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2dof Questions and Problems

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Giuseppe1, Sep 13, 2025 at 17:43.

  1. Giuseppe1

    Giuseppe1 New Member

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    My Motion Simulator:
    2DOF
    Hello, reading the forum I am trying to assemble my station. Everything works for now. The problem I can't solve is this: when the system is turned off, the lever arms point to the floor.So when I turn on the PC the arms do not return to horizontal position.this makes it impossible for me to sit because the seat remains tilted forward!! now I ask, how can I do to lock the arms in the starting position? For now I block the position at the front with two large wooden blocks.
    I attach some explanatory photos. Thank you.

    Attached Files:

    Giuseppe1, Sep 13, 2025 at 17:43
    #1
  2. michel123

    michel123 Member

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    My Motion Simulator:
    2DOF, AC motor, Arduino, Motion platform
    From memory, you correct this in the SMC3 profile. Basically, you must be exceeding the sinusoidal signal in SMC 3 in some way.

    You need to review the settings so that when you turn on your chair, SMC3 can find the position of your motor.

    To do this, check when you start it in the SMC software. If, when you turn on your motor, it exceeds the upper or lower limit, you have an incorrect gear/motor potentiometer ratio. This should create a continuous sinusoidal wave that alternates between high and low.

    I'm not sure I explained this correctly...
    michel123, Sep 13, 2025 at 20:48
    #2
  3. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Yours are obviously motors that can be back driven, meaning they can be moved when unpowered.

    The wooden chocks you are already using are the easiest solution and many before you have done the same.

    Keep in mind the controllers shutting off if out of range is a safety feature, for you and your rig.
    noorbeast, Sep 14, 2025 at 02:40
    #3
  4. Giuseppe1

    Giuseppe1 New Member

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    My Motion Simulator:
    2DOF
    Thank you for your comments. I apologize if I worried about one obvious thing but, not being a native English speaker, I definitely missed this thing. I'm glad it's normal, so I found a more elegant locking system than wedges!! finally, I decreased a little bit max limit So as to resume the engines without getting up to move the station. Thank you very much, if other problems arise
    • Like Like x 1
    Giuseppe1, Sep 14, 2025 at 14:23
    #4