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Following a curved path in an assembly

asko_kauppiasko_kauppi Member Posts: 56 ✭✭

If I want the vehicle to follow the curved rail (blue), what kind of joints can I use?


I have tried using my imagination but cannot see, how this can be made to move in Onshape.

In other tools, I can imagine creating a mate between the wheels that then "slides" along the curved path. I will likely make a revolute joint since the curved section is a circular arc. How would you approach this?

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Answers

  • David_YL_NguyenDavid_YL_Nguyen Member, Onshape Employees Posts: 80
    Hey @asko_kauppi,

    Could you share a link to your (public) document so people can have a look? 
    Should probably be feasible with a couple of tangent mates. Thanks
  • asko_kauppiasko_kauppi Member Posts: 56 ✭✭
    edited October 2023
    [...]
    Could you share a link to your (public) document so people can have a look? 
    Should probably be feasible with a couple of tangent mates. Thanks
    Of course! V18, then open "Vehicle Rolling A":


  • asko_kauppiasko_kauppi Member Posts: 56 ✭✭
    I added a tangent mate between the front wheel and the curved main rail, in V19.



    This is the first time I'm using a tangent mate. Did read the documentation, but here it's clearly not doing what I would expect.

    Expected:
    - wheel surface follows the curved rail

    Actual:
    - there is some constraint, but the selected faces don't touch
  • asko_kauppiasko_kauppi Member Posts: 56 ✭✭
    I still made one - simplified - model of the situation. 
    https://cad.onshape.com/documents/02c303679e6677195f7b884e/v/54498b3cede9361366cb7557/e/7e1781847d155c549f526939


    1. If I choose a face for the Tangent Mate, it acts weird
    2. If I instead choose an edge, things remain more tidy

    What I did to create such a mid-edge is make a slight draft to the extrusion of that wheel. This will likely get me further with my model, but clearly work could be done to improve the Tangent Mate.
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