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Question Suggestions on how to balance my Rig

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by TheYellowBatman, Apr 5, 2021 at 17:02.

  1. TheYellowBatman

    TheYellowBatman New Member Gold Contributor

    Joined:
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    My Motion Simulator:
    2DOF, DC motor, Arduino
    It was pretty clear when replacing a burnt wormdrive motor one one side of my rig that it is not balanced well left to right and front to back. It definitely is much heavier on the left side which is the motor which burnt out (black coils, melted plastic inside.. the works). After repairing the sim and solving some wiring issues the left motor is getting hot after 1-2 laps on assetto corsa while the right motor is nice and cool. After searching the forums it is evident that balance is very important for wiper motors and this imbalance to the left could be overloading the left motor.

    The frame is steel box tube that was built by someone else. I suspect the additional steel on the left side to hold the control box and wheel mount has added to the imbalance to the left. The shifter and aluminium plate it is bolted too would also contribute a bit.

    The seat, and pedals are basically centre however the Uni join is just offcentre to the right by 5mm. Unfortunately this is not easily moved 5mm left as the new hole I would drill would essential join to the existing one!

    Any suggestions on the best way to balance this particular design while still taking into account functionality and not redesigning the whole thing?

    Attached below are SimCalc screenshots, photos of the rig and a video of it in motion.



    sim11.jpg sim12.jpg sim13.jpg simcalc1.jpg Simcalc2.jpg
  2. Ads Master

    Ads Master

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  3. T R Para

    T R Para i make stuff up Gold Contributor

    Joined:
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    Occupation:
    Retired
    Location:
    Cincinnati, Oh
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    +322 / 2 / -0
    My Motion Simulator:
    AC motor, 6DOF
    One thing you can try is to use a bathroom type weighing scale.
    Prop up 3 of the legs evenly to the height of the scale. Place the scale under the 4th leg and record the weight displayed with you sitting in the rig. Move the scale around to all 4 corners and record the weights.
    There is a mathematical calculation you can make to show exactly where the CG is presently.
    I have used this in the model airplane hobby to find the CG balance point with great success.
    I do not remember the formula used right now but in your instance it probably not important.
  4. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
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    Innovative tech specialist for NGOs
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    St Helens, Tasmania, Australia
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    119,803Coins
    Ratings:
    +9,531 / 47 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK