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first project full frame 2 dof

Discussion in 'DIY Motion Simulator Projects' started by Joeri, Feb 18, 2019.

  1. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    My Motion Simulator:
    3DOF, DC motor, JRK
    There are many factors to consider when designing a motion simulator. Generally the speed needed is a bit subjective and is significantly affected by design choices, but general wisdom suggests between 150-700mm/s http://www.xsimulator.net/community/threads/minimum-rpm-needed-for-a-2dof.7009/

    Keep in mind different designs have different affects on the perceived speed movement of the rig itself. For example the lever linear speed is amplified by the height of the seat back in a compact design.

    And it is not just speed that matters, the rig must have enough power to drive the intend mass, including dealing with inertia.

    Disregarding mechanical loss, to know what Newtons it will take to move something it will be Mass (kg) x Acceleration (m/s) = F (N). So to move 100kg at 0.7 m/s needs 70 N. It takes 9.8N per kg to counteract gravity. Keep in mind there is significant mechanical loss in things like the gearbox, depending on the ratio you may want to allow between 10% to 50% loss for worm gears and the greater the gear ratio the higher the % loss is: http://www.meadinfo.org/2008/11/gear-efficiency-spur-helical-bevel-worm.html
  2. Joeri

    Joeri Member Gold Contributor

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    My Motion Simulator:
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    I know that 200/700 mm/s is ok.

    but I'm getting 1151.920000 mm/s
    that can not be good?

    I want to understand why I get these numbers ;)
  3. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    My Motion Simulator:
    3DOF, DC motor, JRK
    The RPM to Linear Velocity formula is :
    v = r × RPM × 0.10472

    Where:
    v: Linear velocity, in m/s
    r: Radius, in meter
    RPM: Angular velocity, in RPM (Rounds per Minute)


    You can review the maths behind SimCalc: https://www.xsimulator.net/community/threads/simcalc-by-tim-mcguire.11277/page-2#post-140469

    The short real world answer to your question is that the lever CTC is what gives you that figure given the RPM, but the Torque would be inadequate to drive a real world load.
  4. Joeri

    Joeri Member Gold Contributor

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    ok thanks again. Tonight I Will try to understand it with the laptop.

    today connected some wires again.
    it is now plug and play. on the motors and potentiometers


    9CF00DF9-D48A-4936-9A76-812FB59840B7.jpeg
  5. Joeri

    Joeri Member Gold Contributor

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    My Motion Simulator:
    2DOF
    started on the bottom frame.

    7DB9C56F-9513-4DD8-B102-AF77DFD4420F.jpeg 257B1619-555D-46D1-B666-06A69E515F9B.jpeg
    • Like Like x 1
  6. Joeri

    Joeri Member Gold Contributor

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    My Motion Simulator:
    2DOF
    D8DA71D1-CB4A-405E-98E3-9355B6890217.jpeg

    played a bit with smc3 today. with the test motors 12v. I only had to use max limits 145. if I set it to 255. then it goes outside the values and goes off. is that OK ?
  7. hannibal

    hannibal Active Member

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    i like the compartment boxes you are using... do you have a part number / manufacturer... link?
  8. Joeri

    Joeri Member Gold Contributor

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    • Friendly Friendly x 1
  9. hannibal

    hannibal Active Member

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    thank you!!!!!
    • Like Like x 1
  10. Joeri

    Joeri Member Gold Contributor

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    043EFCC7-69AB-4543-8AA1-20FA4F5B0DC5.jpeg
    got the universal joint in today. I think he's a little on the small side. Only 60mm high, hope that is high enough. parts are now coming in slowly.

    Keep u up to date
  11. hannibal

    hannibal Active Member

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    Shiny! Can i ask for link where you bought this?
  12. Joeri

    Joeri Member Gold Contributor

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  13. Joeri

    Joeri Member Gold Contributor

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    Update.

    Got the motors. Still waiting for Some small parts.

    F12A1295-9C3D-4EE9-9E6C-67B7BD47469C.jpeg DF4593C6-AE16-4213-B9E1-215E62A00596.jpeg



    Motor test.

    39043B4F-C3B1-42EB-91ED-B85524C3145A.jpeg 07C2CCC9-3DD4-43FE-9BCC-E686D1466806.jpeg

    Making Some brackets and support for te motors.
    • Like Like x 1
  14. Joeri

    Joeri Member Gold Contributor

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    My Motion Simulator:
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    update

    made 2 cooling fans in the control box:

    IMG_7836.JPG IMG_7837.JPG IMG_7838.JPG IMG_7842.JPG

    strated on connecting the wires:

    IMG_7855.JPG IMG_7856.JPG

    parts:

    image.png

    custom made pot. support:


    IMG_7845.JPG IMG_7846.JPG IMG_7851.JPG IMG_7852.JPG IMG_7853.JPG IMG_7854.JPG

    continue to connect everything tomorrow.
    then i can go to test.

    a local metalworker is making supports that fit on the motor shaft.
    if all goes well I can pick it up on Friday.

    then maybe I can make the play seat move this weekend :)

    Attached Files:

    • Like Like x 2
  15. Joeri

    Joeri Member Gold Contributor

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    Ok everything connected:

    FD1496F6-AF68-4A8C-AD5D-3EA5641BD236.jpeg

    set quickly still needs small tuning:

    2018FE73-C998-47A9-B59E-792A0E35EF43.jpeg

    Simtools set up:

    A6F1FB0D-D414-4E2A-A9A5-D19728CF8452.jpeg

    And a fast run with
    NoLimits Roller Coaster Simulation 2

  16. hannibal

    hannibal Active Member

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    wow.. you are moving fast.

    at the rate i am going, i hope to finish build in 6 months.. :(
    • Like Like x 1
  17. hannibal

    hannibal Active Member

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  18. Joeri

    Joeri Member Gold Contributor

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    it's alive!



    been busy all weekend. and everything works now. I'll post some more info and photos tonight.

    I am very happy with the result. still have to do some fine tuning with sim tools.
  19. Joeri

    Joeri Member Gold Contributor

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    Ok product finished :)

    F7A7A429-2CDA-4457-95ED-F4CC328DCC50.jpeg B860EFA9-F51D-405E-B446-1D51330741A6.jpeg 54D8E7C5-9FB3-441C-A9D1-962971DC85AB.jpeg A6391DE2-74E8-4D94-AEC4-5F3431F05E15.jpeg 7D874E7D-4434-4C04-9B99-C49ED4ECDBF7.jpeg B3E6B245-2F88-43A5-9CC5-C1F3F9689E2F.jpeg
    • Like Like x 1
  20. Joeri

    Joeri Member Gold Contributor

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    My Motion Simulator:
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    Here are Some foto’s of my settings.

    C17170C1-E16F-46B2-8BF6-2644D7868C16.jpeg B060DADE-5CA3-47ED-B340-62771005804D.jpeg 05DBFA63-4442-4279-AD3E-A5478D8BE875.jpeg B051554D-3189-42EF-BC25-CF6BD38CDB70.jpeg

    feels pretty good now. maybe I still have to do some fine tunning. will see if I can make a good video tomorrow.
    • Like Like x 2