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How to: ?? Slack in my 2 dof simulator

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Simon Husum, Aug 16, 2016.

  1. Simon Husum

    Simon Husum Member

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    Hi guys.

    I have a question..
    I have a 2 dof seat mover and when i sit in my seat there seems to be a bit of slack sideways in the seat. Approx. 2-3cm to each side.
    My lever arms are completely stable. So the slack is from the construction.
    No slack front/backwards.

    Any ideas how this can be solved? :)

    Perhaps something like the one in the attached picture?
    (The first picture is from my setup so you can see how it is now)

    Thanks

    Regards Simon

    Attached Files:

    Last edited: Aug 16, 2016
    Simon Husum, Aug 16, 2016
    #1
  2. Nick Moxley

    Nick Moxley Well-Known Member

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    My Motion Simulator:
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    CV joints tend to have that "rotational" side effect....Yes the Bar eliminate that. or swap out the pivot for a U joint with no additional movement.
    • Agree Agree x 1
    Nick Moxley, Aug 16, 2016
    #2
  3. Simon Husum

    Simon Husum Member

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    Wow.. Thanks for the prompt answer @Nick Moxley :thumbs

    Have attached a picture of it..

    Can see that it actually will do quite a difference.

    But my brain doesn't understand it in all its glory.. :(:)

    Won't the motors have to push a bit harder and use more amps with the bar attached as the motors would have to "force" the seat through/over the "neutral zone"..
    Or is it just me? o_O

    Attached Files:

    Simon Husum, Aug 16, 2016
    #3
  4. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    A properly designed Panhard style rod will eliminate the wasted energy use in torsional twist: https://en.wikipedia.org/wiki/Panhard_rod

    The rod will need to be more substantial than rod ends tapped to an allen key, though I gather that is for mock up purposes only.
    • Like Like x 1
    noorbeast, Aug 17, 2016
    #4
  5. Simon Husum

    Simon Husum Member

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    Thanks @noorbeast ;)

    Didn't know it was called a Panhard rod.

    Haha.. Yes indeed. It was only for illustrating.
    Don't think the tape and allen key will do much justice if it was mounted like that..
    But tried today to mount it with tape.

    Tried a lot of places today to mount the rod temporarily. But when the seat changes the rod ends isn't alligned the same place.
    So that will cause the seat the have very reduced movement?

    Guess I have to calculate exactly where to mount it and what length it is going to be? Right?
    Asume it has to be outside the joint as showed in the picture?

    Attached Files:

    Simon Husum, Aug 17, 2016
    #5
  6. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    A substantial diagonal between the bottom frame and seat is likely needed, depending on the geometry already involved.

    Replacing the CV joint with a universal joint will eliminate torsional twist, which is why most of us run universal joints.
    noorbeast, Aug 18, 2016
    #6
  7. Simon Husum

    Simon Husum Member

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    My Motion Simulator:
    2DOF, DC motor, JRK, SimforceGT
    Thanks for hour reply @noorbeast ..

    I have read further about a universal joint.

    I think that is the way to go instead..

    I can see that has slupoed by in the preperatiln when I made it..:blush :)

    Thanks for the "assisstance" :)
    • Like Like x 1
    Simon Husum, Aug 21, 2016
    #7