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AlexK15-Moonstone
15-Moonstone
September 6, 2023
Solved

slot mechanism gets stuck in corner

  • September 6, 2023
  • 3 replies
  • 3086 views

Hello community

 

I'm working on a mechanism where a tray gets held in position by a slot connection.

 

When the pin reaches the turning point in the curve, the parts get stuck:

AlexK_0-1693989297823.png

Is there any way to avoid this problem?

 

Thanks for your help!

 

Best wishes

Alex

Best answer by MartinHanak

Hi,

I don't know much about mechanisms, but try the following...

  • select curve you use as slot constraint reference (I guess it contains two straight lines and single arc)
  • CTRL+C
  • CTRL+V
  • set Approximate option and finish Copy feature
  • redefine slot constraint ... use the curve created via Copy feature
  • test Drag operation

 

3 replies

M
MartinHanak24-Ruby IIIAnswer
24-Ruby III
September 6, 2023

Hi,

I don't know much about mechanisms, but try the following...

  • select curve you use as slot constraint reference (I guess it contains two straight lines and single arc)
  • CTRL+C
  • CTRL+V
  • set Approximate option and finish Copy feature
  • redefine slot constraint ... use the curve created via Copy feature
  • test Drag operation

 

    M
    MartinHanak24-Ruby III
    24-Ruby III
    September 6, 2023

    see video showing my test assembly.

      kdirth
      21-Topaz I
      kdirth21-Topaz I
      21-Topaz I
      September 6, 2023

      In my experience whether you are dragging the "shelf" or the "link", the connection does not know which way to go at the apex of the curve.  You have to switch to dragging the other part to get the connection to continue.

      There is always more to learn.
        kdirth
        21-Topaz I
        kdirth21-Topaz I
        21-Topaz I
        September 6, 2023

        Here is a video of moving the attached simple model (7.0)

        (view in My Videos)

        There is always more to learn.
          A
          AlexK15-MoonstoneAuthor
          15-Moonstone
          September 7, 2023

          Thanks! you are right, it has to be moved in two steps. the problem was, that the mechanism had an error and wouldn't move any more. Martins solution fixed that.

          P
          19-Tanzanite
          pausob19-Tanzanite
          19-Tanzanite
          September 6, 2023

          Hmm, I am thinking that this mechanism goes through a so-called "singularity" somewhere along that rounded corner in the slot path.

          One of the effects could be that the mechanism motion is impossible for the driving link to maintain - so further progression along the slot path is possible only by switching to dragging the other link.  Anyway, that's kind of how this will work in real life, no?  I envision a 2-handed operation is needed to "put away" this shelf...

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