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6 DOF Flight Sim Rig

Discussion in 'DIY Motion Simulator Projects' started by Diving Delica, Sep 30, 2019.

  1. Diving Delica

    Diving Delica New Member

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    Hi All,
    I to have started the journey, First time builder, long time sim flyer.
    I got very lucky and bought actuators from a member with all electronic to go with them.
    So all to do now is build aluminium frames and assemble......Hopefully.
    24volt Actuators
    • Like Like x 2
  2. Ads Master

    Ads Master

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  3. Diving Delica

    Diving Delica New Member

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    My Motion Simulator:
    6DOF
    Also have trouble working out the correct size for the base and top platform.
    I've done some autoCad drawings but it seems so big, does anyone have comment on the size difference between top and bottom platforms??
  4. hannibal

    hannibal Active Member

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  5. Diving Delica

    Diving Delica New Member

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    • Like Like x 1
  6. pmvcda

    pmvcda aka FlyPT

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    My Motion Simulator:
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    They are,
    But verify the dimensions, I made it to be the most compact possible.
    You might want it larger. (easier to enter/exit)
  7. hannibal

    hannibal Active Member

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    ideally, yes..
    but after all you make it how it suits yiur build.

    ive learned that the design follows the circle.. and triangles 30 , 60, 120 degreees
    • Agree Agree x 1
  8. pmvcda

    pmvcda aka FlyPT

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    Another note,
    The actuators size are one of the most important factors here,
    And an ideal hexapod, to have the largest dof in all 6 dof, would be a simetrical one:
    Same size top and bottom
    Same point where actuators touch each other (same joint would be great, but I don't see how)
    And equally spaced 360°/3=120°
    • Informative Informative x 2
  9. Diving Delica

    Diving Delica New Member

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    Hi pmvcda
    Thanks for the information
    I'm completing a Cad draw of the actuators that i have, mine appear to longer than yours, so not too sure on what the % increase in platform size would be to cater for that
  10. hannibal

    hannibal Active Member

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    you have to becareful what you increase, or else the actuators pivot beyond structural limits....
  11. Diving Delica

    Diving Delica New Member

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    My Motion Simulator:
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    IMG_1725.jpg So today began the aluminium base frame, cut and tack tig welded.
    Getting excited now.
    Tomorrow the upper frame
    • Like Like x 6
  12. Dirty

    Dirty Active Member Gold Contributor

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    Nice aluminum frame! :thumbs

    I'm trying to find someone in southern germany able to do aluminum welding for a reasonable price, but so far no joy :-(

    Intuitively, I agree! Unfortunately I have very few rational arguments for/against that. Depending on the actuator length this would be a quasi-regular octahedron. If anyone knows any mathematical papers on the topic, i'd appreciate.

    Cheers,... Dirty :)
  13. hannibal

    hannibal Active Member

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    i made my bottom frame out of wood. but will be using steel for the top frame.
    looking forward to see your top frame, your bottom frame looking very nice!
  14. Diving Delica

    Diving Delica New Member

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    Hi guys. Why is it work takes up so much time, still trying to get to the top frame. I think I might be 100-150mm to long on the long edges of the base frame but not sure. Think I'll just continue and shorten later
  15. Diving Delica

    Diving Delica New Member

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    My Motion Simulator:
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    So after way to much work, this week I will have a top frame completed this weekend, photos to follow
    • Like Like x 1
  16. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    DC motor, Motion platform, 6DOF
    Unless your going to attach it to the floor somehow, I would always make the base out of steel so it has some weight/stability. Even with a steel base (although not that heavy) + 6 Actuators/capsule, my old 6DOF stewart platform use to often lift itself off the floor and travel. But it is of course always good to keep the top frame as light as you can.
  17. Diving Delica

    Diving Delica New Member

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    Hi seat time, I figured with my body weight would be enough to keep it down. At 100kg
  18. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
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    What happens is that 100 kg turns into 100kgs + of inertia when the rig is moving fast. Just something to keep in mind and for anyone else building a 6DOF base that there is no need to go to the trouble of building it light.
    • Agree Agree x 1
  19. Pierre Lalancette

    Pierre Lalancette Sir Lalancelot Gold Contributor

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    Seatime is right. It is a good thing to keep the platform light (because of inertia), but the base is better to to be heavy and stable. Your weight won't keep it down. Exactly the opposite. 100 kgs trowed in a direction has a great potential to bring many things with it, like a light base.

    I don't remember what make me choose the size of my base, but for the platform, it was the length of a carbon tube (1 m) so I didn't have to cut it.
    • Like Like x 1
  20. Diving Delica

    Diving Delica New Member

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    Thanks guys, didn't think of it that way. So now the choice, diet or fab a steel base? Then steel base it is....lol
    I think for testing I'll stay with the Ali base until I decide the exact diemensions and then just fab it up.
    • Like Like x 1
  21. Diving Delica

    Diving Delica New Member

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    Hi Brains trust, what are your thoughts on seat position in the top frame? Should I be positioning it in the centre of the triangle? Or further back to take into account the weight of my legs and foot peddles?