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My 6DOF Motion sim

Discussion in 'DIY Motion Simulator Projects' started by Genociple, Sep 2, 2024.

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  1. Genociple

    Genociple New Member

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    I am not an engineer whatsoever, yet im currently working on my associates then towards a mechanical engineering degree. Please forgive my crappy terminology and mixup of names of things.

    So far i have a 6DOF stewart platform made from hobby servos using an ESP32 dev board and FlyPT software



    I also have a rig in process of being built(based off of Next level racing F-Gt Elite)

    Crappy cad model of full scale stewart platform

    next up is motors. Still at a loss of what to do for cheapest motor setup for moving 150kg(me and rig)(total is less than that but using that as a benchmark)
    • Like Like x 1
    Genociple, Sep 2, 2024
    #1
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Any 6DOF is an ambitious first project. So doing some research before getting in too deep is time well spent, as is building a working model, as you have done :thumbs

    Bounce your full size plans and shopping list off members before jumping too far down what can be an expensive rabbit hole, if you get it wrong. Following in the footsteps of others will likely save some time, frustration and money.

    AASD15A servos are currently the most popular high powered option for these types of rigs, be they rotary or actuator designs, and there are a number of existing hardware controllers that almost make them plug and play, just make sure you check with members in your bulid thread and controller developers like @Thanos before ordering, to make sure you have the correct and properly shielded servos, if you go down this well defined pathway: https://www.xsimulator.net/community/faq/amc-aasd15a-servo-controller.351/
    noorbeast, Sep 2, 2024
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  3. Genociple

    Genociple New Member

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    Genociple, Sep 2, 2024
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  4. Genociple

    Genociple New Member

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    Here is my cad model for my rig, made with 5050 aluminum extrusion and 1/4 aluminum for the brackets
    very adjustable, from my real car seating position all the way to f1 position.
    upload_2024-9-1_20-7-5.png
    • Like Like x 1
    Genociple, Sep 2, 2024
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  5. Genociple

    Genociple New Member

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    Also another thing to consider, i live in an apartment, i have 15-20 amps to work with so what motors would be recommended, possibly something i can find in a junkyard maybe? treadmills, washer/dryer? idk.
    Genociple, Sep 2, 2024
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  6. Genociple

    Genociple New Member

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    I also saw a tutorial using those hover board motors to make a sim wheel, could i use 6 or 12 of those for 150kg moving
    Genociple, Sep 2, 2024
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  7. Genociple

    Genociple New Member

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    My rig rough draft dimensions are as follows:

    1200mm base
    600mm platform
    500mm height
    upload_2024-9-1_21-41-5.png
    Genociple, Sep 2, 2024
    #7
  8. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Keep in mind that not only is a load not evenly distributed on a motion rig, the fast moving mass also has significant inertia.

    Cheap junkyard motors are not likely to cut it and the complexity and associated cost of multiple controllers for say powerful 12/24v motors is a serious consideration. Odrive motors are a possibility and have been used before, but the control side can be finicky to sort and get running reliably.
    noorbeast, Sep 2, 2024
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  9. Genociple

    Genociple New Member

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    odrive motor or odrive controller? im not sure that im able to find odrive motors
    Genociple, Sep 2, 2024
    #9
  10. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    noorbeast, Sep 2, 2024
    #10
  11. Genociple

    Genociple New Member

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    After looking at it a bit, ive found a robodog example using odrive, hoverboard motors, and absolute hall sensors.

    im using that leg force excel with the rough draft dimensions and each leg will have 300N resting force and 600N at 1G heave acceleration.

    if at a crank arm of 100mm that 30-60Nm of torque. I would need 1:5 reduction to be able to use the 13Nm hoverboard motor. since its only 1:5 i was thinking of a capstan reduction drive(would be minimal backlash too)
    Genociple, Sep 2, 2024
    #11