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What is the best process to complete this design?

steve_clinesteve_cline Member Posts: 8 EDU
in Community Support
I am trying to make an assembly of this stove box: 
It is constructed with sheet metal and rebar.  The inside of the box is hollow which allows smoke from a fire below to be forced into the opening you see in the cylinder and out the back opening of the rectangular box. 

I have some OnShape experience but not with anything hollow like this so I welcome any advice on next steps.  This document is my design so far.  I am wondering what is the best method to make a rectangular cut in the face of the cylinder and the best approach to adding the rebar shown here in the photo. 
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Answers

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    alnisalnis Member, Developers Posts: 449 EDU
    Since you already have the skeleton of the design, you can use the sheet metal model tool to convert the faces to flattened sheet metal parts:
    https://cad.onshape.com/documents/d681eacb63c592a67ca6b525/w/1c6de8cf5cabc563584d7c40/e/6368e1bb19ecb2f249cb1b63

    Then, if you click the sheet metal tab, you'll get flattened parts with the right dimensions:



    You can add the rebar with Neil Cooke's beam feature using the custom profile option, with a circle for your rebar's size in another part studio:
    https://cad.onshape.com/documents/e15c2c668d138f01242d0c80/v/9c3d422daa69798c999d2076/e/2d5660fc1012df9598f00251


    Hope this helps!
    Student at University of Washington | Get in touch: contact@alnis.dev | My personal site: https://alnis.dev
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    steve_clinesteve_cline Member Posts: 8 EDU
    Thanks @alnis for the response.  I had not thought of using the sheet metal tab.  Nice feature!

    I see that you added a hole to the cylinder.  Can you explain how you made it?  I need to move it to the other side of the cylinder and resize it.
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    alnisalnis Member, Developers Posts: 449 EDU
    If you take a look at Sketch 4, you'll see two lines that go across the face I want to split.
    Then, in Split 1, I split that face, making two new ones that can be selected individually.
    Finally, in the sheet metal model, I only pick the face I want to convert.

    Please let me know if you have any other questions! Also, feel free to make a copy of the document so that you can investigate the details of it!
    Student at University of Washington | Get in touch: contact@alnis.dev | My personal site: https://alnis.dev
  • Options
    steve_clinesteve_cline Member Posts: 8 EDU
    edited August 2021
    Looks like the split only gives me the option to split the entire face of the cylinder.  Is it possible to make a partial split so that the opening is only the top half of the cylinder face?
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    alnisalnis Member, Developers Posts: 449 EDU
    Yep! One way to do it is by creating a surface to use for the split (see Sketch 7, Extrude 4, and the updated Split 1 feature):
    https://cad.onshape.com/documents/d681eacb63c592a67ca6b525/w/1c6de8cf5cabc563584d7c40/e/6368e1bb19ecb2f249cb1b63

    (it's a good idea to fully define your sketches, so don't leave them blue like I did!)




    Student at University of Washington | Get in touch: contact@alnis.dev | My personal site: https://alnis.dev
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    steve_clinesteve_cline Member Posts: 8 EDU
    I think I have done most everything correctly but if you look back at my original document, you can see that the split did not seem to remove the entire section from the cylinder and it also performed a split on both sides (i.e. there are two openings, not one).  Any idea what I did wrong there?
  • Options
    alnisalnis Member, Developers Posts: 449 EDU
    Looks like Sketch 2 is in the split tools. If you have a sketch in the split tools it will automatically treat it as a through all symmetric surface extrude (so going both ways, which isn't what you want)
    Student at University of Washington | Get in touch: contact@alnis.dev | My personal site: https://alnis.dev
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