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Mack's 2dof flight chair build

Discussion in 'DIY Motion Simulator Projects' started by mackbot, Feb 9, 2018.

  1. mackbot

    mackbot New Member

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    Hi guys/gals just joined today! I started planning out my first motion seat. decided to try using some 12/24v actuators. They haven't arrived just yet so cant plan everything out just yet, but have made a rough model in blender to test out my idea for how the seat will function. They were cheap on ebay so if they don't work I'll probably end up using wiper motors like most other people seem to have.

    I plan on using an arduino as a controller with monster moto driver boards. I have a high amp 12v power-supply that went to an old arcade machine that I plan on using for the motors.

    The seat will be an old desk chair most likely until i can afford a better one to replace it.

    The frame and base will be made of wood for the time being.

    Will be updating this as my build progresses.

    let me know what you think!

    Attached Files:

    mackbot, Feb 9, 2018
    #1
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    noorbeast, Feb 9, 2018
    #2
  3. mackbot

    mackbot New Member

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    Hmm might be a bit on the slow side don't know much about the long one for the front. The two for the side go at .5"/s according to the seller. Might be able to change that by adjusting some of the gearing.
    mackbot, Feb 9, 2018
    #3
  4. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    .5"/s = around 12.5mm/s, that is way too slow for motion simulation where at a minimum you want at least 100+ times that speed.
    noorbeast, Feb 9, 2018
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  5. mackbot

    mackbot New Member

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    Hmm might change the design to wiper motors then. Will have to do some research since I don't know what type to get.
    mackbot, Feb 9, 2018
    #5
  6. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Have a play with SimCalc to get an idea of the physics: https://www.xsimulator.net/communit...e-linear-speed-and-forces-of-your-design.270/

    Keep in mind that disregarding mechanical loss, to know what Newtons it will take to move something it will be Mass (kg) x Acceleration (m/s) = F (N). So to move 100kg at 0.7 m/s needs 70 N. It takes 9.8N per kg to counteract gravity. There is significant mechanical loss in things like a worm gearbox, depending on the ratio you may want to allow between 10% to 50% loss for worm gears and the greater the gear ratio the higher the % loss is: http://www.meadinfo.org/2008/11/gear-efficiency-spur-helical-bevel-worm.html
    • Informative Informative x 1
    noorbeast, Feb 9, 2018
    #6
  7. mackbot

    mackbot New Member

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    Unfortunately the actuators will be way too slow. The side ones still move at a decent speed and might work better if over volted a bit but probably won't last under those conditions. The front actuator won't be usable at all. A friend of mine has some old truck wipers he said he'd let me have so I'll see how strong they are once I have them. Will definitely have to redesign my build though.
    mackbot, Feb 14, 2018
    #7