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merging and hollowing two lofts

mark_prince
mark_prince Member Posts: 3 ✭✭
in Community Support
Hi All

I'm trying to model and 2-into-1 exhaust collector, and I've managed to create the shape I need, but I can't work out how to hollow it. My part is here. I've tried using shell, and in the top and bottom circles, creating an inner circle and then trying to loft-remove between them, but I'm failing. I need a constant wall thickness.

Can you help?
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Answers

  • NeilCooke
    NeilCooke Moderator, Onshape Employees Posts: 6,102 image
    Hi Mark - you can only shell solids, not surfaces. Make a solid loft between the faces then try again?
    Senior Director, Technical Services, EMEA
  • brian_brady
    brian_brady Member, Developers Posts: 505 EDU
    NeilCooke said:
    Hi Mark - you can only shell solids, not surfaces. Make a solid loft between the faces then try again?
    Neil (and Mark),

    I worked on a copy of it last night for about an hour and discovered early on that what Mark had was not solid. I changed the loft to make two solid lofts instead of surface lofts. For the life of me, I couldn't  make a shell that worked with 2 inputs and a single output. I tried splitting, boolean operations, and more that I don't currently recall. All to no avail. Maybe somebody more practiced with these types of shapes will have better luck than me.
  • NeilCooke
    NeilCooke Moderator, Onshape Employees Posts: 6,102 image
    I remodelled it - see if this is what you are after: https://cad.onshape.com/documents/57d1213d6eb98510b91797ed/w/4da614a5b1bbe1e52ac3b516/e/0114b6206874307a5d078cf3
    Senior Director, Technical Services, EMEA
  • brian_brady
    brian_brady Member, Developers Posts: 505 EDU
    I was trying to maintain Mark's original shape. Yours is less "organic" than his original. Maybe the more "organic" shape Mark started with was causing he strange problems I was having when trying to merge the two lofts together.
  • NeilCooke
    NeilCooke Moderator, Onshape Employees Posts: 6,102 image
    Maybe, in Mark's original model the lofts were actually twisted which doesn't help.
    Senior Director, Technical Services, EMEA
  • brian_brady
    brian_brady Member, Developers Posts: 505 EDU
    NeilCooke said:
    Maybe, in Mark's original model the lofts were actually twisted which doesn't help.
    That might explain why they neck down a bit in the middle when just lofting from one circle to another.

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