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Project #2: A 2dof using 4motors & 2 ujoints

Discussion in 'DIY Motion Simulator Projects' started by james wheeler, Sep 30, 2014.

  1. james wheeler

    james wheeler Active Member

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    My Motion Simulator:
    2DOF, Arduino
    I am embarking on my second project. A theory, to produce a lateral mover with roll and she sway. On my first I didn't like how acceleration and braking felt. I wanted to be moved forward and back not tilted. So I will connect at the four corners of my seat.
    james wheeler, Sep 30, 2014
    #1
  2. bsft

    bsft

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    interesting. Got a design or sketch?
    • Agree Agree x 1
    bsft, Sep 30, 2014
    #2
  3. Mazhar Salam

    Mazhar Salam Member

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    My Motion Simulator:
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    me too want to see a design - how in the world r u going to impliment 2 U Joints in a single simulator. will be waiting:thumbs
    Mazhar Salam, Sep 30, 2014
    #3
  4. eaorobbie

    eaorobbie Well-Known Member SimTools Developer Gold Contributor

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    My Motion Simulator:
    2DOF, DC motor, JRK, SimforceGT, 6DOF
    mmm X-Y table like a cnc mmm ???
    With Roll , Pitch unit on top of it. ? Would be my way of thinking.
    mmmmm please tell us more, sounds interesting.
    eaorobbie, Oct 1, 2014
    #4
  5. james wheeler

    james wheeler Active Member

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    My Motion Simulator:
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    Mabey a better explanation. In exploring how i felt while having my neighboor race me around in his suburu then compairing it to my 1st sim I noticed a few things i wanted to try and emulate.
    1rst on sim1 i used a cv joint and its pivit or joint was located about 75 % up the shaft.thia made the seat feal as though it was falling over when leaned. The suburu made me feel swung not tipped so Sim2 i wanted to put the pivot close to the bottom. in order to swing the chair more.
    2nd I want to desinguate between sway/surge and roll/pitch. so two seperat drives. and two drive will require two ujoints. i want to feel the tilt of a roll while being swung by the sway.
    james wheeler, Oct 2, 2014
    #5
  6. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    Perhaps a sketch would help convey your ideas. Your description sounds to me like a traditional 3DOF which includes a front pivot for sway, but perhaps I am missing what you mean.
    noorbeast, Oct 2, 2014
    #6
  7. james wheeler

    james wheeler Active Member

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    My Motion Simulator:
    2DOF, Arduino
    Day 1 pictures:

    Attached Files:

    james wheeler, Oct 2, 2014
    #7
  8. james wheeler

    james wheeler Active Member

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    My Motion Simulator:
    2DOF, Arduino
    The motors are from. Ford explorers. The seat is from a hyundai tiburon. The framing is from a old 10x10 cloth Gazebo. Which saved me a lot of welding time. I have a local metal shop cut me a 17x24 inch plate. The sub and audio control is for vibration effects. And the shaft is. 2 socket 1/2" drive u joints connected with a 5" extension. For easy disconnect. All parts are local and can be replaced fast.
    james wheeler, Oct 2, 2014
    #8
  9. bsft

    bsft

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    can you do something with pencil and paper and scan it?
    • Winner Winner x 1
    bsft, Oct 2, 2014
    #9
  10. james wheeler

    james wheeler Active Member

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    My Motion Simulator:
    2DOF, Arduino
    No sway motion, that might come on sim 4 after sim 3 heave.
    Here's a quick sketch on what I mean by dual ujoint for motors. Motors 2 will be located very close to the ujoint shaft and connected to the upper frame rail in hopes to give the ujoint on top more support until needed. It will be slightly ahead of it though. Motors 1 will be at the back and on the lower rail. Hopefully most of their effects will be directed at the lower joint.

    Attached Files:

    james wheeler, Oct 2, 2014
    #10
  11. bsft

    bsft

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    yep, got ya there now. Thanks for the drawing.
    Problem I can see is when surge motor goes down, unless you program some movement into the sway motor, its going to pull against it. Causing motor problems.
    Maybe put sway motors on the top frame and keep surge motors on bottom, then they work independently of each other and do not conflict each other.
    bsft, Oct 2, 2014
    #11