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1-Visitor
Feb 6, 2012 5:45 AM UTC
Question

How can I create a Möbius Strip?

I'm really struggling with this issue. Does anyone know how to create a nice, visually pleasing möbius strip in Creo Schools addition? Here is what I really want the model to look like: http://sketchup.google.com/3dwarehouse/details?mid=316a27ba42a11a71abdffc6614cbf81a&prevstart=0 (the model is done in skechup, free from Google, if you are wondering about how to open .skp.

I need all the help I can get, thank you.

    18 replies

    24-Ruby IV
    Feb 6, 2012 6:28 AM UTC

    Some mobius strip/gear models at GrabCAD site: http://grabcad.com/library/tag/mobius

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    1-Visitor
    Feb 6, 2012 12:04 PM UTC

    Off hand, I think you could do it with a swept blend on a circular trajectory. Just start and end with a square and move the start point to create the 'twist'.

    * You may have to do it in two semicircular sections.


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    Patriot_1776
    22-Sapphire II
    Feb 6, 2012 2:40 PM UTC

    Variable section sweep would be what I'd use. It would make sure the strip length would remain constant, something that would be tough to do with a swept blend.

    Of note, I think I came up with a "new" type, and am looking into whether there is a aplce to submit my model t see if it meets the qualifications. I BELIEVE it does, as I've made a paper model, but we'll see.

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    1-Visitor
    Feb 6, 2012 3:42 PM UTC

    In case Lucas needs a bit more info:

    • Make a variable section sweep using a circle as the trajectory.
    • Use a rectangle as the shape of the section (or someting more creative after you try this).
      • Allow there to be an angular dimension that will allow the rectangle to rotate.
      • The section should only be constrained to itself. Meaning no dimensions to an axis line (other than the angular dimension) or perpendicular constraints to the axis lines, etc.
    • While inside sketcher, create a relation (Tools>Relations) such as sd16=360*trajpar*1. Substitute sd16 with your angular dimension's alias. The 1 after trajpar can be increased to add rotations.

    I hope this works for you, let us know.

    -Kevin

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    Patriot_1776
    22-Sapphire II
    Feb 6, 2012 5:32 PM UTC

    Why a rectangle? A mobius "strip" is just that, a surface. Also, only odd increments of 1/2 turns (180deg) make a Mobius Strip (i.e.: 180deg, 540deg, etc.).

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    1-Visitor
    Feb 6, 2012 5:41 PM UTC

    Lucas,

    By the way, I do not know the definition for Mobius Strip, I only saw a picture. If what Frank says is correct, then adjust accordingly.

    Regards,
    Kevin

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    1-Visitor
    Feb 6, 2012 5:55 PM UTC

    This was done using two swept blends, though I think Frank's solution is probably more elegant.

    http://dl.dropbox.com/u/11404499/prt0001.prt.2

    Good luck!

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    Patriot_1776
    22-Sapphire II
    Feb 6, 2012 8:19 PM UTC

    Interesting....MOBIUS_STRIP-02.JPG

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    1-Visitor
    Feb 6, 2012 8:25 PM UTC

    Well...?

    How about a .prt file so it can be interesting to others .

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    Patriot_1776
    22-Sapphire II
    Feb 6, 2012 9:01 PM UTC

    Ahhh, that's the rub. I'm going to try it one more time without a technique I developed, and if so, I'll post it. If it can't be created any other way, I'll have to save it for my future business in teaching Pro/E.

    ....and besides, it's still interesting.

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    1-Visitor
    Feb 7, 2012 2:46 PM UTC

    2GPPOWF0_JL3@0$}YH]9~$D.jpg

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    Patriot_1776
    22-Sapphire II
    Feb 7, 2012 8:09 PM UTC

    Buddy, it looks to me like there's a full 360deg rotation there. If so, it's not actually a Mobius. I true Mobius only does a half twist per revolution, or odd increments of half twists. Can you attach a STEP file please?

    Thx.MOBIUS_STRIP-03.JPG

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    1-Visitor
    Feb 8, 2012 12:10 PM UTC

    Why didn't you upload the PRT.

    my english is poor ,i cannot explain clear what is my mean.

    this is my prt .(creo 1.0)

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    1-Visitor
    Feb 7, 2012 8:39 PM UTC

    2-7-2012 3-38-35 PM.jpg

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