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My first DIY 2DOF + Traction loss project

Discussion in 'DIY Motion Simulator Projects' started by amoncada, Mar 31, 2023.

  1. amoncada

    amoncada New Member Gold Contributor

    Joined:
    Mar 27, 2023
    Messages:
    9
    Occupation:
    Project Engineer
    Location:
    Queretaro, Mexico
    Balance:
    30Coins
    Ratings:
    +5 / 0 / -0
    My Motion Simulator:
    2DOF, 3DOF, DC motor, Arduino
    Hello to everyone!

    This is the first post about my motion rig project. About 8 months ago I started to sniff around about motion rigs and some how I landed in this great site. I reviewed several projects that encouraged me to start my own project.

    I decided that I wanted a compact 2DOF + traction loss rig so I analyzed several projects and designs. The post from Scruck was the one that's make me pull the trigger and start the project. Actually I'm following this tutorial as a bible.

    I have been acquiring things since the last 7 months as I started from nothing. I assembly an entry level gaming PC, bought a G29 wheel, 32" monitor and started to play F1 and design my rig.

    This is the list of the items that I have acquired until now:
    Materials.png

    At this time, I have been focused in the mechanical desing, I would like to receive from you some feedback about it before manufacture it. This desing is inspired in the DOF reality H3 model. I incuded some plates to mount the hall sensors.

    2.png
    3.png
    5.png 7.png 8.png 9.png

    I know that the pivot point for the traction loss is not the ideal because it will fell like the it is spinning form the middel of the car, but that is the solution I found to the compact desing.

    I would like to know your thoguhts about this design and if you consider a change is required.

    While the rig be in manufacturing process, I will complete the electrical part.

    Thanks to all this comunity!

    Attached Files:

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    • Like Like x 1
    amoncada, Mar 31, 2023
    #1
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
    Jul 13, 2014
    Messages:
    21,146
    Occupation:
    Innovative tech specialist for NGOs
    Location:
    St Helens, Tasmania, Australia
    Balance:
    148,571Coins
    Ratings:
    +10,902 / 54 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    I am into compact rigs, so am looking forward to following your project :thumbs

    One suggestion for your consideration, and it relates to compact design, the connecting rod from the motor to the frame is most efficient at 90 degrees when at the rig rest position, torque efficiency drops off rapidly over about 38-40 degrees in either direction.

    You can have a play with SimCalc to get you head around the tradeoffs in design Vs physics: https://www.xsimulator.net/communit...e-linear-speed-and-forces-of-your-design.270/

    6.png
    noorbeast, Mar 31, 2023
    #2
  3. amoncada

    amoncada New Member Gold Contributor

    Joined:
    Mar 27, 2023
    Messages:
    9
    Occupation:
    Project Engineer
    Location:
    Queretaro, Mexico
    Balance:
    30Coins
    Ratings:
    +5 / 0 / -0
    My Motion Simulator:
    2DOF, 3DOF, DC motor, Arduino
    Thanks, for the feedback. I went to SimCac and I had a pitch efficiency of 91.17%, which I think is good; but, in the other hand, the roll efficiency was in 53.82%. I swapped the position of the motors to increase the distance between the CTC and the universal joint. I'm now in 97.71% in pitch efficiency and 98.30% in roll efficiency. This is how the model ended.
    11.png
    10.png

    My question now is, how-many degrees is this motion base recommended to tilt? With the current design I barely get 8.5° with the CTC at 45° :(

    Angle1.png
    • Like Like x 1
    amoncada, Apr 1, 2023
    #3