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How to figure out where to mount 2DOF on full motion rig?

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by rkbaseball, Jan 30, 2020.

  1. rkbaseball

    rkbaseball New Member

    Jan 21, 2020
    +2 / 0 / -0
    My Motion Simulator:
    Hey all,

    I am trying to build a 2DOF system to add to my rig. I am almost done bench testing the motors, and trying to figure out where I should mount it. I am currently running an old Formula chassis I converted into a simulator. Therefore, I need to move the whole rig, not just the seat (seat is fixed to the chassis). I have 3 options for mounting.
    1: I can mount underneath the floor of the chassis in either the rear or front (benefits of front? I've heard it feels like motion from your knees?)
    2: I can mount from the engine mounts (or suspension mounts) at the rear of the chassis. These are about halfway up the seat height, and sit about 2-3 feet off the ground.
    3: I can weld tabs onto the roll hoop and mount higher in the car for a more "shoulder" mount.

    From the research I have done, many people seem to prefer the shoulder mount, but I cannot figure out why? The easiest route is probably either engine mounts or just directly mounted to the bottom of the chassis.

    Thanks a ton for any insight!
  2. Ads Master

    Ads Master

    +0 / 0 / -0
  3. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

    Jul 13, 2014
    Innovative tech specialist for NGOs
    St Helens, Tasmania, Australia
    +8,685 / 42 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    See the FAQs here re Seat Shaker Vs Full Frame designs, the short answer is that a Seat Shaker generates some additional motion cues at the wrists and ankles and has less mass to move and less inertia to manage, but it is really a question of personal preference: https://www.xsimulator.net/community/faq/full-frame-vs-seat-shaker-designs-which-is-better.213/

    What is important is that for either the rig must be properly balanced: https://www.xsimulator.net/communit...-of-gravity-to-balance-a-motion-simulator.55/

    Sounds like you have a lot of mass to move so it would likely be a good idea to maximise inherent design leverage.