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3 DOF build

Discussion in 'DIY Motion Simulator Projects' started by Vincent Bernier, Apr 13, 2021.

  1. Vincent Bernier

    Vincent Bernier New Member

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    Hi all,

    After seeing halloween2go build https://www.xsimulator.net/community/threads/full-frame-2-dof-traction-loss-new-build.14740/ , I'm making the jump to build my motion rig.

    I'm ready to order parts, but just want to check with you guys if I'm not missing something

    3 Crab pot motors
    1 Arduino A000066 Uno R3
    1 Rextin DC 12V 400W 33.3A Regulated Transformer Power Supply Driver
    3 BTS7960 Motor Driver Board, IBT-2
    3 6127V1A360L.5FS

    I know about the POT coupler, but I will wait till I start the build to get the right ones.
    • Like Like x 1
  2. Vincent Bernier

    Vincent Bernier New Member

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    Ok, so I started a small scale rig. I have cheap motors with encoder from amazon. I 3D printed some rod ends and a universal joint. Used fidget spiner bearing as rollers.

    I also ordered a arduino Uno and IBT-2 that I will use for the final rig.

    I am at a point that I need help for the wiring. Here is the wiring for the motors.
    Red: Motor power + (exchange can control rotating and reversing)
    Black: Coding power- negative (3.3-5V) polarity cannot be wrong
    Yellow: Signal feedback
    Green: Signal feedback
    Blue: Coding power + positive(3.3-5V)polarity cannot be wrong
    White: Motor power - (exchange can control rotating and reversing)

    Red and white are easy to figure out.
    Black and Blue to 5v and GND of the arduino
    Yellow and Green, I figure one must go to the A0, but what about the other one?

    Here are picture of what I have so far.
    Rod Ends IMG_6708.jpg
    U-Joint
    IMG_6714.jpg

    Box
    IMG_6712.jpg

    Motors
    IMG_6709.jpg
  3. Vincent Bernier

    Vincent Bernier New Member

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    Little closer to the final test. After finding out that the encoders of the motors did not work with SMC3, I installed 10k POT with 3D printed brackets.

    Completed the wiring, sorry for the rat nest, got to work on my cable management.

    I did the the SMC3 test by RufusDufus and all motors work.

    Hopping to test soon. Here are more pictures.
    Complet Test Rig
    IMG_6721.jpg
    Front View
    IMG_6722.jpg
    Front pivot for traction loss
    IMG_6723.jpg
    Bad wiring job (but working)
    IMG_6724.jpg
    Arduino and IBT enclosure
    IMG_6725.jpg
    Motor and POT link
    IMG_6726.jpg
    • Like Like x 1
  4. Vincent Bernier

    Vincent Bernier New Member

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    Hello all,

    Finally got my PSU and motors.

    Now I have a problem, when testing with the SMC3 utility, my PSU go in over voltage protection when testing with the motion. I have Meanwell NES-350-12 PSU. Would adding capacitor in parallel help? If yes, how do I need to wire this?

    Thanks
  5. Vincent Bernier

    Vincent Bernier New Member

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    I forgot to mention my setup

    3 NES-350-12 PSU
    3 Crab pot motors 180W
    3 IBT-2 controllers

    All the wiring is made with 10GA

    IMG_6759.jpg IMG_6760.jpg

    Attached Files:

  6. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Have you reconfigured SMC3 settings to suit your new hardware?
  7. Vincent Bernier

    Vincent Bernier New Member

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    Not all the way, when I set PWMmax to 100, this is when they overvolt. At 50 it's fine, but the green line can't keep up with the blue line. I will try to configure other parameters before tweaking the power.
  8. Vincent Bernier

    Vincent Bernier New Member

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    So I did some fine tuning and was able to get the PSU not to stall except in Square mode, they stall instantly unless I get the power way down and that makes the motors unable to follow in motion mode
  9. Vincent Bernier

    Vincent Bernier New Member

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    Finally, I came around to building my simulator. Still have some fine tuning to complete.

    Attached Files:

    • Like Like x 1
  10. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    What CTC distance are the leavers using, too large and there ll not be enough torque for the load.
  11. Vincent Bernier

    Vincent Bernier New Member

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    CTC is ajustable from 3" to 6", but the PSU would stall with the motors only, no rig attached.
  12. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Sounds like SMC3 settings are not refined and/or there is a hardware issue.
  13. Nicolas Bolduc

    Nicolas Bolduc New Member

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    My Motion Simulator:
    6DOF
    Hi, i made a working 6dof platform using the same motor as you i think. Located in levis. If you need help i can guide you a bit i guess

    PM me.

    Nicolas Bolduc
    Last edited by a moderator: Oct 8, 2021