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DIY 2DOF home build

Discussion in 'DIY Motion Simulator Projects' started by Alexey, Sep 26, 2014.

Page 3 of 5
  1. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    That is really coming together now.

    Great job on the pedals they look amazing and from what you describe work a treat :thumbs

    How thick is the lever arm off the motors? It looks around 5mm, but the photo is a bit blurred. These take a fair bit of a beating and need to be robust, particularly in longer lengths.
    noorbeast, Mar 20, 2015
    #41
  2. Alexey

    Alexey Well-Known Member

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    Cheers!

    It's 5mm steel bar, I used 8mm bar last time and thought it might be overkill so I decreased the size. I certainly can't bend them by hand but I'll just have to wait and see how they respond to the hammering that they shall receive. Yeah I only noticed the blur after I uploaded to my computer and it was too late to take another pic as it was dark by then.
    Alexey, Mar 20, 2015
    #42
  3. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    See how it goes. I don't think 8mm is overkill, that is what I used and mine are much shorter.
    noorbeast, Mar 20, 2015
    #43
  4. GIB SimRacing

    GIB SimRacing Active Member

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    My Motion Simulator:
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    Nice progress!
    What size is the RHS for the base frame? Will this be strong enough to prevent any flexing?
    GIB SimRacing, Mar 20, 2015
    #44
  5. Alexey

    Alexey Well-Known Member

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    My Motion Simulator:
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    What length are you using and what motors do you have? I can't seem to find a link you your simulator to scavenge info. I'd like to know as I have 12V 200w 60:1 motors and I'm not sure how they will handle the sim at this stage.

    @GIB The RHS is 30x30x3mm steel, it's surprisingly stiff for the size of the frame. I might have to add two pieces that cross the frame from the motor mounts to the drive shaft if I see any flex in the frame.
    I should have probably done so beforehand but there's that hindsight striking again.
    Alexey, Mar 20, 2015
    #45
  6. GIB SimRacing

    GIB SimRacing Active Member

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    My Motion Simulator:
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    See how it goes. 3mm might be sturdy enough. Only one way to find out for sure. Hopefully you won't have to add extra support.
    I'm looking forward to seeing the rig in action.:thumbs
    • Agree Agree x 1
    GIB SimRacing, Mar 20, 2015
    #46
  7. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    You can find my sim here: http://www.xsimulator.net/community/threads/dx-racer-compact-simulator.5866/

    I run 12V 200w 60:1 motors and have far less leverage than your shoulder mount. They will easily toss you around, no problem at all.
    noorbeast, Mar 20, 2015
    #47
  8. Alexey

    Alexey Well-Known Member

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    Cheers noorbeast,

    I suppose I'll just have to see what happens then. For science!
    • Like Like x 1
    • Agree Agree x 1
    Alexey, Mar 20, 2015
    #48
  9. prodigy

    prodigy Burning revs

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    My Motion Simulator:
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    On this photo there are some visible inaccuracies in motor positions, I don't know if that's because of photo angle but it shouldn't be that much distorted anyway. Looks like the back bar of the frame is not welded at 90 degrees, I don't know, it doesn't look right and if there are differences in motor position - one motor being further away from center than the other motor, you could find yourself in trouble with symmetrical movements and making profiles. Do the measurement again and see if the motors are positioned evenly and symmetrical, maybe I am wrong.

    IMG_0440_edit.jpg
    • Agree Agree x 1
    prodigy, Mar 20, 2015
    #49
  10. Alexey

    Alexey Well-Known Member

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    The center mount is on a pivot not the external frame. This is because I made a mistake in keeping alignment on the driveshaft when I welded it. The angle is there to counteract that misalignment.
    Alexey, Mar 20, 2015
    #50
  11. Nick Moxley

    Nick Moxley Well-Known Member

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    My Motion Simulator:
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    im Confused, So you Purposely welded it out of square ? Why not just fix what the problem is ?
    Nick Moxley, Mar 20, 2015
    #51
  12. RacingMat

    RacingMat Well-Known Member Gold Contributor

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    +1
    -1
    =0

    He made a second mistake to correct the global system ;)
    RacingMat, Mar 20, 2015
    #52
  13. Alexey

    Alexey Well-Known Member

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    Because fixing it would have taken an hour to do whereas welding it on a corrected angle took 5 minutes. My laziness wins 100% of the time :)
    • Funny Funny x 1
    Alexey, Mar 21, 2015
    #53
  14. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    That may very well come back to bite when you have odd geometry and are trying to create motion profiles which will also need to compensate.
    • Agree Agree x 1
    noorbeast, Mar 21, 2015
    #54
  15. Alexey

    Alexey Well-Known Member

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    Also just for clarification because I didn't actually address the query, the motors are square to the bottom frame as well as the top frame. The only thing out of square is the two parallel bars supporting the top frame.
    Alexey, Mar 21, 2015
    #55
  16. Alexey

    Alexey Well-Known Member

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    Extreme weight saving.
    [​IMG]
    • Funny Funny x 1
    Alexey, Mar 25, 2015
    #56
  17. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    It is worth getting it square, frustrating though that may be in terms of time and extra work...we all live and learn.
    • Agree Agree x 3
    noorbeast, Mar 25, 2015
    #57
  18. Scratch

    Scratch Active Member

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    Ooh, awesome stuff. Your pedals look fantastic!
    Scratch, Mar 25, 2015
    #58
  19. Alexey

    Alexey Well-Known Member

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    Thank you scratch,

    If I'm starting over........
    [​IMG]

    Front yellow box is 150Kg chair swivel, back yellow blocks are conveyor style roller bearings.
    The new design should fit under a standard desk (this is just a back of the envelope sketch), steering wheel will be detachable so that it can be used like a desk racer or stand alone. Foot pedals will move with the rig.
    Bottom frame will be move back slightly for balance, or extension arms made for compactness.

    This was somewhat forced on me as the space I had for the original rig is now being taken over by my track car.
    • Like Like x 1
    Alexey, Mar 26, 2015
    #59
  20. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    Nothing like a fresh start, I did that also.

    Any reason not to bring the base frames back basically level with the back of the seat? I would think it would give better mount support for the motors and better stability for the rig itself, as otherwise your weight when lent back is past the back of the frame.
    • Agree Agree x 1
    noorbeast, Mar 26, 2015
    #60
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