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Trouble Extruding Angled Face

Hi all! I'm a bit new to OnShape, but not new to CAD. I'm a bit hung up on a particular part of a model.

First, here's the mode: https://cad.onshape.com/documents/43d856d66fd0c29bbe2b8830/w/160a670308b9ec270c462e4a/e/73bb0f71302ddfee1b1bd58f

The area I'm hung up on is this:

I created this notch in the side of a panel and I drafted it. Then, I did a sketch on the vertical surface so I could divide it up. What I'm trying to do is extrude (and subtract) the area you see there. Whenever I do this I get "Boolean resulted in no geometry change..."

Anyone know what's going on here? Is this a bit of a bug or do I now know what I'm doing?


  • owen_sparksowen_sparks Member, Developers Posts: 2,284 PRO

    I might be missing the point here but it looks like you have the "add" option selected in the Boolean rather than the "remove".  Add is extruding material into a place where it already exists hence the warning that the feature results in no change to the existing geometry.

    Owen S.
    Production Engineer
    HWM-Water Ltd
  • eric_schimelpfenigeric_schimelpfenig Member Posts: 25 EDU
    Ahh, I must have left that set for the screenshot, when I hit "remove" I get the same error. 

    I've even tried making a new body, and then doing a subtract and I still get the same error. I'm thinking it's got to do with the point it makes and that it shares the same edge as the rest of the body?
  • konstantin_shiriazdanovkonstantin_shiriazdanov Member Posts: 901 ✭✭✭✭✭
    this operation creates a solid body of zero thickness which is not allowed and can't be made in the real life, you need somehow change the geometry around to avoid this
  • owen_sparksowen_sparks Member, Developers Posts: 2,284 PRO
    Yup, what he says ^^

    Production Engineer
    HWM-Water Ltd
  • eric_schimelpfenigeric_schimelpfenig Member Posts: 25 EDU
    I guess that makes sense. I ended up doing this:

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