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Loft to get a cylinder with hole (a hose)

gauthier_östervallgauthier_östervall Member Posts: 99 ✭✭
edited June 2021 in Community Support
Why can't I seem to loft between these faces?

The project: https://cad.onshape.com/documents/c6282b37bc2c57450d81c93f/w/d55aba687ead91b93b3f1925/e/85c614acc7d029ff4a4ea69b
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Best Answer

  • bruce_williamsbruce_williams Member, Developers Posts: 842 EDU
    edited June 2021 Answer ✓
    @gauthier_östervall

    Loft help says  "Nested loops in profiles are currently not supported".

    However, you can do this with two loft commands.  See the gif attached.



    www.accuratepattern.com

Answers

  • GWS50GWS50 Member Posts: 454 PRO
    Would you not be better just extruding the 1st sketch?
    Alternatively you could use the sweep command....see attached
    https://cad.onshape.com/documents/2508b8cedc0f48d7923b9a64/w/dd7e7bad017c6762a65c2faa/e/1ec4cd6a5dfd68df68d7b739

  • gauthier_östervallgauthier_östervall Member Posts: 99 ✭✭
    edited June 2021
    GWS50 said:
    Would you not be better just extruding the 1st sketch?
    I started with an extrude, but then I wanted a draft on the outside but not the inside. The original model where I first saw the issue had a smaller outer circle in the second sketch.
    That's how I'm solving it right now, extruding the whole cylinder (no hole) with draft, then extrude remove the hole without draft.

    But I'm mostly looking to learn, so although I'm not blocked by this issue, I'd like to know what's going on: am I doing it wrong and Onshape failing to do this is legitimate (why?), or is it an Onshape limitation?
  • bruce_williamsbruce_williams Member, Developers Posts: 842 EDU
    edited June 2021 Answer ✓
    @gauthier_östervall

    Loft help says  "Nested loops in profiles are currently not supported".

    However, you can do this with two loft commands.  See the gif attached.



    www.accuratepattern.com
  • gauthier_östervallgauthier_östervall Member Posts: 99 ✭✭
    @bruce_williams So, limitation of the tool. Thanks for taking the time to answer!
  • robert_b092robert_b092 Member Posts: 4 ✭

    I am trying to follow along with the gif but the inside hole gets lost after I Loft.

  • glen_dewsburyglen_dewsbury Member Posts: 1,061 PRO

    Here's a sample of sweep and extrude/draft. and revolve to accomplish what you're looking for.

    Loft is the least effective option for this part.

    https://cad.onshape.com/documents/4f8389d42070eec6681971ce/w/0edbbd611d0753c608506df9/e/d38d6ae6914e398375f04078

  • martin_kopplowmartin_kopplow Member Posts: 828 PRO
    edited June 20

    Siometimes, it helps to just eliminate the loops. e.g. by using half-circles, if the design is symmetrical to at least one plane:

    LoftingTubes.gif

    https://cad.onshape.com/documents/26adf205741a5240d4e902f9/w/3e7982592d2de33e234ac9b1/e/1cc77cf8dd83e3915b85f08b?renderMode=0&uiState=685519b3f1431611855fa245

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