from the profile in the sketch, then it extrudes the face to build a solid. If you are attempting to pad the sketch in the screen capture you provided, the error is caused by intersecting elements in your sketch. I’ve also done a little icon work in v0.13 and I manage packages for Ubuntu Linux. #Freecad lesson softwareHelping people get the hang of this software is one of the ways I’m helping the project. I am firmly commited to using open source software for my own needs, so it’s one reason for me to stick with FreeCAD. #Freecad lesson freeIf you need more than that, then you could look at the free commercial software that’s available. It’s just that when the assembly module comes out, it will be a whole lot easier. But it’s doable, thousands of designers have been doing the same in AutoCAD for decades. It does not have a 3D relationship-based assembly module yet, so to assemble parts together it’s a little like in AutoCAD: you need to place your parts manually, and the assembly won’t be parametric. I’ll be honest, the software is nowhere complete yet, and some parts of it can get buggy. Well I guess it depends on whether it’s enough for what you’re planning. That being said, is FreeCAD what you’d recommend for a free/low cost CAD and/or solid modeling tool? If you don’t mind hearing a funny French Canadian accent, I’ll even be willing to record a video. If you want you can supply me a sketch you’ve done and I’ll give you specific advice on it. Of course this only covers the surface of the matter. ![]() This advice comes directly from the developer of the Sketcher internal solver, who told me the length constraint requires more calculation by the solver. For vertical and horizontal dimensions, use the It should only be used when you need to set an angled dimension. When using dimensional constraints, use the I recommend centering a rectangle to the origin because this will allow you to use mirrored features later on. Simply select two diagonally opposed points on the rectangle, then the origin point, then apply the symmetric constraint. The symmetric constraint can for example be used to center a rectangle on the Sketch origin. 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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