Where is the non-manifold body here?

tristan_schaaf
tristan_schaaf Member Posts: 4 ✭
in Community Support
I'm trying to model some stairs here, with 0 experience in CAD, so i'm basically just throwing stuff at the wall and see what sticks. I want to reuse this model several times in the project, and eventually print it. So I thought it would be wise to create a single part via a boolean.

Now; I don't know if that is even necessary, if the way I gotten to my part is the 'correct' way (if there even is such a thing). But besides that, which i would welcome the comments, I'd like to know why the boolean won't hold? Why doesn't it like this even though the stairs is constrained to bars...?

Best Answers

  • NeilCooke
    NeilCooke Moderator, Onshape Employees Posts: 6,116 image
    Answer ✓
    An edge can only have exactly two faces - here you have 4.


    Senior Director, Technical Services, EMEA
  • Matt_Shields
    Matt_Shields Member, Onshape Employees Posts: 991 PRO
    Answer ✓
    Where the risers met the treads was non-manifold.

    I dropped the tread down 1mm and the boolean worked.

Answers

  • NeilCooke
    NeilCooke Moderator, Onshape Employees Posts: 6,116 image
    Answer ✓
    An edge can only have exactly two faces - here you have 4.


    Senior Director, Technical Services, EMEA
  • Matt_Shields
    Matt_Shields Member, Onshape Employees Posts: 991 PRO
    Answer ✓
    Where the risers met the treads was non-manifold.

    I dropped the tread down 1mm and the boolean worked.

  • tristan_schaaf
    tristan_schaaf Member Posts: 4 ✭
    I was hoping the extrudes towards the beams would've solved that. But i guess that doesn't count?
  • _anton
    _anton Member, Onshape Employees Posts: 553 image
    Better approach is to make separate parts and put them together in an assembly, or to group everything as a composite part.

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