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Compact Racing Sim - 6 DOF

Discussion in 'DIY Motion Simulator Projects' started by early_m, Aug 13, 2020.

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  1. early_m

    early_m Active Member

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    My Motion Simulator:
    2DOF, 3DOF, Arduino, Motion platform
    A lockdown project. More details coming soon.

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  2. Ads Master

    Ads Master

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  3. MarkusB

    MarkusB Active Member Gold Contributor

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    Wow, that looks amazing. You are definitely a talented CAD magician. If the real thing comes near this 3D animation, I definitely want to see it. Good luck with this project.
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  4. gforce

    gforce New Member

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    Sick. I love the bent arms for a tighter fit.

    Natural question: what software for the animation?
  5. Will974

    Will974 Member

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    The quality of this video is awesome !!!! And the rig is very beautiful with some inovation obviously !!! Wait to see the real simulator :)
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  6. Gadget999

    Gadget999 Well-Known Member

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    My Motion Simulator:
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    Is this a 3d render ?

    What is the speed of the movement in mm/s
  7. early_m

    early_m Active Member

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    My Motion Simulator:
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    Thanks, it will be exactly as per the video. Excited to start the project soon
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  8. early_m

    early_m Active Member

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    My Motion Simulator:
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    Thanks, the arms are also to ensure the pivot points are around the location of the centre of gravity.

    Modelled in Autodesk Inventor. Animation in 3DS Max with fstorm render.
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  9. early_m

    early_m Active Member

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    My Motion Simulator:
    2DOF, 3DOF, Arduino, Motion platform
    Yes its a render of my design, build will commence shortly.

    Linear speed will be approx 550mm/s.
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  10. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
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    Certainly some real talent on show here :thumbs.
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  11. hideki

    hideki Member

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    Gorgeous Sim man. Planning to sell or just for you?
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  12. early_m

    early_m Active Member

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    Thanks. No plans to sell, just for me
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  13. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
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    Will it be AC, or DC with existing parts?
  14. early_m

    early_m Active Member

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    My Motion Simulator:
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    Motors will be 24V DC

    Note sure what you mean by 'existing parts'?
  15. early_m

    early_m Active Member

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    My Motion Simulator:
    2DOF, 3DOF, Arduino, Motion platform
    The main aim of this project was to create a compact and cost efficient 6 DOF simualtor, while maintaining performance and build quality.

    The cheapest commercial 6 DOF simulator I could find is the DOFReality H6 which retails for appox $4000, so this was my benchmark to beat in both performance and cost.

    Some H6 stats:

    Motion range: 17°
    Speed: 500mm/s
    Torque 25Nm
    Floor foot print: 1200x1500mm

    I have decided to use 400W 24V DC motors with 1:50 gearboxes which provide the following:

    Rated speed: 60 RPM
    Torque 48Nm

    I plan to use 100mm CTC levers, but the lever will also allow for 80mm as a back up in case there are issues with load.

    I therefore calcualte the linear speed to be 630mm/s @ 100m, and 500mm/s @ 80mm.

    Total movement of the 6 DOF can be seen in the video. I am able to achieve 26° pitch, 22° roll and 25° yaw.

    The floor foot print of my simulator can be seen in the image below:

    Floor Print.jpg

    It is only 865mm at its widest point. It is a little longer than the DOFreality H6 but this is due to having more of a single seater style design. Also the peddles are adjustable. The H6 uses a separate control box that is not included in their floor foot print dimensions, so this is additional to the sim. My design is fully self-contained, with all electronics situated in the base.

    Base_internal.jpg

    The goal was to ensure that the main base, arms and seat stayed within a 1m diameter area, which has been accomplished:

    Base dia.jpg

    I also wanted to ensure that the seat was easily accessible, so the seat height is similar to what you would find for an office chair, at 480mm.

    Chair height.jpg

    One of the most important aspects of the design was to ensure the arms connect to the top frame at approximately the height of the centre of gravity. This makes it much easier on the motors. In order to do this I had to design the arms so that they bend around the frame, as the compact nature of the sim meant that they clashed with the frame if they were straight.

    The wheels and peddles are fully adjustable so that a wide range of users can use it.

    More pics:

    Front.jpg
    Rear side.jpg
    Rear.jpg
    Side angle.jpg
    Top End.jpg
    Top.jpg
    Base.jpg
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  16. SeatTime

    SeatTime Well-Known Member

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    Sorry, I thought you may be sticking with DC motors due to you already having parts off another sim. For a 6DOF application, Once you add up the cost for a good DC setup (Good Power supplies, Batteries, good quality drivers and motors; nowadays its not that much different to a powerful AC Servo/encoder motor setup - with performance hard to beat.
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    Last edited: Aug 25, 2020
  17. early_m

    early_m Active Member

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    Oh I get you. Dont think the 30kgcm hobby servos off the gseat will be up to the challenge ;)
    The motors with sabertooth come in at £850. To replicate the compact setup with ac servos and planetary gearboxes the cost would be £2700. Could get the price down by going the actuator route but this would increase the size of the sim when one of the main aims is to keep as compact as possible.
  18. SeatTime

    SeatTime Well-Known Member

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    Yes, understand those planetary gearboxes are expensive, just possibly trying to save you from the pain/expense that myself, Silent Chill and others have gone through. All the best with your project.
  19. Thanos

    Thanos Building the Future one AC Servo at a time... or 6

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    Ok, what you are going to use to power these motors? Did you add the cost of PSU or/and Batteries you will need? Also mind you will need really think wires to handle the current peaks, otherwise the wires will not get just too hot, they may even melt or catch fire.
  20. early_m

    early_m Active Member

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    What issues did you have?
  21. early_m

    early_m Active Member

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    Powered with 1000W PSUs. Using sabertooths with capacitors, so no batteries required? Not sure about wires yet. Is there a guide or calculator to figure that out?