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2Dof Project

Discussion in 'DIY Motion Simulator Projects' started by Retro77, Apr 14, 2018.

Page 4 of 4
  1. Retro77

    Retro77 Member

    Joined:
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    Occupation:
    Nurse Practitioner
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    +36 / 0 / -0
    My Motion Simulator:
    2DOF, DC motor, Arduino
    I'll try to get a video uploaded in the next week. Cheers. Thanks again for your assistance.
    • Like Like x 1
    Retro77, Jun 25, 2018
    #61
  2. Retro77

    Retro77 Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino


    Video of my project . May use longer 50mm levers I made. 38mm right now. Still fun as hell.
    • Like Like x 2
    Retro77, Jun 28, 2018
    #62
  3. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Great to see your rig in action :thumbs

    Just a comment for your consideration. With a lever its effective use of torque range is about 40 degrees up and down and a lever is most effective at 90 degrees to what it is acting on. Think of it like a door, it is easy to push open when you are at 90 degrees to it, but it is very inefficient if you pushed the edge of the door at zero degree.

    Your lever is actually rotating over the top, much like pushing on the edge of the door, which is not really efficient and will put stress on the motors.
    • Agree Agree x 1
    Last edited: Jun 28, 2018
    noorbeast, Jun 28, 2018
    #63
  4. Retro77

    Retro77 Member

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    Occupation:
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    My Motion Simulator:
    2DOF, DC motor, Arduino

    I set the motors up with a square along the rod. Lever to rod should be pretty much at 90 degrees. Is there a setting I'm missing?
    Retro77, Jun 28, 2018
    #64
  5. MarkusB

    MarkusB Well-Known Member Gold Contributor

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    My Motion Simulator:
    2DOF, 3DOF, DC motor, Arduino, Motion platform
    This may be true for the neutral position of the motors, though it is hard to see in the video.
    However, the movement angles of the motors are very large (seems to be more than 90 degrees per direction).
    One setting you could try is Axis Limiting in the Game Engine.
    If you feel that you have too little seat movements after limiting the angles, you can surely increase the lever length. Wheel chair motors have plenty of power, especially for a shoulder-mounted seat mover.
    MarkusB, Jun 28, 2018
    #65
  6. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    I suggest you check your SMC3 settings.
    noorbeast, Jun 28, 2018
    #66
  7. Retro77

    Retro77 Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    I ended up setting the axis limit to 80 percent and it's fine now. I really can't find a sweet spot in the SMCS settings. Do I need a pwmmin and rev? Is kd ks important? I find as soon as I adjust something my sabertooth kicks off. Right now I have my kp at 200 and PWMmax at 150. Everything else at 0. Seems to.work and sabertooth stays on. Not sure if it's the best settings? Not sure why my sabertooth shuts down?
    • Funny Funny x 1
    Retro77, Jul 3, 2018
    #67
  8. Retro77

    Retro77 Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    Well I think I may have solved my issue. Looks as if my power supplies are going into a protect mode now and again. The fans remain on though so I didn't think anything of it. I have two hp 600 DPS supplies in series. Anyone have a suggestion for a good quality 24v power supply that will handle my wheelchair motors?
    Retro77, Jul 3, 2018
    #68
  9. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    +10,781 / 52 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    You should find plenty of choices for 24V LED strip light PSUs on Ebay or Amazon, which should be a pretty economical and reliable way to go.
    • Winner Winner x 1
    noorbeast, Jul 3, 2018
    #69
  10. Retro77

    Retro77 Member

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    Occupation:
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    My Motion Simulator:
    2DOF, DC motor, Arduino
    Ended up getting 2 12v gel batteries that came out of the same wheelchair my motors were from. I'll try these with my server PSU for now and see how it goes. Also got the 24v charger as well. I'll keep everyone updated with my tests.

    Attached Files:

    Retro77, Jul 5, 2018
    #70
  11. Retro77

    Retro77 Member

    Joined:
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    Occupation:
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    My Motion Simulator:
    2DOF, DC motor, Arduino
    Well the batteries worked quite well. I used the rig for a couple hours and the batteries were at 85 percent when done. I put the charger on for the night. May not run a power supply with them. They seem to be fine on their own.
    • Like Like x 2
    Retro77, Jul 6, 2018
    #71
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