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Yet another Loft question

tom_augertom_auger Member Posts: 132 ✭✭
in Community Support

Sigh. Lofts.

I deliberately built these three profiles to have the same number of points, and drew them in the same clockwise order, I'm even using Connections and yet the loft engine somehow is twisting two pairs of vertices.

How to disentangle this mess?

image.png
Tagged:

Answers

  • Kevin_CowlesKevin_Cowles Member, Onshape Employees Posts: 68 image

    Do you have a link to the model? It could be that its self intersecting regardless of having the correct connection points defined. Happy to peek!

  • S1monS1mon Member Posts: 4,125 PRO

    Can you share a public document? That doesn't look like something where you should need to manually use connections.

    Simon Gatrall | Product Development, Engineering, Design, Onshape | Ex- IDEO, PCH, Unagi, Carbon | LinkedIn

  • tom_augertom_auger Member Posts: 132 ✭✭

    Thanks @Kevin_Cowles and @S1mon for being generous with your time on this.

    Here's a shared link: https://cad.onshape.com/documents/d372e0f2c329dfb8015def94/w/a7eeda0f8870916fcf82d1ce/e/97b24175a4f9db2b41f41d68?renderMode=0&uiState=69cedd1265d0d166f12491c7

    I can make it "work" if I loft in two parts and boolean the whole thing.

    I was also surprised to learn that the guide edges must be coincident with the edge of any profile being used. For that reason, I would need to make a few adjustments to use the guide edges, but that was a step I was reserving after I got the loft to work on its own.

  • S1monS1mon Member Posts: 4,125 PRO

    That ended up being more complicated than I initially thought. A few issues:

    1. Some of your sketches were not fully defined. This can cause a lot of issues with loft profiles lining up with guides.
    2. Connections work when Loft can easily create some splines to connect the profiles, but in this case, it wants to make edges which twist over one another which is a no-go.
    3. It's not entirely clear what you were after, but I made some guesses.
    4. It's sometimes easier to model things as surfaces and then make a solid.
    5. I'm sure I could have taken fewer steps, but I leave that for you to clean up

    https://cad.onshape.com/documents/2a4e2ca3944301233394e733/w/7ce157ee9051f8a5f04dfd6b/e/c17914bd587f011b7649ea00

    image.png

    Simon Gatrall | Product Development, Engineering, Design, Onshape | Ex- IDEO, PCH, Unagi, Carbon | LinkedIn

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