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My 2DOF with wheelchair motor

Discussion in 'DIY Motion Simulator Projects' started by Ivan Ilic, Apr 30, 2021.

  1. ZipRacer

    ZipRacer 2dof full frame + seaparte L&R seat mover

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    My Motion Simulator:
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    will post pictures and circuit diagram. am just busy at the moment.
  2. ahoenksiluman

    ahoenksiluman Member

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    have you teardown the gearbox yet..??
    i want to know the rasio of that gearbox...
  3. Ivan Ilic

    Ivan Ilic New Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    Motor gearbox ratio is 1:26, output shaft is 118rpm.
    At the beginning of the previous page you have a picture of the gearbox inside.
  4. ZipRacer

    ZipRacer 2dof full frame + seaparte L&R seat mover

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    Question Ivan. Is the "output shaft'' the one directly/mechanically connected to the original wheelchair wheel? I ask because 118 rpm will translate to 118 wheelchair wheel rotations per minute which is very very fast for a typical wheelchair I suppose.
  5. ZipRacer

    ZipRacer 2dof full frame + seaparte L&R seat mover

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    I saw the picture you referred to on the teardown. Would you happen to know the approximate diameter of the original wheel of the wheelchair? Is it 12 inches diameter or maybe 24 inches? A 12-inch diameter wheel, rotating at 118 rpm top speed would be traveling (at top speed) at approximately 12.6 kilometers per hour, thereabout, assuming my calculations are correct (?).
  6. ZipRacer

    ZipRacer 2dof full frame + seaparte L&R seat mover

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    As promised, will try to send some pictures except I don't know how to do it. Was absent when it was taught ! g27 to chair sway Circuit.jpg Seat Joints  2x front&back.jpg g27 to chair sway Circuit.jpg Seat Joints  2x front&back.jpg wiper drive.jpg

    Attached Files:

    • Like Like x 1
  7. ZipRacer

    ZipRacer 2dof full frame + seaparte L&R seat mover

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    My Motion Simulator:
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    Pls note to add a diode across the relay field coil circuit to protect the optocoupler from reverse current. Sorry I forgat to include those (1 per relay) pls see picture. The Opto should be able to drive a small 12 volt relay for this purpose. The relay is a double pole single throw (dpst) 12 volts type. Any relay capable of passing 3 to 5 amperes on its contacts should work.

    Attached Files:

  8. Ivan Ilic

    Ivan Ilic New Member

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    My Motion Simulator:
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    The wheel is directly connected to the output shaft.
    The wheel was 13 inches, but it says that the speed is 10km / h
  9. Ivan Ilic

    Ivan Ilic New Member

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    Thanks for posting
  10. ZipRacer

    ZipRacer 2dof full frame + seaparte L&R seat mover

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    My Motion Simulator:
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    the numbers are consistent. You have a quick acting linkage at 80 to 118 rpm.
    Good choice of motor and gearing.
    • Agree Agree x 1
  11. ahoenksiluman

    ahoenksiluman Member

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    ow, didnt see that...
    we have the same motor spec, but i use more ratio, but harder to process, your build looks simple and very promising...

    nice post...
  12. Ivan Ilic

    Ivan Ilic New Member

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    My Motion Simulator:
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    Modification from seat mover to whole platform move. Basis:

    Attached Files:

    • Like Like x 1
  13. Ivan Ilic

    Ivan Ilic New Member

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    platform:

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    • Like Like x 1
  14. Ivan Ilic

    Ivan Ilic New Member

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    My Motion Simulator:
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    Shifted center of gravity (picture 3)

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  15. Ivan Ilic

    Ivan Ilic New Member

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    At about 30 seconds and at 2:25 during sudden braking an error occurred because the PWMrev in the SMC3 utility was set low (only 20). I haven't studied well what PWMrev is for :)
  16. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    • Agree Agree x 2
  17. Ivan Ilic

    Ivan Ilic New Member

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    My Motion Simulator:
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    I know, everything is nicely explained when a person reads carefully :)

    Yes, that's right, fine movements are missing. Maybe I put stiffer springs, I wouldn’t remove them completely. Due to the damping of stronger shocks. Anyway, they are easy to remove :)