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DIY G-seat Insert using 1 AC Servo - WIP

Discussion in 'DIY Motion Simulator Projects' started by sberns, Dec 6, 2019.

  1. sberns

    sberns Member Gold Contributor

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    My Motion Simulator:
    3DOF, SCN5, Arduino
    Concept: DIY Back-panel only GSeat insert that can be placed/secured on top of any racing seat powered by a single 220V AC Servo Motor and a bowden cable system.

    Background: My current motion rig is an amalgamation of a Stage 2 SimXperience seat mover on top of an SFX100 actuator system, DIY Simwind, Buttkickers x4, @SeatTime's fantastic active harness tensioner, and a DIY GSeat insert. My seatmover + belt tensioner + buttkickers are great for accel/decel cues, and the SFX100 is ideal for pitch/roll/heave. The Gseat fills in the otherwise missing lateral Gs very well. I have tried using the GSeat for other effects but found it was overkill and led to too many motion cues for me -- less is more. Therefore, I am limiting my efforts to recreating lateral G-forces only. This plan could easily be modified to use a second AC Servo motor to recreate other effects.

    Why: All of my previous GSeats have used RC Servos. While they work well, I continue to miss the power and responsiveness that stronger/faster motors can provide.

    Main Parts List:

    3d printed and Custom steel Parts: see pics of (main) pieces (back panel will have a mirror image as well)
    220V AC Servo Motor: https://www.aliexpress.com/item/328...1.0&pvid=b7eaabe9-65ed-40da-8312-4be4407b7219
    200mm Linear Guide Slide Table: https://www.aliexpress.com/item/400...1.0&pvid=b7eaabe9-65ed-40da-8312-4be4407b7219
    300mm Linear Rails x 2: https://www.banggood.com/Machifit-3...-p-1239194.html?rmmds=search&cur_warehouse=CN
    Linear Rail Block x 2: https://www.banggood.com/Machifit-M...-p-1238091.html?rmmds=search&cur_warehouse=CN
    Bowden Cables: (we need 2 rear brake cables) www.amazon.ca/gp/product/B00L8NDVD6/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
    www.amazon.ca/dp/B001V4WU16/?coliid=I11Z902DZ4D23E&colid=1IDRNLKKUPSPQ&psc=1&ref_=lv_ov_lig_dp_it

    STLs: (so far): (rename .pdf to .stl)


    IMG_6313.jpg IMG_6314.jpg Back Panel.jpg Back Plate.jpg

    Attached Files:

    • Like Like x 3
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    Last edited: Dec 14, 2019
  2. Ads Master

    Ads Master

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  3. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    My Motion Simulator:
    3DOF, DC motor, JRK
    I am looking forward to seeing this come together, it should be a powerful system.
  4. Sebj

    Sebj Active Member

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    Yikes. Can't wait to see this too. You're building a close to ideal system available today.
    Keep us updated
  5. Sebj

    Sebj Active Member

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    My Motion Simulator:
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    Do you have a pic of your current rig
  6. sberns

    sberns Member Gold Contributor

    Joined:
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    My Motion Simulator:
    3DOF, SCN5, Arduino
    Here are two pics of the current rig including current RC servo GSeat insert:
    IMG_6323.jpg IMG_6324.jpg
    • Like Like x 2
  7. Sebj

    Sebj Active Member

    Joined:
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    My Motion Simulator:
    2DOF
    Thanks for posting. How are the servos holding up with all the weight?
  8. sberns

    sberns Member Gold Contributor

    Joined:
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    My Motion Simulator:
    3DOF, SCN5, Arduino
    I have 6 rc servos per panel, each can move 22kgcm. They work reasonable well, but leave a lot to be desired. They also need replacing every so many months, which ends up being quite the chore - to figure out which is failing, to sync them all together...and the linkages fail periodically as well, but much less often.
    • Informative Informative x 1
  9. RacingMat

    RacingMat Well-Known Member Gold Contributor

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    your rig is awesome :)

    interesting project! keep going and sharing :popcorn

    yeah, that's a pain needing several motors for 1 actuator... you describe very well the burden
  10. Sebj

    Sebj Active Member

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    My Motion Simulator:
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    Thanks for the info, likely why simx also changed it up for their GS5

    Does your SFX perform 100% with the simx gear on top? Not too heavy? I have an 8020 2dof w TL, I fancy putting up on SFX in the future
  11. sberns

    sberns Member Gold Contributor

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    My Motion Simulator:
    3DOF, SCN5, Arduino
    Definitely not too heavy. Throws it around like it’s a feather! But there is a very small amount of flex in the simX rig design. A friend has an SFX system on a P1X. I find I have to use almost twice the heave setting (15% vs 8%) to get the same road texture feel (only for heave as the bigger motions feel the same). It’s worth it though as Surge feels amazing with the seat mover integration.
    • Informative Informative x 1
  12. sberns

    sberns Member Gold Contributor

    Joined:
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    My Motion Simulator:
    3DOF, SCN5, Arduino
    Most of my steel parts have arrived. Unfortunately I made one mistake with bracket hole placement. That may delay the completion of this project until the beginning of January.

    Some progress: (back plate, will rest on back of seat; sway panels to be mounted to this)
    86D85F1C-9919-469B-98CE-C375E8508B65.jpeg
  13. sberns

    sberns Member Gold Contributor

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    My Motion Simulator:
    3DOF, SCN5, Arduino
    Today’s progress below. Next will be to attach the bowden cables. Need to design and print the cable mounts to the back plate.

    FDB09BCF-8D88-4B8A-AAF9-030A57618180.jpeg FCAEC9A1-76A1-4272-AFEB-C366CF573D62.jpeg 46D273E1-7EAF-49FD-9A31-C3138E48584F.jpeg 6BDDF5FB-D113-4933-9051-7548676C728A.jpeg B79B3F18-A102-4C67-9769-1C95BFA86B28.jpeg 02033BDD-8F5F-4BA1-B579-E879A99C9FE6.jpeg
    • Like Like x 5
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    Last edited: Dec 19, 2019
  14. sberns

    sberns Member Gold Contributor

    Joined:
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    +56 / 1 / -0
    My Motion Simulator:
    3DOF, SCN5, Arduino
    Latest update: I’ve been working on getting the system up and running and have had troubles along the way. Mostly, this all related to my inexperience working with bowden cables and not anticipating exactly how the forces are transmitted. That all resulted in many iterations and redesigns of 3d prints and the use of a bicycle hollow stem screw to achieve reliable function without destroying the 3d prints. After much frustration, I finally have a working Gseat! Still much to optimize, and I may add some compression springs to return the panels to neutral once the force is released. Here are some pics of the current state. Video will be challenging for now as the panels do not return to neutral when in use without a passenger.
    5F067863-24B8-4385-9A9D-C96B7220BD22.jpeg 67715EB4-77CA-4FFB-B9AC-31FE83F357C2.jpeg 67E71C9F-2C3E-409D-8B8B-6023A6CEDCC1.jpeg E7A72A90-B06F-48F7-9664-F5EE609B84DA.jpeg 2EE58F82-1D42-4F6F-B658-77A8BD67788F.jpeg 46A3E484-E933-4FB7-B369-59515756446A.jpeg A805528E-6F42-43C8-A69A-CB51091CCFAB.jpeg 41B4226C-A6BF-4F23-976A-7C3FA72BEA1B.jpeg 1E677CFE-F239-48B3-B3D1-C18CFC968FEB.jpeg
    • Like Like x 4
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