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1DoF / Traction Loss Only Build

Discussion in 'DIY Motion Simulator Projects' started by David Baker, Mar 9, 2022.

  1. David Baker

    David Baker New Member Gold Contributor

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    My Motion Simulator:
    DC motor, Arduino
    Hi all,
    I'm starting my build with an initial focus on only 1 DoF for traction loss. My opinion is that it is the one that I would like to experience motion with most.
    Since I already had a 12VDC 8.4A power supply, a 3/4 turn pot, and an old Arduino Uno from other projects I could get started on the proof of concept rather quickly.
    I purchased a wiper motor and IBT-2 and I'm setting off.
    upload_2022-3-9_9-4-25.jpeg
    Right now I plan on attach this to my OSR F1 style seat (that I built myself from the plans). I'm thinking a base plate that everything sits on. Then a lazy susan bearing and some skate board wheels to stand the traction loss platform off the base. Mount the cockpit to the traction loss platform and then mount the motor to the "back" of the seat. Run the linkage from the motor to the base plate and (fingers crossed)...motion.
    upload_2022-3-9_9-4-48.jpeg
    • Like Like x 5
    Last edited: Mar 9, 2022
  2. David Baker

    David Baker New Member Gold Contributor

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    My Motion Simulator:
    DC motor, Arduino
    I've been working on the design for the 1Dof with an eventual 3DoF upgrade path.
    Here is the model for the 1DOF. I'm mounting the TL motor to the plate that will go under the cockpit. The linkage connects to the base plate. The seat base will pivot on a 12" lazy Susan bearing under the brakes.
    upload_2022-3-15_10-29-3.png

    Attached Files:

    Last edited: Mar 15, 2022
  3. David Baker

    David Baker New Member Gold Contributor

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    My Motion Simulator:
    DC motor, Arduino
    Updated drawings. I moved the TL motor more to the center to accommodate upgrading this to a 3dof in the future.
    upload_2022-3-22_13-23-46.png
    The bottom plate is 12" at the front where the lazy susan bearing is. At the back it is 32" wide.
    The top plate that the existing cockpit would sit on is 23" wide. That would give about 4" of swing from side to side for the TL motion.

    I have 5/8" flange mount ball bearings for a conveyor transfer table.


    I also have 52mm skateboard wheels.


    I've read that many prefer a higher durometer caster for the TL, but these seem like a bit more of a PIA to mount with how my design is coming together. I am concerned that the transfer table bearings will be noisy though.

    I may cut my plywood and try and take it to the next step in the next week.
    • Like Like x 2
  4. Escartiz

    Escartiz Member

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    My Motion Simulator:
    3DOF, DC motor
    Your rig is looking great. I just finished the traction loss for mine. I initially wanted to mount the motor just like your planing, on the moving seat plate. After some testing, I realized it was just adding more weight to the moving structure so I decided to mount the motor on the base plate that stays rigid on the floor. That way the linkage is just pushing/pulling the seat plate instead of moving the extra weight mass and it does it with much less effort. traction loss.jpg Here is a picture in case you like to reconsider redesigning that part.
    • Like Like x 2
  5. David Baker

    David Baker New Member Gold Contributor

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    My Motion Simulator:
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    I think reversing the locations should be fine and you are 100% right that moving the motor off the traction plate reduces the mass that needs to be moved. I'm trying to do this with a wiper motor right now and I'm not sure if that will have the muscles to accomplish this. I should probably just go to a bigger motor but I'm reluctant to spend more on that right now as I'm in proof-of-concept phase.

    This was the plan for upgrading to the 3DoF. upload_2022-3-23_8-50-1.png
    I would have to think about the TL mounting location on the TL plate so it doesn't interfere with the other motors long term.
  6. David Baker

    David Baker New Member Gold Contributor

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    My Motion Simulator:
    DC motor, Arduino
    Rotating the TL motor and offsetting it to one side.
    upload_2022-3-23_14-0-57.png
    • Like Like x 1
  7. David Baker

    David Baker New Member Gold Contributor

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    My Motion Simulator:
    DC motor, Arduino
    So I built the base and TL platform.
    upload_2022-3-25_19-5-53.jpeg

    upload_2022-3-25_19-6-15.jpeg

    unfortunately my piece of plywood is warped, but hopefully once I get weight on it will be in better shape.

    also, I bought a makermotor which seems “better” than my wiper motor. At least it makes way less noise in SMC3. I need to get a shaft coupler and then make the lever arm, but I’m a little closer.
  8. David Baker

    David Baker New Member Gold Contributor

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    My Motion Simulator:
    DC motor, Arduino
    I stained it this morning and then tried to wet it and unwarp it. Fingers crossed.
    upload_2022-3-26_10-44-37.jpeg
  9. David Baker

    David Baker New Member Gold Contributor

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    My Motion Simulator:
    DC motor, Arduino
    The un-warping has been mostly successful.
    The ball bearings are quite loud when moving the TL platform back and forth. Also, I need a solution for the motor “crank”. The motor has a D shaped shaft but no method of “locking” it. I think a clamp like Simulink sells would be the way to go. I need to be able to move the TL platform as well as get the potentiometer linked.
    Last edited: Mar 30, 2022
  10. David Baker

    David Baker New Member Gold Contributor

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    My Motion Simulator:
    DC motor, Arduino
    Mounted the motor. The motor crank should arrive later today. I found an arm on Amazon for throttle body linkage that I hope works.

    The thread pitch on my threaded rod didn’t match my rod ends so I had to order a new one. Just another delay.
    upload_2022-3-30_11-0-4.jpeg
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    Last edited: Mar 30, 2022
  11. David Baker

    David Baker New Member Gold Contributor

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    My Motion Simulator:
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    So the lever arm was delivered. It will probably work, but I had to make an adapter to accommodate the 3/8 bearing at the end of the rod end. I’ll need another bolt to secure it to the lever also, but I’m starting to see the light at the end of the tunnel.
    upload_2022-3-30_17-31-50.jpeg

    I’ll need to trim the wood near where the rod end is now so I have room for the threaded rod to drop to the TL plate or maybe I’ll just build up a mount. Not sure and I don’t want to induce any loading into the mount that would fail.
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  12. David Baker

    David Baker New Member Gold Contributor

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    My Motion Simulator:
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    Everything arrived and is hooked up!
    It even moves with me sitting in it!
    upload_2022-4-1_8-17-48.jpeg

    Now I have to tune it.

    And I’m thinking of replacing the roller bearings with casters. It is loud and also they seem to have created dents in the plywood that are detents that don’t help the movement.
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  13. David Baker

    David Baker New Member Gold Contributor

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    My Motion Simulator:
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    I've been on spring break vacation with the family for the past week, but I came home to my new casters. I was able to get them installed but have not yet had a chance to test them. There was a couple of small fitment adjustments needed just checking by hand.
    Hope to get some testing/tuning done tomorrow.
    • Like Like x 1
  14. David Baker

    David Baker New Member Gold Contributor

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    My Motion Simulator:
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    Here’s a pic of the new casters under the TL platform. it is much smoother and quieter than the bearings.
    i had to build up a base between the bottom plate and the TL platform for the lazy Susan to mount to, but that wasn’t difficult.
    upload_2022-4-10_11-18-47.jpeg

    I ask noticed that my 8.3A PS was cutting out, so
    I took a page out of DMAX’s playbook and hooked up a car battery.
    upload_2022-4-10_11-18-1.jpeg

    Attached Files:

    • Like Like x 1
  15. David Baker

    David Baker New Member Gold Contributor

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    My Motion Simulator:
    DC motor, Arduino
    The motor mount was not solid enough so I had to reimagine it. Seems more solid in some brief use.
    upload_2022-4-13_15-57-13.jpeg

    Also, the new 12V 30A supply arrived so no more car battery.
    Tuning is ongoing.
  16. Kenshiro27

    Kenshiro27 Active Member

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    My Motion Simulator:
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    we are waiting for the sequel now;)
    • Like Like x 1