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My 6 DOF project with BLDC motors

Discussion in 'DIY Motion Simulator Projects' started by Carelsbergh_Stijn, Jan 13, 2019.

  1. pmvcda

    pmvcda aka FlyPT

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    My Motion Simulator:
    6DOF
    Sorry, I don't understand.
    It doesn't move? Nothing?
    Do you see the 3D view moving?
  2. Carelsbergh_Stijn

    Carelsbergh_Stijn Member

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    My Motion Simulator:
    DC motor, Arduino, Motion platform, 6DOF
    Yes, the 3D model moves, but I tought that when you were driving across a long straight road, it would slowly return to its Original position to get redy for a next turn in the course, but it doe't seem to do that, does it have something to do with filters?

    Cheers
  3. pmvcda

    pmvcda aka FlyPT

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    My Motion Simulator:
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    Yes.
    Just for starting, you need to filter yaw.
    Use the last filter on the list. LP(LP(HP)).
    And set the left value to 40 and right one to 300.
    This is just for starting, you have to adjust them. They are new and I have not much experience with the recommended values.
    Those are the number of samples used to filter the signal for low pass and high pass.
    You can enable the graphic just for yaw and adjust the filter so the movement fit's your rig.
    Also don't forget to check rollover (should be by default).

    If you see the rig go out of range, for a fast adjustment, you can check the auto range on the actuators.
    This lowers gain automatically, each time the rig goes out of range.
    Uncheck later, or a simple crash makes the gain lower and lower and become completely unusable. Zero movement.

    Sorry for fast reply, but it's late here, need some sleep....
  4. Carelsbergh_Stijn

    Carelsbergh_Stijn Member

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    My Motion Simulator:
    DC motor, Arduino, Motion platform, 6DOF
    I don't really get what you are saying, maybe it's simpler to send some pictures tomorrow? I will wait for your reply.

    Thanks for enerything!

    Cheers
  5. Carelsbergh_Stijn

    Carelsbergh_Stijn Member

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    My Motion Simulator:
    DC motor, Arduino, Motion platform, 6DOF
    @pmvcda

    Can you please send a screenshot of the filter configuration please?

    Cheers

    Carelsbergh Stijn
  6. pmvcda

    pmvcda aka FlyPT

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    My Motion Simulator:
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    s
    Sorry, forgot o send it to you. Give me 1h...
    I will post in the FlyPT interface thread.
  7. Carelsbergh_Stijn

    Carelsbergh_Stijn Member

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    DC motor, Arduino, Motion platform, 6DOF
    • Like Like x 3
  8. Carelsbergh_Stijn

    Carelsbergh_Stijn Member

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    My Motion Simulator:
    DC motor, Arduino, Motion platform, 6DOF
    Hi guys here is another video



    Hope you liked my project

    Subscribe to see my upcoming projects

    Cheers
    • Like Like x 5
    • Friendly Friendly x 1
  9. kunkurus

    kunkurus New Member

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    Hello,
    What do you use to control your BLDC motors (forward-reverse)?
    Thank you!
  10. hannibal

    hannibal Active Member

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    My Motion Simulator:
    3DOF, 6DOF
    looking amazingggg
    i have one question.. what is the angle that you make the chair frame?
    New Bitmap Image.jpg New Bitmap Image.jpg
  11. Carelsbergh_Stijn

    Carelsbergh_Stijn Member

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    My Motion Simulator:
    DC motor, Arduino, Motion platform, 6DOF
    Hi, I'm using 3 ODrive v3.6 56V motor controllers from ODrive robotics.

    Cheers

    Carelsbergh Stijn
  12. Carelsbergh_Stijn

    Carelsbergh_Stijn Member

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    My Motion Simulator:
    DC motor, Arduino, Motion platform, 6DOF
    The tubes are bend 120°, first I wanted to do the same angle as my chair (±100°) but I knew that the more you bend the tube the worst the bend looks so I dicided to do it 120° because this also caused the bend to be close to the frame which looks kinda cool.

    Cheers

    Carelsbergh Stijn
    • Informative Informative x 1
  13. hannibal

    hannibal Active Member

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    My Motion Simulator:
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    nice! i liked the way your sunken frame looks.
    what kind of tube material did you use?
  14. Carelsbergh_Stijn

    Carelsbergh_Stijn Member

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    My Motion Simulator:
    DC motor, Arduino, Motion platform, 6DOF
    Hi, the 'sunken' frame is because its now rotating around it's center of gravity so the motors are being less stressed. I used steel tubes ±∅35mm and a wall thinckness of ±3mm.

    Cheers

    Carelsbergh Stijn
    • Informative Informative x 1
  15. sagrada737

    sagrada737 New Member

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    My Motion Simulator:
    AC motor, Motion platform, 6DOF
    Guten Tag Carelsbergh,

    Very nice project. I really appreciate the machining and welding you are doing with the motion platform and seat structure. Very nice work!
    Especially interesting is the use of "universal joints" for your actuators. Are these used on one end of the Actuator, with a Rod End on the other end?

    Mike
  16. Carelsbergh_Stijn

    Carelsbergh_Stijn Member

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    Hi

    I'm using them on top and bottom. ∅28mm just like the stainless steel tube.

    Cheers

    Carelsbergh Stijn



  17. sagrada737

    sagrada737 New Member

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    My Motion Simulator:
    AC motor, Motion platform, 6DOF
    Hello Carelsbergh,

    Thank you for the comments on the universal joints for your project. I see now that you are using a Linear Actuator, so it makes sense to use such a coupling.

    Question: How much "noise" does the linear actuator make? I assume that it is Servo driven.

    Regards,
    Mike
  18. hexpod

    hexpod http://heXpod.xyz

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    My Motion Simulator:
    DC motor, 6DOF
    For high displacement platforms some users are using special bearing u-joints with 360 rotation ability.

    https://www.xsimulator.net/communit...l-joints-for-6dof-platform.13420/#post-180550

    Regards
  19. sagrada737

    sagrada737 New Member

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    My Motion Simulator:
    AC motor, Motion platform, 6DOF
    Those are some very nice looking universal joints! If you don't mind sharing... Where did you purchase these? What are the mechanical specs?
  20. hexpod

    hexpod http://heXpod.xyz

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    I would ask @Psionic001 in his thread.