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Formula 3 simulator :)

Discussion in 'DIY Motion Simulator Projects' started by Gadget999, Sep 26, 2016.

  1. Gadget999

    Gadget999 Active Member

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    Thank you for the suggestions.

    I am using the ibt-2

    It has a output for the built in protection so i will wire up some leds and see if they get activated :)

    The battery idea is a good one i will wire up 2x12v for safety.

    I decided to try out the new ibt-4 which uses 2x pwm and a ground to trigger it. I am unable to work out if it is powered by the 'motor in' power and will find out when they arrive. I suspect i may not be able to use them because they will not go to 24v
  2. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    DC motor, Motion platform, 6DOF
    If you have the spare cash and want to stop experimenting, I and others could recommend the Sabertooth drivers (go the 2 X 60 if the budget allows) - One of them will do both motors and they are actually made for this type of application.
    • Like Like x 1
  3. Gadget999

    Gadget999 Active Member

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    looks like a nice unit - but out of budget for the time being

    i will try the ibt-4 that i have ordered should be ok for 50A

    if this is not up to the job i guess i can try 2 x ibt-2 per motor and get 86 A

    interestingly the motors i have are quite low amps (8A iirc)
  4. Gadget999

    Gadget999 Active Member

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  5. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    DC motor, Motion platform, 6DOF
    It's not the base current that causes the issues, it's the high regenerative voltages/currents produced by the motor when the motor changes direction often and at high speeds. If a driver/power supply is not designed for this - then it will just shut down.
    • Agree Agree x 1
  6. dr.feelgood

    dr.feelgood Member Gold Contributor

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    This is so very true... Even when i have low power motors on my rig, i get shutdowns with unmanned seat while testing rapid move changes with smcutil or so.

    It is nice if you can afford testing new drivers... I'm happy with IBT-2's over MM's, which were just disaster (china copys). Those IBT-3 / IBT-4's over ebay seems a bit suspicious... Hope you get valid stuff !!
  7. Gadget999

    Gadget999 Active Member

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    it appears one motor is causing the problem and in only one direction - i have leds wired up to the shutdown triggers - i wonder if i have a bad motor, or a bad ibt-2 - could the motor have bad brushes for example

    (the motors are rated at 8a continuous)

    the ibt-4 arrived today but they are not suitable for 24v

    i have ordered another pair of ibt-2 and plan to run them as pairs wired together

    i will feedback how i get on
  8. Gadget999

    Gadget999 Active Member

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    i added a cooling fan to the ibt-2 motor drivers today

    so far the motors have not shut down :)
    • Winner Winner x 2
  9. Gadget999

    Gadget999 Active Member

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    My Motion Simulator:
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    i have a bit of twist in the front of the sim when loaded up with a heavy person

    the UV joint is from steering column and is probably not strong enough

    I can either source a UV from a prop shaft, or fit a panhard bar

    do i need 2 bars on each side or one bar on the rear ?

    does anyone have any examples i can look at
  10. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    My Motion Simulator:
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    A single bar diagonally from the base frame to the seat frame will do the job.

    [​IMG]
    • Like Like x 1
  11. Gadget999

    Gadget999 Active Member

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    thanks @noorbeast - that looks simple enough :)

    will the pan hard bar not cause it to twist right when the nose dips and twist left when it rises ?

    do i need the angle between the left and right ends to be as shallow as possible

    I will get something knocked up asap and try it out
  12. Gadget999

    Gadget999 Active Member

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    • Agree Agree x 1
  13. Gadget999

    Gadget999 Active Member

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    Some pics of the panhard bar as requested

    It needs to be flat and level with the pivot axis

    It seems to have done the trick

    Attached Files:

    • Like Like x 2
  14. Zed

    Zed VR Simming w/Vive

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    @Gadget999 - looks like you answered your question about Panhard bars actually introducing some twist in the rig while they lock out much more twist. Yup! I had to add them too with a steering U-joint where the mounting didn’t have quite enough resistance to the sim twisting.

    Very nice looking rig!
    • Like Like x 1
  15. Gadget999

    Gadget999 Active Member

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    hope to get the DC DD wheel fitted soon and get it working again, i found an old projector that looks perfect to use on the wall.