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Question 3 DOF Seat mover concept stage

Discussion in 'DIY Motion Simulator Projects' started by 3DSensory, Apr 20, 2020.

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  1. 3DSensory

    3DSensory New Member

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    Hi all

    I’d like to build my own sim. It would mainly be a car racing sim, but I’d like it to be modestly capable as a flight sim to.

    My idea is for a seat mover design like the CXC but with an extra actuator on the front to give three axes of movement. See below

    First of all, I’m seeking feedback on this general concept before proceeding to build a scale model.

    I'm unsure of the actuator types, I've drawn two linear actuators on the back like the CXC and a lever type actuator on the front. Is it possible to mix the two types?

    Thanks for your feedback, big or small, as to whether this is a design worth pursuing.


    upload_2020-4-20_20-34-42.png
    3DSensory, Apr 20, 2020
    #1
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    How will it maintain equal movement geometry between the front and rear actuators?
    noorbeast, Apr 20, 2020
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  3. 3DSensory

    3DSensory New Member

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    Hi Noorbeast, thanks for your question, It's a good one and honestly I'm not sure!

    Could the software handle this? using ratios of lever arms and such
    3DSensory, Apr 20, 2020
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  4. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    I guess you could play around with axis limiting to try have a somewhat even actuator range, or restrict the front axis to just surge and pitch, but it would be better to design it as a traditional 3DOF in the first place.
    noorbeast, Apr 20, 2020
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  5. 3DSensory

    3DSensory New Member

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    Okay so by the sounds of it mounting the actuators up high like the CXC wouldnt really give any advantage in this case because I'd have to dial them down to match the front actuator, hence a traditional 3 dof design would be better?
    3DSensory, Apr 21, 2020
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  6. 3DSensory

    3DSensory New Member

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    I see, so having the additional mass of the seat unsupported in this design effectively cancels out the mechanical advantage of the mounting up high.

    How about shifting the 3rd actuator position back to where the uni balance point would usually be located? In this case the full weight of the seat is supported by the 3rd actuator, therefore providing full mechanical advantage to the two actuators mounted high on the seat, yet maintaining vertical axis movement. In my mind vertical axis movement seems like it is important to a flight sim, is that actually the case?

    If this idea also doesn't stack up, i'd be split between a traditional 3DOF and a CXC style 2DOF. Which would give the best compromise for a 3/4 car sim 1/4 flight sim?
    3DSensory, Apr 22, 2020
    #6