Welcome to the Onshape forum! Ask questions and join in the discussions about everything Onshape.

First time visiting? Here are some places to start:
  1. Looking for a certain topic? Check out the categories filter or use Search (upper right).
  2. Need support? Ask a question to our Community Support category.
  3. Please submit support tickets for bugs but you can request improvements in the Product Feedback category.
  4. Be respectful, on topic and if you see a problem, Flag it.

If you would like to contact our Community Manager personally, feel free to send a private message or an email.

Morbius

aeden_mooreaeden_moore Member Posts: 2 EDU
How do you model morbius?

Comments

  • SethFSethF Member Posts: 71 PRO
    Do you possibly mean a möbius strip?
  • john_mcclaryjohn_mcclary Member, Developers Posts: 3,634 PRO
    edited May 21
    Here is one way I suppose. möbius | Part Studio 1 (onshape.com)

    Parasolid won't allow the surfaces to join. So, the closest I could get the two edges was 0.000001" apart



    If you try and make it a part with thickness, then the closest I could get was .0001" gap


    If someone could create a "twist along path-Sweep" that would make this all easier. But for now, here is a manual way of doing it.
    Should be enough for 3D printing I would assume the two ends would fuse naturally, or else some glue would finish the job.

    The first two sketches and the projected curve were not necessary, I just wanted to play around a bit more with a fancier shape :smile:


    Man, I love playing with Onshape sometimes..

  • steve_shubinsteve_shubin Member Posts: 748 ✭✭✭✭
    Here is a method using the 3D Spiral tool

    The closest I could get is .000079

    https://cad.onshape.com/documents/665bea71fed01d7fce44e077/w/e82583e298725196049ee171/e/ccfefab5d0512cd365ade246


  • john_mcclaryjohn_mcclary Member, Developers Posts: 3,634 PRO
    I tried to start with 3D spiral, but couldn't get half a rotation, and gave up.

    What you did. . . Whoa... I didn't get what you were doing until I rolled it back to the beginning and stepped forward one at a time. Once the loft hit it finally clicked. Very cool
  • steve_shubinsteve_shubin Member Posts: 748 ✭✭✭✭
    edited May 23
    @john_mcclary

    Thanks John. I really appreciate that. Yeah my old brain seemed to work this one RARE time. LOL

    Yeah that lead in line on the sketch was the exact length as the circumference of the circle (2*Pi*4)     So I had ‘HALF A REVOLVE’ of the spirals before they ever hit the circle. And the other half revolve happening within the circle

    It would really be nice if the 3D Spiral tool would allow for other than whole number revolutions. It would’ve saved a lot of steps

    Another thing — I realized I didn’t need two booleans so I eliminated one of those. There is now just one boolean in the feature list

    One thing that had me bewildered, was trying to figure out if there was a way to split the curved 3D lines (the spirals). But there seems to be no way to break or cut a spiraled line, or at least, there’s no way I  could come up with. So I had to do the extrusions and split the surfaces, and then use the edges of those surfaces for the loft. But if somebody knows a way to break or cut 3D lines, I’d really appreciate the info on how to do it

    I likely could’ve used one extrusion for both spirals, instead of two. But I wanted to extrude each spiral AWAY from the top plane or away from each other, so I used 2 extrusions.

    But when it all comes down to brass tacks John, you still got it quite a bit closer together   —   .000001

    How you did that is mind boggling !


  • john_mcclaryjohn_mcclary Member, Developers Posts: 3,634 PRO

    But when it all comes down to brass tacks John, you still got it quite a bit closer together   —   .000001

    How you did that is mind boggling !


    guess and check my friend :p
Sign In or Register to comment.