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just starting on my 6 dof flight sim project.

Discussion in 'New users start here - FAQ' started by bob golding, Mar 15, 2021.

  1. bob golding

    bob golding Member Gold Contributor

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    hi all, just getting started on my 6 dof project. progress so far. have sourced some motors I think may be suitable. geared wheelchair motors. around 250 watts 24 volts final drive speed around 150 RPM. Arduino uni. still deciding on the h bridges. I'm going down the route of building a small-scale version first as I work better that way. I have ordered some cheap DC geared motors and some l298 h bridges. still deciding on the feedback between pots or encoders. am I right in assuming the motors never travel over 180 degrees.? I decided on geared motors rather than linear actuators on the grounds of simplicity. Still need to work out the crank length to give me 25 degrees of roll. Not sure about pitch angle yet I'm new to flight sims so still learning to fly. any thoughts and ideas welcome. it's been a long time since I tackled anything this big but got a general idea. New to Arduino as well. i made a focus rail for my camera a while ago so got a rough idea of how to use Arduino. until something goes wrong that is! dyslectic so debugging code takes me a while. any thoughts and ideas welcome.
    bob golding, Mar 15, 2021
    #1
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    The effective use of torque by a lever falls off rapidly over about 38-40 degrees up and down, so in terms of efficiency about 80 degrees total. Over that can work, but adds significant strain on the motors.

    Lever length depends on a number f factors in design Vs physics, the good thing is that additional holes can easily be added to levers, but start with a sensible lever CTC of about 60mm and work from there.

    See the design resources here: https://www.xsimulator.net/community/faq/basics-6-dof-stewart-platform-design.280/

    And here https://www.xsimulator.net/community/faq/stewart-platform-leg-force-spreadsheet.375/
    noorbeast, Mar 16, 2021
    #2