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Dimensions of a 2DOF motion platform for SimCalc

Discussion in 'DIY Motion Simulator Projects' started by imajavaid, Nov 16, 2021.

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  1. imajavaid

    imajavaid Member

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    My Motion Simulator:
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    I was planning create a rig inspired by this design made by 2DoF reality. I looked up for its dimensions on xsimulator and other youtube review videos. I was planning to calculate the required torque and forces on the platform using simcalc
    Can anyone kindly guide me about its complete dimension. Or is there any thread in the community where I could found the required data

    frame2.PNG


    Im using 200w 50:1 warm gear motors. I know the motor torque, speed, current angle and motor angle

    How I can calculate the CTC rest angle and Maximum deflection angle(to input in simcalc) before the physical prototype. Is there any method to calculate it or it has to be measured after the manufacturing part
    I also needed to be sure can my motors be able to lift 120kg of load. and what values of geometry parameters can provide me 12 degrees of roll and pitch. For that scenario I wanted to input geometry parameters into the simcalc
    Last edited by a moderator: Nov 16, 2021
    imajavaid, Nov 16, 2021
    #1
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    Keep in mind adequate torque is really important with a compact design, personally I use 200w motors with 60:1 wormdrives on my compact rig.

    At rest the connecting rods should be at 90 degrees to what they push, depending on design on a compact rig that is often the level seat base, and that usually means the levers are parallel to the seat base.

    On a compact design the motors and levers should be at the maximum distance from the pivot point as the design allows, as that increases inherent design leverage.

    The CTC depends on the design, load and motors, but will likely end up being around 40-60mm, and with levers it is easy to start at a smaller CTC but allow room for additional larger CTC holes, or make them with those 3 options.

    The pivot to lever connection is about 250mm on my compact rig with 50mm CTC levers driven by 200w motors and 60:1 wormdrives. My compact rig can handle loads greater than what you plan:

    noorbeast, Nov 16, 2021
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  3. imajavaid

    imajavaid Member

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    My Motion Simulator:
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    What is the justification behind using 200 W 60:1 motors. Though I understood the motors have high torque and most of the community is using these motors. But even before finalizing the dimensions of the design . How you can calculate the determine the required torque that will be generated to move the rig

    Moreover, how can determine the roll and pitch degree of freedom. Will the design be able to generate 12 degrees of roll and pitch movement.
    imajavaid, Nov 17, 2021
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  4. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    These days you have the benefit of handy tolls like Motion Visualizer and SimCalc, which can help you figure out the tradeoffs in design Vs physics, and what is required to drive a rig at a desired level of performance.

    Back when I built my rig it was some maths plus trial and error.

    First can I question why the 12 degrees of roll and pitch movement?
    noorbeast, Nov 17, 2021
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  5. imajavaid

    imajavaid Member

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    My Motion Simulator:
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    my final aim is integrate Xplane with VR glasses and motion platform.
    Initially I'm on the design phase of the motion platform.
    Regarding your question, virtual reality literature explicit that you require at least 10 degrees of movement to make the virtual experience realistic. Considering some design inefficiencies I decided to take it to 12 degrees.
    imajavaid, Nov 17, 2021
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  6. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    With VR in my view the most important criteria when it comes to motion is speed and accuracy of movement.

    With a compact rig the other key criteria is adequate torque to do that, with about 38-40 degrees up and down on the lever about the maximum range for effective torque utilisation, it drops off rapidly over that.

    According to SimCalc my compact rig tops out at 14.32 degrees for pitch and 12.47 degrees for roll at its max settings, though the reality is that most of the time you are using a portion of that, particularly in VR, unless in a flight sim doing a roll or loop.
    noorbeast, Nov 17, 2021
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  7. imajavaid

    imajavaid Member

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    Thanks @noorbeast for your kind help. After spending some time on it I have come on to these results. I can achieve required degree of motion with these parameters

    Accuracy is the most important thing when it comes to VR. I think the delay time of simtools is minimal and there will be almost zero lag between Xplane and motion platform


    111.PNG
    imajavaid, Nov 17, 2021
    #7
  8. imajavaid

    imajavaid Member

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    I want to quote equations through which I have calculated maximum pitch and roll angles. Is there any thread available in literature that explains the basic set of equations running behind simcalc?
    imajavaid, Nov 24, 2021
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  9. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    noorbeast, Nov 24, 2021
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  10. imajavaid

    imajavaid Member

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    My Motion Simulator:
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    Can you provide me link from where I can buy online the power supply of 200 W 60:1 worm gear motors
    imajavaid, Nov 24, 2021
    #10
  11. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    I use 3 modified HP server PSUs, as size wise they fitted my design: https://www.xsimulator.net/communit...ver-power-supplies-as-cheap-powerful-psus.54/

    But in many respects LED/Mean Well PSUs are a better option, as they are not as sensitive to the power spikes our rigs generate in fast reversals.

    The are lots of online suppliers and spec choices, the cheapest tend to have the longest wait if they ship out of China.
    noorbeast, Nov 24, 2021
    #11
  12. imajavaid

    imajavaid Member

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    For those who are interested in building a 2 DoF motion platform capable of lifting 110 kg (more depends on torque arm). A detailed list of required components along their part number and their cost is attached below

    11.PNG
    imajavaid, Dec 7, 2021
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  13. imajavaid

    imajavaid Member

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    Are they available on digikey and mouser online buying platform?
    Can you provide me any online link where I can buy them within a week while sitting in england
    imajavaid, Dec 27, 2021
    #13
  14. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    Motor availability depends a lot on where you are geographically, here in Australia we have Motion Dynamics as a good supplier. You really need to get advice from other UK members about suppliers there, as shipping can be a killer. Alternatively look for wheelchair motors on the likes of Ebay.
    noorbeast, Dec 27, 2021
    #14
  15. imajavaid

    imajavaid Member

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    Received my motors today:grin
    imajavaid, Feb 1, 2022
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  16. imajavaid

    imajavaid Member

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    These are the specifications of my motor

    Attached Files:

    imajavaid, Feb 1, 2022
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  17. imajavaid

    imajavaid Member

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    Got my complete set of hardware
    imajavaid, Feb 7, 2022
    #17
  18. imajavaid

    imajavaid Member

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    Universal joint

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    imajavaid, Feb 7, 2022
    #18
  19. imajavaid

    imajavaid Member

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    Position encoder

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    imajavaid, Feb 7, 2022
    #19
  20. imajavaid

    imajavaid Member

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    S-500 24 power suppply

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    imajavaid, Feb 7, 2022
    #20
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