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Having a sweep prob as well - FC crashes when trying to sweep the example attached. |
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@herrdeh please provide a backtrace (unless the ticket provides one). I wasn't sure |
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@herrdeh I have opened your sketch. I am not sure what you intended. I can sweep "Querschnitt VerstDreieck" along "Verlauf VerstDreieck" without a crash. However, I am not sure the result is what you intended, because "Querschnitt VerstDreieck" is a really weird sketch, there is an almost hidden arc which crosses the profile. merkwuerdige_sketch.png (5,853 bytes) |
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Now about the original problem in the German forum. I have made the part again in PDN (loading the original file in 0.17 is a big problem, the arc of ellipse will not move the foci, no way to sweep without a body). Sweep functionality seems to be quite broken (would not reconstruct after changing the sweeping path, but would work sometimes if the sweep object is created again). However, either it constructs (and it is a solid) or it does not construct at all. It is ok to leave this bug open, but I think more to focus in what is wrong with sweep in 0.17. About the tangency, in the reconstructed sketch the dot product is 0.0. Maybe the problem was related to how the sketch was built (I changed a couple of constraints, which may provide better results). rfrank_part.png (35,160 bytes) |
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Since the original problem is with using Part Sweep, isn't redoing the part in PartDesignNext using a PDN Additive Pipe out of the purview of this report? Both tools may be based on the same underlying OCC tools, but the tools are not the same. |
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Had a look at the original German topic and the file Test4.FCStd. Actually, this is a well-known Sketcher issue that is easily resolved by using a point-to-point tangent constraint instead of coincident & tangent. In the file Test4_fixed_normandc1.fcstd posted on the forum, I edited the Kontur1 sketch and deleted the coincident constraints joining the lines with the ellipse; I deleted the tangent constraints as well. Then I created point-to-point tangent constraints. This resolves the problem. https://forum.freecadweb.org/viewtopic.php?f=13&t=14207&start=10#p206945 So the problem has nothing to do with the sweep function. Furthermore, the wiki already mentions the Sketcher tangent constraint issue. https://www.freecadweb.org/wiki/Constraint_Tangent#Between_two_endpoints_.28point-to-point_tangency.29 |
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@normandc and that is one of the reasons why it is great to have you around. Thanks for solving it. I am closing this ticket. |
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Constraint issue as indicated by Normandc. It was discussed in the forum the possibility of transparently substituting tangency on edge + concident on endpoint to ptp tangency. |
- Anonymous
