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Finished - compact 3 DOF with traction loss

Discussion in 'DIY Motion Simulator Projects' started by Robdog, Jan 12, 2017.

  1. Robdog

    Robdog Member

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    My Motion Simulator:
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    IMG_0344.JPG

    It started out as a 2 DOF sim that could sit in front of my desk and then it grew a heave axis followed by traction loss. Each addition has made a huge difference to the feel of the sim and I am would not want a sim without any of the axes.

    I have added a homemade shifter, button box and a hand brake along the way too. I need to thank everyone on the forum for sharing their ideas and designs. Nothing on my rig is an original idea, everything has been shamelessly copied with maybe the odd tweak.

    My next investment will be a rift, after that who knows.

    IMG_0433.JPG


    IMG_0446 (002).JPG

    IMG_0344.JPG
    IMG_0346.JPG

    IMG_0352.JPG
    • Like Like x 17
  2. Stealthelius

    Stealthelius Member

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    Nice simulator @Robdog and very nice motors :thumbs
  3. SilentChill

    SilentChill Problem Maker

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    Nice work well done :thumbs

    Edit: any videos ???
  4. My.stAr

    My.stAr Member

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    A well build rig:thumbs
    Maybe a stupid question, but i can't identify what the second motor in the back is doing?! Is it there for heave?
  5. MarkusB

    MarkusB Active Member Gold Contributor

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    My Motion Simulator:
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    The motors look like these: https://www.motiondynamics.com.au/worm-drive-motor-12v-24v-200w-180-rpm-20nm-torque.html
    If so, it depends on the gear box. The default one with 25:1 (which seems to be used here) may not suited to lift an entire rig, but the 50:1 or 60:1 probably are.
    And the motors used in the other thread in which you asked the same question an hour ago are definitely strong enough. :)
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  6. momoclic

    momoclic Active Member

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    Beau travail.
    Cependant une chose me choque dans la réalisation. De par la complexité de la cinématique d'un système bielle-manivelle, la symétrie des mouvements à droite et à gauche de l'axe de roulis du simulateur n'est pas assuré. Pour ce faire il faut respecter des règles que j'ai évoqué dans ce sujet :
    https://www.xsimulator.net/communit...ng-tutorial-3dof-heave-axis.9249/#post-122634
    Good work.
    However one thing shocks me in realization. Due to the complexity of the kinematics of a rod-crank system, the symmetry of the movements to the right and to the left of the roll axis of the simulator is not assured. To do this, you must respect the rules that I have mentioned in this subject.
  7. Robdog

    Robdog Member

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    The motor in the middle is for heave , the one on the right is for traction loss.

    All the motors are from Motion Dynamics and are 200W with 25:1 gearboxes. The heave is assisted with a spring from a chair tilt mechanism, it runs a bit hot when the weather is hot so I have fitted a cooling fan. It doesn't seem to struggle with the heave, maybe that's because I am a light weight.

    I will try post a video over the weekend.
    • Like Like x 2
  8. Robdog

    Robdog Member

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    I haven't read your post yet, will have a look. I have not experienced problems with symmetry, the rig is very solid and responds well to all movements.
  9. speedy

    speedy Well-Known Member

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    Nice job @Robdog ...
    Is this elbow is rotating ? Is this a compensation spring from an office chair ?
    more details please ... :thumbs
    Thanks for sharing good ideas ...
    IMG_0346.JPG
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  10. Robdog

    Robdog Member

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    The elbow is connected to an office chair tilt mechanism so the spring helps support it. I tried to upload a video of it working but it is a .MOV file and I can't upload it. Any idea how I get around that?
    • Informative Informative x 1
  11. stevemontuno

    stevemontuno Active Member

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    Stick it on Youtube and post a link up .
    • Agree Agree x 1
  12. speedy

    speedy Well-Known Member

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    Thanks for the effort ... Youtube accepts any kind of video format ... upload and just copy it's given URL and paste it here using this button to past the video URL correctly .
    1.jpg
    • Agree Agree x 1
    Last edited: Jan 13, 2017
  13. dynt66

    dynt66 New Member

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    Would love to see a video of this all working also.
  14. speedy

    speedy Well-Known Member

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  15. Robdog

    Robdog Member

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    Some videos showing the rig and the heave detail. Track is Brands Hatch, nice and bumpy.



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  16. Stealthelius

    Stealthelius Member

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    Hi @Robdog. What about the noise of the motors ? I have a pair of Wiper motor and them are too noisy.
  17. RacingMat

    RacingMat Well-Known Member Gold Contributor

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    @Stealthelius : if the motors are driven by PWM below 20 kHz, they are noisy

    what driver are you using? motomonster can be tweaked to ultrasonic PWM
  18. Robdog

    Robdog Member

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    The motors are not noisy at all, the only noise I have is a rattle from the rod ends when the rods move.
  19. mirkobastianini

    mirkobastianini Active Member

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    Man... thanks for the idea of traction loss ;)
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  20. speedy

    speedy Well-Known Member

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    Yeh I keep coming back and look again at the simple and effective concept ...
    Good job man .:thumbs
    • Agree Agree x 1