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2dof Motion Motorcycle wheelchair motors Help

Discussion in 'Motor actuators and drivers' started by 204flightsinmotion, Oct 1, 2025 at 03:36.

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  1. 204flightsinmotion

    204flightsinmotion New Member

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    First time building a motion simulator and I decided to do something weird. I have been building arcades for 6 or 7 years so I’m quite familiar with software and building things but I’m new to Motion.
    I bought a Kawasaki Ninja and stripped it completely and am only putting back what I need.
    The issue I’m having is I decided to go with 2 wheelchair motors. Same model I saw some other people using. 24v. I mounted them and as soon as I drop my jack the thing immediately drops forward. Before I mounted the u joint I made sure to find that middle balancing point with me sitting on the bike. So with me not on the bike and the motors off it immediately drops forward.
    Any advice is appreciated. I am attaching a pic of where I’m at so far.

    I have not finished wiring it up yet, I wanted to make sure the mechanical side of things looks good before I move on.

    Thank you for any advice.

    [​IMG]

    [​IMG]

    [​IMG]
    204flightsinmotion, Oct 1, 2025 at 03:36
    #1
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    What you are describing is that the motors when unpowered can be moved easily, which is called being back driven, and relates to the gear ratio used plus design.

    Using pivoting chocks under the levers is the simplest way to support a rig when unpowered, a bike version of that could be the already existing kick stand.

    Just an observation, with respect to design your motor placement so close to the pivot means there is little inherent design leverage, exacerbating the ease to which the motors can be back driven.

    You could consider moving the motors to the back of the frame, which would greatly reduce the strain on them.

    Tools like SimCalc let you explore the tradeoffs between design Vs physics: https://www.xsimulator.net/communit...e-linear-speed-and-forces-of-your-design.270/

    As an aside, do check out @Chris_Beeves rig for inspiration: https://www.xsimulator.net/community/threads/motorcycle-4-dof-motion-sim.16530/
    noorbeast, Oct 1, 2025 at 04:47
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  3. 204flightsinmotion

    204flightsinmotion New Member

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    Thanks so much for your quick response. Given the photos I sent would you recomend moving the motor mounts to the back silver area where the wheel use to mount. Or go even fsrther to the top back of the frame above the tail lights.
    Again thanks for the advice.
    204flightsinmotion, Oct 1, 2025 at 14:56
    #3