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Question Front of rig dropping

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Hell167, Sep 8, 2023.

  1. Hell167

    Hell167 New Member

    Joined:
    Aug 9, 2023
    Messages:
    21
    Balance:
    117Coins
    Ratings:
    +5 / 0 / -0
    My Motion Simulator:
    DC motor, Arduino
    Hi I'm new here. Dove right in and started welding together my rig frame for a 3dof sim.

    I'm at the point where I've just installed 2 motors into the front and hooked up the 2 arms.

    So I had the arms sitting at 90 degrees while the rig is leveled tightened everything. But once I removed the items I was using to support the rig the motors turned to the lowest position and the front dropped. This is without power yet and I'm not at the stage to power it yet. The motor placement is in the front of the rig

    My motors are 50:1 12v 120rpm

    Is this normal? Is the rig supposed to have the front dip down when powered down? Did I buy the wrong type of motor? Only thing I can think of is maybe I measured wrong and have the univeral joint too far back.

    Any help would be greatly appreciated.
    Hell167, Sep 8, 2023
    #1
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
    Jul 13, 2014
    Messages:
    20,771
    Occupation:
    Innovative tech specialist for NGOs
    Location:
    St Helens, Tasmania, Australia
    Balance:
    146,474Coins
    Ratings:
    +10,816 / 52 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    Motors moving when unpowered is called being back driven, what really matters is if they can hold and control the mass of the rig when powered on.

    Can you please add more detail, such as the full specs of the motors, pictures of the rig and what specifically was used for construction.

    I don't know the full specs of what you have but in my experience 200w 50:1s can't be back driven when new, but can be after they are used for a while.

    An unbalanced rig can be an issue, but it is important that balance is determined with you in it and all peripherals attached: https://www.xsimulator.net/communit...-of-gravity-to-balance-a-motion-simulator.55/
    noorbeast, Sep 9, 2023
    #2
  3. Hell167

    Hell167 New Member

    Joined:
    Aug 9, 2023
    Messages:
    21
    Balance:
    117Coins
    Ratings:
    +5 / 0 / -0
    My Motion Simulator:
    DC motor, Arduino
    The rig is all metal. Haven't finished building it yet. The motor specs as follows

    50:1 ratio
    12 volts
    120rpm at no load
    16kg/cm torque at load
    72kg/cm torque stall
    12amps
    Hell167, Sep 9, 2023
    #3
  4. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
    Jul 13, 2014
    Messages:
    20,771
    Occupation:
    Innovative tech specialist for NGOs
    Location:
    St Helens, Tasmania, Australia
    Balance:
    146,474Coins
    Ratings:
    +10,816 / 52 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    noorbeast, Sep 9, 2023
    #4