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2 dof seat mover with cv

Discussion in 'DIY Motion Simulator Projects' started by Raredog, May 31, 2016.

  1. Raredog

    Raredog Active Member

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    Hi

    After following you guys for the last year or so, I have finally gathered the parts needed to build a sim :)

    I will start out with a 2 dof seat mover and see where it ends, but there is one thing that I can't really find the answer for: why not use a cv joint?
    I have tried mounting it to a plate and for me it looks like it is moving in just the same way as a u-joint. Being from Denmark where most cars are fwd,it is way easier to find a cv.

    Anyone?
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    Many CV joint allow lateral rotation and if used require additional panhard style control rods to prevent unwanted twist of the motion sim. A uni joint prevents lateral twist so is a far simpler solution.

    It is worth hunting around and finding an old car to get the tailshaft and uni joint, just cut it to the suitable length, mounting the uni joint as close to the seat base as possible.
    • Agree Agree x 3
  3. Daguru

    Daguru Rally drivers do it in the Dirt

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    From what have read a cv will work ok but you can have a small amount of twist in your motion and u might need to address that if you want the best feel.

    Edit @noorbeast beat me to it lol
  4. Raredog

    Raredog Active Member

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    Aah, thanks :)

    I have tried twisting it, but there doesn't seem to be any rotation, but maybe it will show up when mounted?
  5. chu

    chu 2dof racingseat

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    there are Cv joints that doesn´t twist but if It does you can put one or two edge rod like in the picture and solved 2wnw9ps.jpg
  6. chu

    chu 2dof racingseat

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    Is not a bad idea using a CV joint I found them more reliable and durable than the cardan joints.
  7. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    I have never heard of a car tailshaft cardan joint ever failing or wearing out on a motion sim, so what leads you to believe they are not as durable as a CV joint?
    • Agree Agree x 2
  8. chu

    chu 2dof racingseat

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    The Cv joints are used for traccion and the cardan usually for steering, the forces for they where designed to are higher.
  9. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    I recommended a cardan from a car tailshaft, not a steering column. Those will never fail on a motion sim and greatly simplify the construction, as no panhard style rods are needed.
    • Agree Agree x 2
    • Like Like x 1
  10. Raredog

    Raredog Active Member

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    Ill try and let you know if its ok :)

    How much difference does it make with a single turn pot directly on the axle, vs a geared pot? I like to make it as simple as possible, as it is my first sim :)
  11. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    • Like Like x 1
  12. Raredog

    Raredog Active Member

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    That's smart :) already ordered regular 5k because they are cheap, but then I might want to change them later, if it makes a big difference?
  13. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    I consider the benefits of Hall sensors are worth the cost.

    You can direct mount using a flexible coupling, they are cheap and come in various sizes.

    [​IMG]
  14. chu

    chu 2dof racingseat

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    I have a doubt about flexible coupling. that flexiblity doesn´t interfere in the precision of the movement?
  15. chu

    chu 2dof racingseat

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    I mean, it isn´t better something like this? or is there another advantage i didn´t know on flexible couples? rigid.jpg
  16. chu

    chu 2dof racingseat

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    Agree about the hall sensors easy to build, cheap and durables
  17. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    Do not use a solid coupling, the slightest misalignment can cause damage. A Flexible coupling maintains precise movement and also provides misalignment protection.
    • Like Like x 1
    • Agree Agree x 1
  18. Raredog

    Raredog Active Member

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    Thanks, I think I will use a piece of rubber hose as a coupler :)

    Cool to diy halls :)
    • Like Like x 1
  19. Nick Moxley

    Nick Moxley Well-Known Member

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    a piece of hose is NOT a flex coupler. a hose can actually build up some "twist" as the motor's move and overshoot its position every time. (Not suggested)


    Flex couplers are a couple bucks a piece. (when you search)...I Highly suggest buying the right parts once VS buying thing's twice you "think" will work.

    http://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20160601060611&SearchText=flex+coupler
    • Like Like x 1
  20. chu

    chu 2dof racingseat

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    And I don´t believe a rubber hose could support the strength of the motors working with high weigth(with any weigth, really think so). The guys on the forum really knows what they´re talking about, better to follow their advices, I know by my own...