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2DOF low cost motion platform for Rfactor 2 and GP Bikes

Discussion in 'DIY Motion Simulator Projects' started by poumpouny, Nov 27, 2023.

  1. poumpouny

    poumpouny Member

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    It's alive !
    All electronics working, the second motor makes weird noise, will try to lubricate it but if it fail i'll buy another one. Now it's time to jump into solidworks and make some sketch !

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  2. poumpouny

    poumpouny Member

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    Designing the frame, i know that the further away the motor is from the U joint, the less effort the motor has to do when moving the seat but would like to know if i really need this inner angle of my rod as this picture of @noorbeast and for what reason it is
    Thanks
    [​IMG]
  3. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    Within the parameters of any particular design the closer to 90 degrees the greater the effective use of torque. The effective use of torque falls off rapidly over about 38 degrees, so staying within those parameters helps trade off effectiveness against practical design.

    Tools such as SimCalc can help experimentation and tradeoffs between design and physics: https://www.xsimulator.net/communit...e-linear-speed-and-forces-of-your-design.270/
  4. poumpouny

    poumpouny Member

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    So here is the CAD modeling for the structure, it is not yet finished (pot holder / seat ) ... Also the simcalc result base on the structure measurement, i think it's OK according to simcalc help.

    Seat Mover v96.png Seat Mover v9 2.png Seat Mover v9.png Seat Mover v93.png Seat Mover v94.png Seat Mover v9 2.png Seat Mover v9.png Seat Mover v93.png Seat Mover v94.png Seat Mover v96.png
    imcalc.JPG
  5. poumpouny

    poumpouny Member

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    For the Motor torque, i leave it to default as i don't know what is the torque of my wiper motor
  6. poumpouny

    poumpouny Member

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  7. poumpouny

    poumpouny Member

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    Hello,
    Frame built, mounting it for test and all works as expected, dismounting it again to go for painting, meanwhile i'm modeling the arduino + 2 IBT enclosure, i will make the stl and the fusion 360 available once i printed and test it. Also modeling the pot holder.
    403406425_317994247813400_6526546665286342953_n.jpg 409298644_278921961432301_8006962146342157959_n.jpg 403421997_1275640896442086_5637439774728930700_n.jpg 403401951_24812063758384923_4398852919692541353_n.jpg 403405985_1072787247380074_6817369523945671292_n.jpg 411421292_286869217223023_8349803716136602687_n.jpg
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  8. poumpouny

    poumpouny Member

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    Ah, and i forgot to put the H shifter holder and in the same time the platform where the Hotas will stand for using with Xplane, putting it now before painting !
  9. poumpouny

    poumpouny Member

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    Please help, I'm using this schema to wire my electronics, but i don't find where should i wire the emergency button. I'm using 12V30 amp PSU and IBT 2.
    Thanks

    403406441_1124942535137999_892520225894236315_n.jpg
  10. Chris_Beeves

    Chris_Beeves Active Member Gold Contributor

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    I'd run one combined enable signal to both IBT and run that through the emergemcy button.
  11. poumpouny

    poumpouny Member

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    Thanks Chris but I don't understand what you mean, you mean combining the 2 minus wire from the two IBT's to the PSU and put the emergency button between ?
  12. Chris_Beeves

    Chris_Beeves Active Member Gold Contributor

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    Personally I have run them with both EN-pins pulled high with 5V. Maybe that doesn't work with your code.

    5V to emergency button, from emergency button to all EN-pins on the IBT's.
  13. poumpouny

    poumpouny Member

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    Ok Thanks i'll check that !
  14. poumpouny

    poumpouny Member

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    Finished designing the enclosure, i've designed it for 3 IBT since i will surely add traction loss to my rig later. I'll upload the stl once i verified it is working, i'm printing it right now :

    Capture 2.JPG Capture 3.JPG Capture.JPG
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  15. poumpouny

    poumpouny Member

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    Hello,
    So big problem today hihihi, i finished painting the frame, and printing the enclosure, i temporarily wire all electronics to be sure everything is working, and it is.
    The seat move accordignly to LFS replay since nobody is seating on it, but as soon as i 'm on it, the motor number 2 is very weak, very slow, i've put my 10 years old daughter and it's the same. The other motor work normally, even if it is weaker than i would think.
    I recalculate the center of mass of the upperframe, and balance it very well. IT is working a little better but still not enough, it seems the motor is weaker in one direction than the other.
    So i dive into SMC 3 tools and tweek the pwm max to something like 200 :D .the weak motor the works instantly better but 15 min after, the PSU fried :eek:.
    Fortunatelly , i have an electronician friend, and he found 2 transistor P13009 and a 1ohm resistor fried, we replace that and the PSU is up and running again.

    So my question is, is that just cause i pump up the PWM to high who cause the PSU to die or is it something else.

    PS : I've already remove ground from the motor so now only the ground is beeping when doing a continuity test with the ground and the motor plug.

    I've also a solar panel rig with 200 Ah solar gel batterie on it, i could also be using it but i'm afraid i'll fry something else in the solar panel system :think.
  16. Chris_Beeves

    Chris_Beeves Active Member Gold Contributor

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    I think 30A can be a little bit low for powering both motors. I’d try using a car battery just to check the max and preferably measure the current while testing
  17. poumpouny

    poumpouny Member

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    Most of the tutorial i see on 2dof and wiper use a 30Amp, but i'll try it on a battery, how could i mesure the current ?
  18. poumpouny

    poumpouny Member

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    I'm testing it with LSF now and what i can tell is that i almost don't have an "accelerate" and brakes effet, but in the other hand, i have lot of "hill" / "crest" effect, wich i don't really need, i've search on game manager setting but could find any setting on that (i'm on demo version, since i'm planning to ask for DIY licence once all up and running and when i reach the 250 coin to get the one week plugin download.
  19. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    Sounds like you have too much pitch allocated and not enough surge. See the tuning tips in the FAQs: https://www.xsimulator.net/community/faq/steps-to-create-a-motion-profile.228/

    Surge can also have manually entered different Min/Max values in the Tuning Center, to give a gear change effect. With surge the Max value is generally smaller than the Min value in the Tuning Center, to give the effect of a snappy gear changes: http://www.xsimulator.net/community/faq/snappy-gear-change-motion.121/
  20. poumpouny

    poumpouny Member

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    Thanks, it works :)
    Here is the first video of it moving, i'm really happy, left to close the enclosure and do some cable management
    Again, thanks to the amazing member of this forum.
    Time for testing and tuning it also hihihi
    Have a great Christmas to every one !
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