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G-SEAT

Discussion in 'DIY Motion Simulator Projects' started by gforce, Jul 26, 2020.

  1. cfischer

    cfischer Active Member Gold Contributor

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    Thanks!

    I was thinking about your rig when I thought maybe I could add a bunch of stuff to get the illusion of heave. I really like your thigh strap and how your paddles squeeze when you dip down. Its crazy to me how you (or at least I) just don't know how something will really work until you're driving it in vr. When my seat dipped down as I drove a valley I let out a noise of excitement for sure. I do hope to come back to heave as it's the ultimate sensation imho.
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  2. Jspanos

    Jspanos New Member

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    Totally love your take on the push/pull SFX actuator... Very smart using the weld and seems to make the most sense. I sent you a message as I too am going this route for TL and surge and was hoping I could pick your brain a bit regarding some technical questions about printing files for your slider, extrusion length etc. I appreciate your contributions and time.
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  3. Pinello

    Pinello New Member

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  4. cfischer

    cfischer Active Member Gold Contributor

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    Thanks for the kind words.
    I have thought about the backrest sliding up and down, maybe something for the future.


    I have been busy with a newborn for the last few months. Not much progress on the sim at the moment.
    Resized_20210106_135404.jpeg
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  5. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    Cute as a button!
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  6. cfischer

    cfischer Active Member Gold Contributor

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    So now onto the torso mover and planetary gearbox servos.


    Took out the old stuff
    20201025_122941.jpg

    Machined/tapped a bunch of holes in 2x4 steel tube.
    20201024_185435.jpg

    Welded on a plate for a beefy u joint.
    20201024_170835.jpg
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  7. cfischer

    cfischer Active Member Gold Contributor

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    I machined crank arms for the gearboxes, made some extra for experimenting.
    20201025_214939.jpg

    Welded on some laser cut plates to the tube.
    20201026_204540.jpg

    The bottom of the Ujoint is made to screw I to wood for now so I can quickly adjust it.
    20201101_155502.jpg

    Assembling
    20201026_213641.jpg
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    Last edited: Jan 31, 2021
  8. cfischer

    cfischer Active Member Gold Contributor

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    Cranks and links
    20201209_112823.jpg


    20201209_112958.jpg
    Then I welded on some Brackets for Seatbelt and mounts for the mover mechanism
    20201209_200802.jpg
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  9. cfischer

    cfischer Active Member Gold Contributor

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    Here are the motors and linkage for the gseat paddles and Torso mover.
    20201211_092200.jpg
    The wood plywood and 2x4 frame is nice for changing around the location of things while trying out ideas.

    The addition of the torso mover solves the false cue you get while being pushed hard from the outside paddle during a turn or getting pushed forward during acceleration.

    It works pretty well, plus it gives an excellent jolt from bumps to other cars or walls. The motors for the mover have a lot of smoothing applied while the paddles have lots of high frequency data in them.
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  10. cfischer

    cfischer Active Member Gold Contributor

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  11. RacingMat

    RacingMat Well-Known Member Gold Contributor

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    from 3:30 the look on the back mechanism in action is really impressive
    I got a Gecko seat for a while and I'm curious to feel the differences with your moving back
    I do wish I could test your rig :p

    when you'll get rid of the wood and use a more rigid structure, it'll be even better (at the end of the video, we can see that the structure is wobbling when the driver gets out).

    that's a really interesting design, congrats!
  12. cfischer

    cfischer Active Member Gold Contributor

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    Thanks for the kind words. If you're ever around my way (north of Denver Colorado) you're more than welcome to come try it out. I see you're in France but, well, there is the invite anyway.

    I agree, I wish I could try this against the Gecko. If anybody near by has one I could try let me know.
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  13. Terje Helle

    Terje Helle New Member Gold Contributor

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    Nice design, and great work! Following.
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  14. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
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    That's looking great and really balances out the false cues :thumbs. As I have now moved away from DC motors any chance of finding out what type of AC servos and gearboxes that you have used in the latest build?
  15. cfischer

    cfischer Active Member Gold Contributor

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    Sure, 60ST-M01930 motors power everything you see in the later shots of the video. The paddles use 16:1 which I am considering changing to something more like 20:1 and the torso mover uses 40:1. You're going to love the servo world(I know you've already got some). Other than dealing with the damn drives that is.

    20200926_182723.jpg
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    Last edited: Mar 13, 2021
  16. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
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    Thanks, appreciate it. I have found the AC drives to be almost plug and play compared to a high power DC setup.
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  17. Trigen

    Trigen Active Member

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    Great stuff!

    What's the slop like if any with these gearboxes?
    Last edited: Apr 17, 2021
  18. cfischer

    cfischer Active Member Gold Contributor

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    Thanks,
    I have sampled gearboxes from several companies on aliexpress/alibaba. These guys have been the best in terms of backlash and quality.
    https://www.aliexpress.com/store/1907567

    The paddle gearboxes in the video have quite a bit of backlash. I don't notice it unless I'm driving in the grass, then it rattles as you can hear.
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  19. Trigen

    Trigen Active Member

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    Thanks. Whats always bothers me when using DC drives and gearboxes is the backlash and i feel like i loose a lot of detail. I dont know if its possible yet to set a minimal movement for small stuff in PT mover to overcome this lack of detail. When there is full load on the flaps you dont get it as much. Im still on the fence if i wish to use actuators or not. It makes it more complex and difficult to set up. But if im going to spend so much on it i'd love to have the detail of the ballscrews. Sadly i do not have the tools to fabricate all the brackets and arms that you do. Any chance you could make a few later on?

    Also if you dont mind me asking. Where did you get the U joint? I struggle to find the full assembly

    I dont have it on my rig at the moment but here's what i used to have and will install sliders on later. I do however find the torso mover concept to be quite nice too. In general you will tilt your back anyway so i dont think you actually need a linear slide in the back. Im seriosly considering just repurposing my 200mm 3x sfx system and go full G seat.

    The connections arnt quite strong enough with the corner brackets so it needs to be fastened better. Before i bought the sliders i used 3d printed ones inside the slots.

    back seat slider.jpg
    Last edited: Apr 28, 2021
  20. 김민혁

    김민혁 Member

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    The bucket seat looks ergonomic! It doesn't seem easy, but I support you. You have good woodworking skills.