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DIY DOF Question

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Sam Neall, Jul 1, 2019.

  1. Sam Neall

    Sam Neall New Member

    Joined:
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    My Motion Simulator:
    2DOF, DC motor, Arduino, Motion platform
    So I just put the arms on my motion simulator build and I noticed that they sway from left to right. The short video that I made is too big of a file size to post for some reason so I can’t show you the issue. They are basically the arms that are connected to the motor that push up the whole upper frame and if one motor tilts up more than the other motor then the whole thing sways to the side because of the ball joints on the motor axis. I’m just posting this to see if any of you guys had the same problem and how you fixed it. I’m thinking of just replacing the ball joints at the motor axis with 90° adapters for the bolts but I wanted to check in here before I went out and bought those
  2. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

    Joined:
    Jul 13, 2014
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    Innovative tech specialist for NGOs
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    My Motion Simulator:
    3DOF, DC motor, JRK
    You can use Youtube and then insert the video here,: https://www.xsimulator.net/community/faq/insert-a-video-into-a-post.257/

    The way you describe it sounds like it is ether the fame or the joint the seat is mounted on allowing rotation. If it is the frame it can be reinforced and if it is the joint then there are two options, either use a panhard style rods between the top and bottom frames, to prevent rotation, or swap to a traditional U-Joint, which does not allow rotation.
  3. Sam Neall

    Sam Neall New Member

    Joined:
    May 14, 2019
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    50Coins
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    My Motion Simulator:
    2DOF, DC motor, Arduino, Motion platform
    Ahhh idk how didn’t think of that. I think I’m going to drill a hole through the side of the universal joint and put a pin through it and the structure I slid it into. I attached a picture for context. There is a 3 inch long by 1” wide cylindrical piece of metal that goes down inside the wood in the picture. I think I will drill a hole through the wood and through the metal and just slide a pin there to keep it from rotating. Is attached securely on the seat so I won’t need to do any tweaking there.

    Attached Files:

  4. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

    Joined:
    Jul 13, 2014
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    Occupation:
    Innovative tech specialist for NGOs
    Location:
    St Helens, Tasmania, Australia
    Balance:
    98,890Coins
    Ratings:
    +8,274 / 40 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    You are using a U-Joint, so it won't twist, but I don't get the construction aspects of its mount and the rig that you are trying to describe.

    Can you please add some more photos of the whole rig and how the U-Joint attaches to the base frame and seat.