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How to construct a dome?

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  • A Offline
    Alohaa
    last edited by 20 Dec 2022, 09:03

    Hello,

    around the central vertical line in the attached file I want to construct a dome with a hollow star-shaped object going vertically through the whole material.
    The purpose: a roof for the tower also contained in the file.
    Note: the construction should change from a rectangular ground plan that fits inside the top of the tower to a circle.
    The dome should protrude 5mm from the side of the tower.
    All my attempts to construct such an object have failed so far.

    Actually, I would also like to add one or more moons on the side that fits the curvature and that goes vertically (it has to be vertical because I want to mill the whole thing and I can't mill at an angle), through the whole material, but that is even more complicated and probably too complicated.

    Sincerely
    Alohaa


    Kuppel.skp

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    • A Offline
      Alohaa
      last edited by 20 Dec 2022, 10:20

      ...and ideally the dome would be hollow, with a wall thickness of 8mm.

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      • S Offline
        samodelkin_77
        last edited by 20 Dec 2022, 12:44

        I'm not sure I understood you correctly, but suddenly I guessed right))


        20-12-2022__2635.jpg


        Kuppel 1,1.skp

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        • A Offline
          Alohaa
          last edited by 20 Dec 2022, 16:46

          Thank you very much for all that work!
          It's almost what I wanted. The only thing I had imagined differently: at the bottom it should start as a square and stand about 5mm above the edge of the tower, and then go into a curve; the base should be like in the attached picture - I didn't find a better example-, at the top of course different because there is a star-shaped cut-out there. I don't know if this is possible with SU.


          Loft.PNG

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          • A Offline
            Alohaa
            last edited by 29 Dec 2022, 14:48

            I managed to construct a dome myself, but probably in a more complicated way than SU allows. There's probably a simpler solution of copying the inside of the dome and enlarging it to construct the outside; I drew both line by line, and it eventually worked out.
            Above I cut out a star, but I didn't know how to put it on the dome, so I created a separate GCode for the star.


            Unbenannt.png


            Dome.skp

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            • H Offline
              HornOxx
              last edited by 29 Dec 2022, 15:24

              ...just as a suggestion Alohaa - if you downsave your SKP file posted here, e.g. to version SkUp 2017, you would give almost everyone here the opportunity to deal with your questions 😉

              never trust a skinny cook

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              • E Offline
                ely862me
                last edited by 29 Dec 2022, 15:39

                Once you have the desired profile shape you can use follow me. An then intersect geometry to subtract the star shape. But I believe your method is better when working with the cnc. Mill the star afterwards.


                Kuppel a.jpg

                Elisei (sketchupper)


                Before no life was done on Earth it was THE LIFE ITSELF...GOD
                Come and See EliseiDesign

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                • A Offline
                  Alohaa
                  last edited by 29 Dec 2022, 16:45

                  "downsave your SKP file posted here"
                  oh yes, sorry, I had forgotten that

                  The follow me method is indeed much more efficient.
                  I should try if the mill has a problem with a structure generated by that method.


                  Dome 2017.skp

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