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Lesson My 2DOF project

Discussion in 'DIY Motion Simulator Projects' started by thanh tin, Aug 25, 2020.

  1. thanh tin

    thanh tin New Member

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    My Motion Simulator:
    2DOF
    Hi everybody.First I apologize for my lack of English, I will write the content in my language and then use google translate to convey the content to you guys.
    I come from Vietnam, I would like to introduce you to a small project that I am working on. From the beginning when I saw the video clip of members on the website www.xsimulator.net posted on youtube, I found it very attractive and very lively.
    And I got to work on my little project to see what I could do
    have had small trials and relatively satisfactory results
    then tried to complete my project, however there were some problems but I consulted the posts on the forum and it was solved.
    There are still a few places where the activity is not working properly, I hope to see you and further support.
    Thank you very much, the forum is wonderful

    Attached Files:

    • Like Like x 1
  2. Ads Master

    Ads Master

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  3. thanh tin

    thanh tin New Member

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    My Motion Simulator:
    2DOF
    parts in the project:
    1 Arduino UNO
    1 monster motor shield
    2 motors 775
    However, due to not cooling properly, the monster motor shield has burned

    I changed the model, replaced it with H-Bridges
    After studying on the forum, I also gradually built a model for my project

    Attached Files:

    • Like Like x 2
  4. thanh tin

    thanh tin New Member

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    My Motion Simulator:
    2DOF
    model test by SMC3


    • Like Like x 2
  5. thanh tin

    thanh tin New Member

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    My Motion Simulator:
    2DOF
    please help me
    the left motor sometimes stops and does not move (video clips at 00:24 and 1:04)
    I don't know if the pot moves too much
  6. thanh tin

    thanh tin New Member

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    My Motion Simulator:
    2DOF
    the same goes for the right motor (clip 00:10)
  7. thanh tin

    thanh tin New Member

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    My Motion Simulator:
    2DOF
    and the parameters in SMC3, it seems that the PWMmax is too high

    Attached Files:

  8. Skuldi

    Skuldi New Member

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    My Motion Simulator:
    2DOF, Arduino
    your last 2 videos are private. we can´t see them.
    my first move would be lowering kp a lot.
    • Agree Agree x 1
  9. thanh tin

    thanh tin New Member

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    My Motion Simulator:
    2DOF
    Sorry everyone, I have edited the video clip, hope you all help me

  10. thanh tin

    thanh tin New Member

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    My Motion Simulator:
    2DOF
    thank so much
  11. thanh tin

    thanh tin New Member

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    My Motion Simulator:
    2DOF
    I will review my Kp
  12. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    Innovative tech specialist for NGOs
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    113,980Coins
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    +9,133 / 46 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    Please post pictures of all of your settings, as it looks like the range is too great and the motors are overshooting the limits.

    Just some design related observations for you to consider.

    A lever provides maximum torque when parallel to the seat with the rod at 90 degrees, anything over 38-40 degrees up or down from there is very inefficient use of torque.

    For a relatively compact design torque is more important than speed, and I suspect you lever CTC length is likely too long for what look to be wiper motors, which aren't particularly powerful.
    Last edited: Sep 9, 2020
  13. thanh tin

    thanh tin New Member

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    My Motion Simulator:
    2DOF
    thank noorbeast for your help
  14. thanh tin

    thanh tin New Member

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    My Motion Simulator:
    2DOF
    some info in my simtools
    upload_2020-9-9_16-27-56.png

    upload_2020-9-9_16-28-46.png
  15. thanh tin

    thanh tin New Member

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    My Motion Simulator:
    2DOF
    with SMC3

    Attached Files:

  16. thanh tin

    thanh tin New Member

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    My Motion Simulator:
    2DOF
    My english is not good, everyone understands
    thanks noorbeast for helping me
    with this content I do not understand how noorbeast can speak clearly
    "A lever provides maximum torque when parallel to the seat with the rod at 90 degrees, anything over 38-40 degrees up or down from there is very inefficient use of torque.

    For a relatively compact design torque is more important than speed, and I suspect you lever CTC length is likely too long for what look to be wiper motors, which aren't particularly powerful."
  17. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Think of an example like pushing a door, at 90 degrees to the door you can easily push it with your little finger using little force, but at an acute angle a lot of force is needed for little result.

    In addition the greater the Center To Center distance used on a lever the greater the linear speed, but the less the torque.

    The smaller the distance between the pivot point and the motor placement the greater the torque needed to drive a rig.

    Probably the easiest way to play with design Vs physics trade offs is with SimCalc: https://www.xsimulator.net/communit...e-linear-speed-and-forces-of-your-design.270/
  18. thanh tin

    thanh tin New Member

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    My Motion Simulator:
    2DOF
    thanks very much noorbeast for your enthusiasm
    I have viewed many other projects and have all seen your help in them
  19. thanh tin

    thanh tin New Member

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    My Motion Simulator:
    2DOF
    In your opinion, I should shorten the CTC to increase torque

    Attached Files:

  20. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
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    Innovative tech specialist for NGOs
    Location:
    St Helens, Tasmania, Australia
    Balance:
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    +9,133 / 46 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    Yes, I suspect the CTC is likely way too big for such small motors with the mass of a full frame rig. Have you tried it under load for an extended period of time yet, that is the real acid test?
  21. thanh tin

    thanh tin New Member

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    My Motion Simulator:
    2DOF
    thank very much noorbeast