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Showroom Custom 2DOF full platform

Discussion in 'DIY Motion Simulator Projects' started by Tóth Péter András, May 4, 2023.

  1. Tóth Péter András

    Tóth Péter András TPA

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    My Motion Simulator:
    2DOF, Arduino
    Hi Everyone,
    I'm creating my very first simulator. I've planned with an ESP32 which reads the telemetry data via Wifi, and it's fully compatible with all gaming platforms.
    Used items:
    Power unit: https://www.aliexpress.com/item/1005002728038351.html?gatewayAdapt=4itemAdapt
    ESP32: https://www.aliexpress.com/item/1005004268911484.html
    2 controller: (https://www.aliexpress.com/item/100....order_list.order_list_main.84.21ef1802mmQpxn)
    2 motor: https://www.ebay.com/itm/354052076387

    I've posted some media about the progress :)

    Mock-up:

    First move:

    Motion test:

    Integration test:


    The motor is bit noisy but, I don't know yet the reason... Maybe to much voltage...

    Now everything is working, but it wasn't testet yet with full load. I'm a bit afraid, that, it hasn't enough power to lift and hold :(
    Any ideas or experience? Maybe a magnetic brake?

    Attached Files:

  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
  3. Radje748

    Radje748 Member Gold Contributor

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    My Motion Simulator:
    2DOF
    It would advise to place the middle section more backwards....make sure that the centre of weight is in the middle.... I am afraid that if you put the seat on it, sit on it, the weight is way too much on the back....

    (I made the same mistake, which costed me some rebuild time ;) )
  4. Tóth Péter András

    Tóth Péter András TPA

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    My Motion Simulator:
    2DOF, Arduino
    Before the assembly I attached the seat to the upper frame, to calc the axis of rotation. The center can be moved easily forward and backward. So I'm not worry about the mid point. The motor is also moveable. I placed the motor as back as possible to reduce the load of the motor (maybe there is my mistake, as you mentioned). In my understanding moving far the motor reduces the load and the responsiveness. My concern is that I can rotate the motor by hand with few effort...
  5. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    How long is the motor lever Center to Center?
  6. Tóth Péter András

    Tóth Péter András TPA

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    My Motion Simulator:
    2DOF, Arduino
    50 cm to the arm and 12 cm between the arm and the motor.
    PWM noise sound normal then?
  7. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Depending on hardware a higher frequency can push PWM noise beyond hearing range: https://www.xsimulator.net/communit...-motors-while-not-moving-check-this-out.6697/
    That is not clear to me, the CTC is the measurement from the motor shaft center along the lever to the center of the hole the rod bolts to, so what is the CTC?
    Képernyőfotó 2023-05-04 - 9.28.53.png
  8. Tóth Péter András

    Tóth Péter András TPA

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    My Motion Simulator:
    2DOF, Arduino
  9. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Run that and the rest of your rig dimensions through SimCalc, as that CTC may be pushing it a bit too far.
  10. Tóth Péter András

    Tóth Péter András TPA

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    My Motion Simulator:
    2DOF, Arduino
    Sim calc says 120mm, 50Nm, 75rpm, Max angle 20, Current angle: 10:
    Linear speed: 928 mm/s
    Output force: 410 N
    Linear travel: 82mm
  11. Gadget999

    Gadget999 Well-Known Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino, 6DOF
    What type of projector do you use ?

    How is the image compared to a screen ?
  12. Tóth Péter András

    Tóth Péter András TPA

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    I think the noise is gone with the correct frequency :) Thank you @noorbeast !
    Is the 400 N enough, or should I use shorter CTC?
    @Gadget999 it's a 3d DLP Benq projector and I never would go back to a monitor :) The real size give a much more realistic feeling.
  13. Gadget999

    Gadget999 Well-Known Member

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    Which model is it or do you recommend ?
  14. Tóth Péter András

    Tóth Péter András TPA

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    My Motion Simulator:
    2DOF, Arduino
    Benq th681 plus. But if you don't need a 3d edition the normal th681 is fine
  15. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    I believe you likely have way to much speed and not enough torque, so yes decrease the CTC, you can have a number of holes for actual experimentation. But first run a CTC around 70mm in SimCalc and see what N you get.
  16. Tóth Péter András

    Tóth Péter András TPA

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    My Motion Simulator:
    2DOF, Arduino
    With 700mm CTC
    Speed: 541mm/s
    Force: 700N
    Travel: 47mm
  17. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    I suggested 70mm, not 700mm.
  18. Tóth Péter András

    Tóth Péter András TPA

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    You are right, my mistake, they were calculated with 70mm
  19. Tóth Péter András

    Tóth Péter András TPA

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    My Motion Simulator:
    2DOF, Arduino

    Attached Files:

  20. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Just another suggestion, given the design the CTC rest angle would be 0 degrees (parallel to the ground and top frame) rather than 45 degrees.