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My sweep won't regenerate
paul_1
Member Posts: 33 ✭✭
I'm trying to sweep a profile along one quarter of an elliptical path. The error is that "Result of sweep intersects itself", but I'm not seeing how that's possible, and the picture Onshape shows me isn't helping. I can't help but think I'm making a beginner mistake... because that's exactly what I am. ;-)
paul
https://cad.onshape.com/documents/71bc7524278347a0ac933851/w/e253e8b86328f1385d062732/e/7f1c0dc00108acc413ca5c73
paul
https://cad.onshape.com/documents/71bc7524278347a0ac933851/w/e253e8b86328f1385d062732/e/7f1c0dc00108acc413ca5c73
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Best Answers
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Then you could use a surface to split and delete. I not sure that is the best way but it would work. See example.https://cad.onshape.com/documents/b0abedc6843cf229ab4f8fac/w/99c7f636901fd0928c97cbb3/e/10de34ce674fa223c1fc3ab80
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An other thought starting with a swept surface and adding fills. The last fill closes the surface and makes a solid.
https://cad.onshape.com/documents/2d9bc9b86baef5743483a868/w/6ed23a39392f04ecf5486cf8/e/a378c42a0636c0dc798d70b6
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You got the idea, after looking at this a bit closer, I realize the real issue is that a sweep produces self-intersecting geometry, that is the reason it is failing not because of the collision with the existing part. Here is another way of doing what you want with fewer steps. https://cad.onshape.com/documents/b0abedc6843cf229ab4f8fac/w/99c7f636901fd0928c97cbb3/e/079e07e839ecd2d998df5827
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Answers
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I would use the revolve command for that. https://cad.onshape.com/documents/b0abedc6843cf229ab4f8fac/w/99c7f636901fd0928c97cbb3/e/10de34ce674fa223c1fc3ab80
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If you only want a surface you could use a sweep. I'm not sure what your design goal is, see the copy that I made. I changed your sweep to a surface and also did a revolve.0
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Thanks! I wish I could do a revolve, but I can't because the path is elliptical. And yours is circular. (Mine was very close to circular -- I've changed it to make the shape more obvious.) My design goal is some much like you produced, but based on an ellipse (or, maybe even, a spline).0
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Then you could use a surface to split and delete. I not sure that is the best way but it would work. See example.https://cad.onshape.com/documents/b0abedc6843cf229ab4f8fac/w/99c7f636901fd0928c97cbb3/e/10de34ce674fa223c1fc3ab80
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The sweep as you are using it
is trying to cut through your existing part. 0 -
I made a correction in my example.0
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Yes, I saw that -- but that little "tang" only appeared after I changed my example. And it's not at all clear where that little thing is coming from.wayne_sauder said:The sweep as you are using it is trying to cut through your existing part.0 -
So, if I understand what you did: You used the same sweep I did, but didn't include the lower rectangular sections, in order to just create a surface. (I didn't know that was possible, so this is good.) And then you encapsulated it in a revolve, though it could have been any shape, right? Like a rectangular block? And then you used the surface created with the sweep to split the new solid, and then deleted the part you didn't want.
Okay, I can do that. I'm curious as to why what I did didn't work, but I'm happy with a workaround.
Thanks!0 -
An other thought starting with a swept surface and adding fills. The last fill closes the surface and makes a solid.
https://cad.onshape.com/documents/2d9bc9b86baef5743483a868/w/6ed23a39392f04ecf5486cf8/e/a378c42a0636c0dc798d70b6
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You got the idea, after looking at this a bit closer, I realize the real issue is that a sweep produces self-intersecting geometry, that is the reason it is failing not because of the collision with the existing part. Here is another way of doing what you want with fewer steps. https://cad.onshape.com/documents/b0abedc6843cf229ab4f8fac/w/99c7f636901fd0928c97cbb3/e/079e07e839ecd2d998df5827
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nice step reduction.0
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Wow -- I never would have thought of that technique. I'm surprised it's possible to define a fill that doesn't actually describe a volume! But just by describing several surfaces (planar or not) as fills, the volume they enclose becomes solid. Slick.glen_dewsbury said:An other thought starting with a swept surface and adding fills. The last fill closes the surface and makes a solid.
https://cad.onshape.com/documents/2d9bc9b86baef5743483a868/w/6ed23a39392f04ecf5486cf8/e/a378c42a0636c0dc798d70b61 -
The technique you guys arrived at (sweeping a profile that doesn't fully-define your finished shape) then using other tools to create the final shape is (I think) the best approach.
Another robust tool for creating the solid in after you have the swept surface (or solid) is the Enclose command. It's under the Thicken command.
Enclose is handy because you can use planes as inputs...this means that you can use your cardinal (or other) planes, and avoid creating extra features or geometry.
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