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2DOF compact race / flight with Oculus Rift

Discussion in 'DIY Motion Simulator Projects' started by reko19, Jan 9, 2015.

  1. reko19

    reko19 Active Member

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    I agree, from physics standpoint a shoulder mount is a lot easier on the motor. But I think a compact looks so cool. Plus the closer is the motor to the chair pivot point, the less it needs to move to provide the same range of motion for the chair. Any special computer requirements, or any average PC would do?
  2. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    My Motion Simulator:
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    An average PC if fine for the motion simulator.

    The Rift however needs a pretty powerful computer and current generation graphics card to maintain the frames per second that are really needed for a decent experience.

    To give you a bit of an idea I run a water cooled i7, which is a bit of overkill as a good i5 will do the job, 16GB Ram and I am upgrading my graphics card this week from a Nvidia 66o to a Gigabyte GTX 970 G1, which I plan to overclock. At this stage there are Rift issues with SLI so a good single card is best. AMD cards will not work with some games, such as DCS.

    A compact style sim with full frame like mine needs at least 50:1 motors, I went from 25:1 to 60:1. There is more strain on them than a shoulder mount.
  3. reko19

    reko19 Active Member

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    understood, i bought three 50:1, should be good regardless of which way i decide to go
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  4. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    My Motion Simulator:
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    Wise move!
  5. bsft

    bsft

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    not quite, the desk racer mount motors may be close to the pivot, but it requires more effort, not less to move to get similar motion. so yes, 50:1 gearboxes for sure
  6. bsft

    bsft

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    Nicks is a seat mover, Noorbeasts a full frame, my original desk racer is a seat mover.
    What frame where you looking at , full frame or seat mover?
  7. Nick Moxley

    Nick Moxley Well-Known Member

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    My Motion Simulator:
    2DOF, 3DOF, DC motor, JRK
    Theory 1: Side- Lateral G force effect

    Seat Mover motion style

    [​IMG]

    Strong G force simulated by move seat only.
    Realized to simulate neck muscle working by head is going to keep vertical position.





    Real Life

    [​IMG]

    Yellow:G force
    Blue/Red
    :
    muscle tension







    Other motion style


    [​IMG]

    Whole cockpit include monitor move together.
    It feels only poor G force.


    Theory 2: Front Back- Acceleration Deceleration G force effect


    Seatmover motion style



    [​IMG] [​IMG]
    Best and most advanced motion style.






    Others


    [​IMG]

    Not enough G information.
    Improper direction, too much
    and the change of G force on foot .
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    Last edited: Jan 11, 2015
  8. reko19

    reko19 Active Member

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    Here is what i have in mind so far, first draft. I have to start somewhere so I ordered a seat as a starting point, this will drive the rest of the dimensions.
    www.amazon.com/gp/product/B002L1IMLK/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
    Also, to avoid having to shift a u-joint when the controls are changed, I am thinking of leaving my driving controls in place and just adding a joystick on the right / throttle on the left. This takes away from the authentic experience but I think I could live with it.

    Power supplies came in today, one of them looks pretty beat-up.
    Capture.JPG
  9. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    If you plan on having the motors at the back then you really should have a much higher leverage point, such as a shoulder mount. Trying to lift from low on the back is about the least efficient design.

    I suspect what you have as drift will be more like yaw in terms of motion sensation.
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  10. reko19

    reko19 Active Member

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    So something like this, similar to your design? If having motors in the back is the most efficient design I might end up doing something similar to Nick's design.
    Capture.JPG

    Hey Nick, there is a picture on your built thread posted by Prodigy, do you know whose built is that? Looks pretty slick.

    Attached Files:

    Last edited: Jan 12, 2015
  11. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    My Motion Simulator:
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    At the front you want the mout point at least as high as the seat swab, mine is a little higher than that. A shoulder mount like @Nick Moxley's is the most efficient.
  12. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    My Motion Simulator:
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    I have just started doing some comparison tests between seat shaker and full frame modes, as my rig can be either.

    It is certainly true that the amount of perceived motion is greater in seat shaker mode, with exactly the same motion profile. However, full frame is more realistic and I suspect once I have the quasi surge plate sorted to simulate acceleration/deceleration G forces will be superior. By way of example more realistic to me means if you do a loop in Prepar3D with the Rift the full frame maintains immersion, it feels like you are doing a loop, whereas it breaks in seat shaker mode as your feet are stationary in an unnatural manner, even though it produces a perceived greater G force sensation.
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  13. reko19

    reko19 Active Member

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    Noorbeast, I am curious, how do you convert between the two on your rig? Just by placing pedals on the floor instead of having them mounted on the rig itself?
    Last edited: Jan 12, 2015
  14. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    My Motion Simulator:
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    The controller rail easily unbolts, leaving it as a seat shaker, which then has the pedals on the floor. I also alter the adjustable pivot point to suit, so the rig is properly balanced in each mode.
  15. Nick Moxley

    Nick Moxley Well-Known Member

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    My Motion Simulator:
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    might look good but sounds like a Birds nest behind your head, Moves like a waddling duck and is priced like its made from 24k Gold.
  16. Nick Moxley

    Nick Moxley Well-Known Member

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    My Motion Simulator:
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    Pedals on floor would never fly for me, NEED to be bolted down or they go for a ride.
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  17. reko19

    reko19 Active Member

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    so my u-joint came in today, it is a LOT smaller than what I was expecting. I am not concerned that it is strong enough, but is it going to give me a full range of motion? what do you think, pictures are taken on top of the power supply for reference, when it is in the extreme position. it offers more motion in one direction as compared to another.

    IMG_2721.JPG
    IMG_2722.JPG
  18. Nick Moxley

    Nick Moxley Well-Known Member

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    My Motion Simulator:
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    I also thought I would need more angle when i first got the Truck Driveshaft for my 2nd rig i built for buddy. But in reality we are only using a fraction of the travel the Joint can offer.

    How many PSU's did you pick up ? backups or are you doing a 4dof ?
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  19. reko19

    reko19 Active Member

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    eBay seller had 4 at $8 each, I just bought all of them. Planning to do 2DOF possibly with a drift or surge, etc.
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  20. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    As it is not really clear in your drawing just be aware you want the uni joint directly under the seat, not half way between the seat and the base.