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Showroom DIY 2DOF simulator

Discussion in 'DIY Motion Simulator Projects' started by Erwan960, Sep 27, 2013.

  1. Poo9jao

    Poo9jao New Member

    Joined:
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    My Motion Simulator:
    2DOF, DC motor, Arduino
    Thank you,verygood is post.
  2. piloulou

    piloulou New Member

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    My Motion Simulator:
    2DOF
    magnifique super post
  3. Metaverum

    Metaverum New Member Gold Contributor

    Joined:
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    My Motion Simulator:
    2DOF, 3DOF, Joyrider
    Hello,

    I would like to ask for some clarification on some general things related to building motion platforms. I wasn't sure where to ask but I will be building a miniature 2DOF simulator for my first project, so I guess this will work.

    I have some questions related to the mechanical construction of motion platforms, mainly connecting various components together.

    I will post three 2DOF motion platforms, where each have a varying motor position and rod connection. All these platforms are from the talented people of this community.

    As you can see in all 3 images, I am puzzled as to how the motor position is chosen in motion platforms. You can see that image 1 has the motors positioned a little forward with the U-joint behind, image 2 has the motors positioned all the way back, and image 3 has them positioned quite far away and the rods don't even connect vertically. However, these are all working systems. How do you decide on this?

    For one, I am assuming the u-joint has to be right below the center of gravity, or at least below the player? And further on, how do you decide on how to connect the rods, so that they will be able to rotate the platform to every possible extent (as required by the simulation). How do you also choose what type of rods to use to make sure that they do not break under pressure and use?

    I am foreign to all these concepts and this is my first ever question to this community. I hope to be able to build many cool simulators with the help and support of all of you. Can't wait to share my own work!

    Thanks. :)

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  4. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

    Joined:
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    Innovative tech specialist for NGOs
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    My Motion Simulator:
    3DOF, DC motor, JRK
    All simulators are a compromise of some sort, and many design and other considerations come into play, from aesthetics and cost to parts availability and physics.

    Th U-Joint should be placed as close to the seat as possible and the rig should be balanced with you and all peripherals attached: https://www.xsimulator.net/community/faq/universal-joint-placement.108/

    If using wormdrive boxes a very slight positive weight balance bias preloading the gearboxes helps minimise the inherent backlash: https://www.xsimulator.net/community/faq/wormdrive-backlash.293/

    SimCal lets you play with some of the possible design Vs physics trade offs that are inherent in any rig: https://www.xsimulator.net/communit...e-linear-speed-and-forces-of-your-design.270/

    There are also other design/experiential considerations, such as seat shaker Vs full frames: https://www.xsimulator.net/community/faq/full-frame-vs-seat-shaker-designs-which-is-better.213/

    The designs you have posted are commonly referred to as a full frame knee design, a compact (rear motor) seat shaker design, and a shoulder mount seat shaker design. All have their pros and cons.
    • Informative Informative x 1
  5. Metaverum

    Metaverum New Member Gold Contributor

    Joined:
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    +7 / 0 / -0
    My Motion Simulator:
    2DOF, 3DOF, Joyrider
    Thank you for the links, very informative! I'm looking forward to trying out SimCal, as my main project is quite a complex design. I wanted to build a miniature 2DOF initially just to get started. So, regarding the bolting position of the rods, the u-joint FAQ page says the following:

    "You also need to balance the rig to determine where it bolts to the seat base".

    I understand that this is doable for miniature designs, or perhaps even actual one-person simulator designs, but let's say a larger design like the following, how can you figure out the center of gravity?? I believe this is a couple of hundred kilograms and not something you can easily figure out with a round pipe.

    [​IMG]
  6. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

    Joined:
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    Innovative tech specialist for NGOs
    Location:
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    Ratings:
    +8,108 / 40 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    Where are design is such that the load may vary it has to be powerful enough to compensate for all possible variables in load and distribution.
  7. Metaverum

    Metaverum New Member Gold Contributor

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    My Motion Simulator:
    2DOF, 3DOF, Joyrider
    Is it safe to assume simply the geometrical center as center of gravity and then install powerful motors to keep the structure from breaking under load?
  8. Marksman

    Marksman New Member Gold Contributor

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    Motor.jpg Hey there;

    I´m actually thinking about the best way to connect the shaft with the "lever" to move our upper element.
    Do you have any hints for shaft-to-collar connection ? So far its planned like you can see in the pictures. The only missing part is the connection between motor and the rest.

    We also have an own thread, go visit us there if u want to stay updated! cya

    Motor 2.jpg 59684
    thanks for your help guys
  9. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

    Joined:
    Jul 13, 2014
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    Innovative tech specialist for NGOs
    Location:
    St Helens, Tasmania, Australia
    Balance:
    96,552Coins
    Ratings:
    +8,108 / 40 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
  10. coolfish206

    coolfish206 New Member

    Joined:
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    My Motion Simulator:
    2DOF