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Radical (stupid?) idea for 2DOF platform

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by niterida, Feb 25, 2024.

  1. niterida

    niterida Member

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    Would this setup work if I only wanted a 100mm of platform travel from the rear ?
    AOOMTFOI.jpg There are a few reasons for wanting this setup - cost is one of them, hence the DC motor drawn, but with just 2 motors it might be feasible (cost wise) to use linear actuators (something like this : https://www.simxperience.com/shop/sx-4000-150-3ft-150mm-scn6-motion-starter-kit-37?category=9#attr= ?) if that would be a way better option.
    Last edited: Feb 25, 2024
    niterida, Feb 25, 2024
    #1
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    I presume you mean a design with the pivot at the very front and motors at the rear.

    If so that is not likely to be cost effective, compared to a traditional pivot under the user, as your design would require far more powerful motors.

    Have a play with SimCalc to help get your head around the tradeoffs between design Vs physics between those two design options: https://www.xsimulator.net/communit...e-linear-speed-and-forces-of-your-design.270/
    noorbeast, Feb 25, 2024
    #2
  3. niterida

    niterida Member

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    Yes
    Yes I realise that but it has other benefits for my situation.
    I was also hoping that not requiring much movement would help ??
    Will use that to see how much power I need - I do understand the differences but have my reasons for not wanting the usual pivoting setup
    Cheers :)
    niterida, Feb 25, 2024
    #3
  4. niterida

    niterida Member

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    First simcalc attempt :
    SimCalc1.jpg
    Does that look right for my inputs ?
    The pivot will be right at the front and at the same level as the motors.
    The rods will be little short ones basically ending where the X and -Z lines are in the drawing.

    And how do I read the outputs ?
    I read the Help box and it would seem to me that it is indeed feasible ??
    niterida, Feb 25, 2024
    #4
  5. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Marginally, as torque efficiency of levers is most effective at right angles and drops off rapidly after about 38 degrees, so the less movement from zero the more efficient torque utilisation.

    Apologies but SimCalc will give a false indication here, as it presumes the mass is evenly located over the pivot, like a seesaw, where in your case all the mass is behind the pivot, like a wheelbarrow:

    [​IMG]
    noorbeast, Feb 25, 2024
    #5
  6. Gadget999

    Gadget999 Well-Known Member

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    My Motion Simulator:
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    move the pivot to below the cog
    Gadget999, Feb 25, 2024
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  7. niterida

    niterida Member

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    Yes I understand thats what you should do, but I have my reasons for not wanting to do that.
    I am however having a rethink to see if I can move it and still keep my reasons for not moving it, if that makes sense :think
    niterida, Feb 25, 2024
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  8. niterida

    niterida Member

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    How about this with either DC Motors or SCN5 or 6 actuators at the foot. Given that I only want 100mm of travel at the motor end I assume this would be a better solution ?
    If so DC motors or linear actuators ? Personally would prefer linear if they will work, but scared off by the cost :(
    niterida, Feb 26, 2024
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  9. niterida

    niterida Member

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    SCN56FM.jpg
    niterida, Feb 26, 2024
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  10. niterida

    niterida Member

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    niterida, Feb 26, 2024
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  11. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Yes, that design would allow you to properly balance the rig.
    noorbeast, Feb 26, 2024
    #11
  12. niterida

    niterida Member

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    With DC Motors and short levers at the front ??
    niterida, Feb 27, 2024
    #12
  13. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    noorbeast, Feb 27, 2024
    #13