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Budget 2DOF

Discussion in 'DIY Motion Simulator Projects' started by Surferjo86, Jun 10, 2020.

  1. Surferjo86

    Surferjo86 New Member

    Joined:
    Sep 24, 2019
    Messages:
    9
    Location:
    Sheffield
    Balance:
    90Coins
    Ratings:
    +5 / 0 / -0
    My Motion Simulator:
    2DOF, 3DOF, DC motor, Arduino, 4DOF, 6DOF
    My new project will be extremely low budget. Following this chaps design

    Purchases so far:

    Arduino Uno
    x2 High Power Motor Driver Module BTS7960B 43A Arduino Intelligent Vehicle Robot
    x2 400w mobility scooter motors 24v
    24v 800w PSU
    10m bungee chord
    x2 Pit bike chain
    x2 pit bike sprockets
    x2 adjustable anti roll bar with ball sockets
    x1 800mm prop shaft from a MGA

    Total spend so far: £268.84

    My budget is £300

    I'll be using ply and steel for the frame, This creation is going to live in my garage, So will try and keep the frame small and bolt it down

    Not sure if I'll need 24v batteries to help with surge? I've probably gone overboard with motor power.

    Attached Files:

    • Like Like x 2
  2. Ads Master

    Ads Master

    Balance:
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  3. tomkil192

    tomkil192 Member

    Joined:
    Jun 25, 2015
    Messages:
    62
    Location:
    Uk. London
    Balance:
    117Coins
    Ratings:
    +21 / 0 / -0
    My Motion Simulator:
    2DOF, DC motor, Arduino
    Great job. Can I ask you what type of seat are you using? it looks light and comfortable.
  4. Surferjo86

    Surferjo86 New Member

    Joined:
    Sep 24, 2019
    Messages:
    9
    Location:
    Sheffield
    Balance:
    90Coins
    Ratings:
    +5 / 0 / -0
    My Motion Simulator:
    2DOF, 3DOF, DC motor, Arduino, 4DOF, 6DOF
    Ah, the video isn't mine. It's what I'm basing my construction on.
    Joe
  5. Surferjo86

    Surferjo86 New Member

    Joined:
    Sep 24, 2019
    Messages:
    9
    Location:
    Sheffield
    Balance:
    90Coins
    Ratings:
    +5 / 0 / -0
    My Motion Simulator:
    2DOF, 3DOF, DC motor, Arduino, 4DOF, 6DOF
    Cobbled a rough looking seat together today, aiming for a spitfire(ish) cock pit. Need extra high sides for leg support side to side movement. I have some 50mm foam to pad the seat out, As I won't be sat on a parachute.

    I Might make the panel with flaps switch and fake clocks- just so in VR it feels like I'm in a cockpit.

    I'll also be making a spade grip flight stick, I've already made one and a spitfire throttle quadrant using Teensy. I'll be bolting the throttle onto the rig but will have to make a new flight stick and rudder pedal.

    Most of my parts have arrived today. Need to think about constructing something to attach the sprockets to the motors.

    Picking up 50mm x 30mm mild steel box section on Monday for the main frame

    Attached Files:

    • Like Like x 2
  6. Surferjo86

    Surferjo86 New Member

    Joined:
    Sep 24, 2019
    Messages:
    9
    Location:
    Sheffield
    Balance:
    90Coins
    Ratings:
    +5 / 0 / -0
    My Motion Simulator:
    2DOF, 3DOF, DC motor, Arduino, 4DOF, 6DOF
    Got some more done on the seat, Foot rest in place, Giant 400mm wheels cut out. I think they might be a little excessive.

    I got my angle iron today for the base and prop shaft supports

    Cost so far:
    anti roll bar £20.00
    ply £30.00
    prop shaft £30.00
    psu £68.24
    motors 400w x2 £70.00
    PCBs £25.00
    sprocket x2 £10.00
    chain x2 £26.00
    angle iron £30.00
    £309.24

    Hoping thats it apart from seat covering.I have some foam and potentiometers laying around.

    Attached Files:

    Last edited: Jun 15, 2020
  7. MarkusB

    MarkusB Active Member Gold Contributor

    Joined:
    Jun 30, 2015
    Messages:
    473
    Location:
    Germany
    Balance:
    3,534Coins
    Ratings:
    +474 / 1 / -0
    My Motion Simulator:
    2DOF, 3DOF, DC motor, Arduino, Motion platform
    Hi @Surferjo86,

    your wooden DIY seat and the foot rest look nice.

    I just have some concerns about these giant wooden wheels.
    They are probably meant for achieving huge roll & pitch angles, right? This is not always the best solution. Small and precise movements are often better and more convincing for our brains than large and inaccurate ones.

    People often think that a large pitch angle can simulate strong surge forces, but this is not always true. On the one hand your sense of balance notices large rotation movements, and on the other hand large movements need time, which may result in an offset between the image you see on the monitor and the movements you feel.

    But if you want to go on with your current approach, you should have in mind that the moving center of gravity and the inertia will produce quite some forces, and your build does not look very stable. For example have a look at the points that I have marked in the picture below.
    WeakPoints.png

    Your rig will probably wiggle a lot in all directions when the motors start moving, which will result in rather imprecise movements.
  8. Surferjo86

    Surferjo86 New Member

    Joined:
    Sep 24, 2019
    Messages:
    9
    Location:
    Sheffield
    Balance:
    90Coins
    Ratings:
    +5 / 0 / -0
    My Motion Simulator:
    2DOF, 3DOF, DC motor, Arduino, 4DOF, 6DOF

    I'm looking for 35-40 degrees - possibly even less depending on how it feels.

    The rig will be a steel frame 30x50 box section- This is just a mock up with wood screws and key hooks. It will be solid steel and bearings when I'm done.

    The arms are now half the length and will be mounted at the bottom of the seat.

    I intend on doing experiments with the wheels - started big so I notch it down to my liking.


    Thankyou for the interest and advice, The last thing I want to do is shake it apart or hurt myself!

    How many degrees of movement would you advise?
  9. brunoD

    brunoD New Member

    Joined:
    Jun 17, 2020
    Messages:
    11
    Balance:
    58Coins
    Ratings:
    +1 / 0 / -0
    My Motion Simulator:
    2DOF, Arduino
    Do you play assetto corsa with it ? I am impressed
  10. MarkusB

    MarkusB Active Member Gold Contributor

    Joined:
    Jun 30, 2015
    Messages:
    473
    Location:
    Germany
    Balance:
    3,534Coins
    Ratings:
    +474 / 1 / -0
    My Motion Simulator:
    2DOF, 3DOF, DC motor, Arduino, Motion platform
    Since you plan to use a VR headset, you should consider motion cancellation with this amount of rotation.

    Sounds good. I thought this wooden construction would be the final one. This was the reason for my concerns. :)

    This really depends on your personal preferences and what you want to achieve.

    In my opinion 35-40 degrees are rather large angles, but they can surely be fun for flight or rollercoaster simulations.

    I am following a different approach: rather small rotation angles plus g-seat paddles. One example for this approach is the Bergison G-Seat:
    • Like Like x 1
    • Agree Agree x 1
  11. Surferjo86

    Surferjo86 New Member

    Joined:
    Sep 24, 2019
    Messages:
    9
    Location:
    Sheffield
    Balance:
    90Coins
    Ratings:
    +5 / 0 / -0
    My Motion Simulator:
    2DOF, 3DOF, DC motor, Arduino, 4DOF, 6DOF
    Had abit of time to carry on with the project.
    Steel frame is pretty much done, just needs cleaning up and painting.
    3D printed my motors mounts, motors fit snug.

    Been concentrating on the flight controls, All integrated into the rig. Hoping to set up force feedback on flight stick and rudder pedals. using a old Thrustmaster with some more powerful motors and mosphets.

    Need to fabricate some mounts for the seat for the lever arms to attach next.

    Attached Files:

    • Like Like x 1