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Car chassis project

Discussion in 'DIY Motion Simulator Projects' started by sim2go, Aug 29, 2017.

  1. sim2go

    sim2go New Member

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    i have read that backlash is imminent, unless precision gears or other type reducers are used.

    thank you for suggestion, will try shorter distance as axis limitation is on 18/100 now
  2. sim2go

    sim2go New Member

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    hi again,
    thank You noorbeast for suggeation.
    indeed, backlash got a little better going from 18 to 10 centimetera, but it still persistent. only way i can get almost rid of it is lowerint motor power to 40 percent, which makes movement not interesting.
    i'm looking into planetary reducer, but could not find much of them used in xsim.

    maybe you guys seen or tried it? how compared to wormgear is ot more stable?

    also would like to ask about simtools settings -
    lets say axis limitation is set to 50percent.
    the movement is rich - rig moves when accelerator is touch'd, but those 50percent is too much for rig when it get to max value (crashing car for instance).
    when set to 30 percent, the acceleration is almost not felt, but max values are safe.

    is it possible to get richer movement with less limitation?



    Thank You!!!

    [​IMG]

    thats backlash

    https://giphy.com/gifs/fRaqyXyDMmgM5iO9Fe
  3. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    Linear actuators are more efficient, with far less backlash, than worm gearboxes and you can build your own: https://www.xsimulator.net/community/faq/diy-linear-actuators.248/

    SimTools mixes motion on the fly and often part of the issue is too aggressive PID and SimTools settings: https://www.xsimulator.net/community/faq/steps-to-create-a-motion-profile.228/

    It would assist troubleshooting if you posted pictures of all of your settings and a video that shows the rig movement and game screen at the same time.

    The other complication you have is mass, once something is moving in a certain direction it takes a lot of power to control it.
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  4. SeatTime

    SeatTime Well-Known Member

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    No Simtools software filter we help with your mechanical issues. You could try some gas struts (you may need to experiment with different Nm ratings) to help tame the oscillations a little bit, (need to be careful, as gas struts can bring with it other issues for a simulator) but as @noorbeast alluded to, a better quality Gearbox is really needed.
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  5. sim2go

    sim2go New Member

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    Added two 100N gas struts. It helped to reduce backlash time. might play later changing theit position.

    if anyone have link to planetary reducer for ac motor (b14, m8 screws), please, hit me with it.

    thats result with way smoothed pitch.
    i like yaw tho

    https://i.makeagif.com/media/6-26-2018/yuXU6k.gif
  6. sim2go

    sim2go New Member

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    Does anybody can tell what type of reducers are used here?



    l'm stuck on choosing the right, low backlash, type reducer for ac motor.
    For asking about using planetary reducer with AC motor got an answer that it should be used with servo motor instead.

    Do anybody have knowledge or some links about typea of reducers for this kind of situation?
    Last edited: Jul 3, 2018
  7. joe extraknow

    joe extraknow Member Gold Contributor

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    I tired Dodge 3DoF simulator last year, like yours, they move whole car. Feel really good, but they used 4 powerful Actuator/Motors on four wheels:

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  8. sim2go

    sim2go New Member

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    I guess these are planetary?

  9. joe extraknow

    joe extraknow Member Gold Contributor

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    these are AC motors though. I tried Ford factory 6DoF and 4DoF car simulators with AC servo motored actuators at Chicago auto show last year. No good, though. Lack of all the road vibrations and details. The 3DoF as this one also has heave dof, so the Ride Frequencies are important. You will not get effective ride frequencies above 3 Hz, which I believe that required for a racing car feel with high speed on the track (you might unlikely have this problem with 2Dof seat mover -- no heave). As such, I believe AC motors really suite for fly simulator not racing car sim. To solve this issue, four vibration actuators added to each wheel, respectively, see page 3 and 5 below, up to 20Hz:

    http://www.nads-sc.uiowa.edu/dscna/2001/Papers/Chen_NADS at the University of Iowa....pdf

    or see video at 0:37


    If you really want to move your whole car and feel like a "racing car", I bet the D-Box probably is your best choice if you can cut your cab weight down below 1200 lb. Why do you want move whole car? While you racing, you cannot see front and end. You just need cabinet/cockpit part, can you cut front and back off? Here is guy who just did like this, he used D-Box:
    http://www.isrtv.com/motion-simulator/wil-mayaman-tosados-mind-blowing-porsche-motion-rig/

    Ofc, the D-box is not cheap. Their SW offers vibration module and suspension module allowing you to adjust to feel, which SimTool is lack of.

    Best luck!
    Last edited: Jul 4, 2018
  10. sim2go

    sim2go New Member

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