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Soccer Ball - Truncated Icosahedron Assembly

rod_muirhead943rod_muirhead943 Member Posts: 24 EDU
What are the correct assembly constraint commands to join the hexagons and pentagons to complete the truncated icosahedron.  The students will then 3D print their assemblies.
I am failing measurably. 

Comments

  • john_mcclaryjohn_mcclary Member, Developers Posts: 3,116 PRO
    If the side walls are tapered properly. then fastened should be all you need.

  • rod_muirhead943rod_muirhead943 Member Posts: 24 EDU
    Can I share the file?
  • john_mcclaryjohn_mcclary Member, Developers Posts: 3,116 PRO
    yea, just copy/paste the url of your document 
    and make sure you make it public
  • steve_shubinsteve_shubin Member Posts: 442 ✭✭✭
    edited January 15
    @rod_muirhead943

    see 4th post below
  • steve_shubinsteve_shubin Member Posts: 442 ✭✭✭
    edited January 14
    @rod_muirhead943

    The document should be okay now

  • john_mcclaryjohn_mcclary Member, Developers Posts: 3,116 PRO
    edited January 15
    Soccer Ball | Assembly 1 (onshape.com)

    I had to look up how to calculate a soccer ball. Not much of a polygon person. (had to wiki some maths)
    but here is one way to do it i guess.


  • steve_shubinsteve_shubin Member Posts: 442 ✭✭✭
    @john_mcclary

    VERY NICE JOHN !

  • steve_shubinsteve_shubin Member Posts: 442 ✭✭✭
    edited January 16
    see post below
  • steve_shubinsteve_shubin Member Posts: 442 ✭✭✭
    edited January 16


    https://cad.onshape.com/documents/aa51e464fba34983ad78e2e5/w/4acdfcc9d7f3f9f4b6db37d7/e/25fbc467c63ad85db1f9dd1c


    After seeing @john_mcclary soccer ball, I definitely wanted to incorporate some of his methodology. That was some good stuff that he did. I’m kind of ticked at myself for not thinking of that LOL — come on brain - work

    The way I’m doing it here is going to require an extra assembly tab. So you may want to just bypass the rest of this post

    But if you’re interested in being able to figure out how to make a soccer ball without any calculation, then read on

    There is a second assembly tab used for finding the angle between the different polygons. It was a matter of hinging them to determine where other sides of the polygons would mate together, which in turn, would give the proper angle without calc

    The variable determines the length of one seam in plan view (a straight line) — not an arc along the ball surface. This can be adjusted to change the diameter of the ball. BUT, to get the exact diameter, it’s gonna take a few tries at changing the variable AND updating context in assembly, in order to find the exact diameter you’re looking for — maybe three or four tries. Doesn’t take that long

    Remember — whenever you edit the variable in the Part Studio — that you need to UPDATE CONTEXT in the tab called ANGLE FINDER

    By the way, if you did happen to see the way I did it before, it was convoluted. This way is a lot simpler


  • john_mcclaryjohn_mcclary Member, Developers Posts: 3,116 PRO
    @rod_muirhead943

    Here is a short video showing how to mate the assembly part by part.


  • rod_muirhead943rod_muirhead943 Member Posts: 24 EDU
    Thank you very much!
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