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Racing 6DOF stewart platform

Discussion in 'DIY Motion Simulator Projects' started by Gadget999, Feb 15, 2019.

  1. Gadget999

    Gadget999 Well-Known Member

    Joined:
    Dec 27, 2015
    Messages:
    1,911
    Location:
    London
    Balance:
    11,694Coins
    Ratings:
    +460 / 9 / -0
    My Motion Simulator:
    2DOF, DC motor, Arduino, 6DOF
    the two batteries I use are

    12v
    44Ah
    and 420 cranking amps

    kept topped up with a 25A 24v power supply

    https://batterygroup.co.uk/Batterie...XAunvhi-OBWOS_BRcV-4ZqjBu4Qe2JlBoCxWAQAvD_BwE
  2. luu trung

    luu trung Member

    Joined:
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    156Coins
    Ratings:
    +7 / 0 / -0
    My Motion Simulator:
    3DOF
    What is the difference between 1800 rpm and 3000 rpm engine and 135 rpm and 75 rpm gearbox?
  3. Gadget999

    Gadget999 Well-Known Member

    Joined:
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    My Motion Simulator:
    2DOF, DC motor, Arduino, 6DOF
    some motors have different max rpms

    the output shaft from the gearbox can have different ratios

    the slower the rpm, the slower the speed of the actuator will be

    however - the gearbox ratio will affect how much torque the output has

    choose the most powerful motor you can get and a gearbox ratio between 50:1 and 30:1
  4. Gadget999

    Gadget999 Well-Known Member

    Joined:
    Dec 27, 2015
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    Location:
    London
    Balance:
    11,694Coins
    Ratings:
    +460 / 9 / -0
    My Motion Simulator:
    2DOF, DC motor, Arduino, 6DOF
    I have done some work on the air bags to create a sustained G affect

    its a pnematic cylinder I had laying about that acts in both directions - I will connect it to an actutator soon and get simtools to drive it

    https://www.youtube.com/shorts/6pARdaAAItE
  5. Gadget999

    Gadget999 Well-Known Member

    Joined:
    Dec 27, 2015
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    London
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    Ratings:
    +460 / 9 / -0
    My Motion Simulator:
    2DOF, DC motor, Arduino, 6DOF
    another video of the airbag pump

    its basically an arduino nano running SMC3 software and a wheelchair motor and gearbox

    it uses a lot more current than I expected - the air resists being forced up the small diameter tubes - the big motor does the job forcing the air where it needs to be, a very fast response

    you can feel small changes in the force change as the car looses grip - quite a useful addition and adds another feedback to the senses of the driver.

    • Like Like x 2
  6. Gadget999

    Gadget999 Well-Known Member

    Joined:
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    My Motion Simulator:
    2DOF, DC motor, Arduino, 6DOF
    Over time it appears the bags are pumping up and becoming firmer.

    The piston seal in the cylinder seems to leak a tiny bit sucking in air on the backstroke.

    Simple solution was to fit 2x small pressure relief valves so any pressure above a few psi is blown off

    Seems to work really well and ensures the air bags can't be overinflated
    • Informative Informative x 1
  7. Rodrigomarcos1978

    Rodrigomarcos1978 New Member

    Joined:
    May 13, 2022
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    116Coins
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    +13 / 0 / -0
    My Motion Simulator:
    2DOF
    hello.. I'm on my 10th project here with motions in Brazil, where I live. I decided to start a new project with wheelchair motors, but it didn't work out initially because the IBT2 bridges didn't support it.. So I found your post here and bought two of those 100A bridges, one for each motor.. However, I don't have the electrical schematic for connecting the Arduino to this 100A H bridge and I didn't quite understand the correspondence between the terminals... Could you share the wiring diagram you used? thanks !!
  8. Gadget999

    Gadget999 Well-Known Member

    Joined:
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    My Motion Simulator:
    2DOF, DC motor, Arduino, 6DOF
    If i remember correctly It uses a pwm pin and 2 direction pins
  9. absyfadhel1

    absyfadhel1 Member

    Joined:
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    My Motion Simulator:
    2DOF, Arduino
  10. Gadget999

    Gadget999 Well-Known Member

    Joined:
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    My Motion Simulator:
    2DOF, DC motor, Arduino, 6DOF
    the motor driver has a positive and a negative connection - the battery connects there
  11. absyfadhel1

    absyfadhel1 Member

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    My Motion Simulator:
    2DOF, Arduino
    so the power positive and negative come from psu to battery , and from battery to motor controller?
  12. Gadget999

    Gadget999 Well-Known Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino, 6DOF
    No

    Wire the battery to the motor controller

    Then attach wires from the power supply to the battery - just like a battery charger
  13. absyfadhel1

    absyfadhel1 Member

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    My Motion Simulator:
    2DOF, Arduino
    oh ok Thanks alot bro.