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RiftFlyers 6DOF Platform

Discussion in 'DIY Motion Simulator Projects' started by RiftFlyer, Apr 22, 2014.

  1. trent

    trent New Member

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    My Motion Simulator:
    DC motor, 6DOF
    link to gearhead specs http://www.animatics.com/products/g...ce-planetary-gearheads/hp-nema-34-series.html
  2. RiftFlyer

    RiftFlyer Active Member Gold Contributor

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    @BlazinH

    Thanks for the clarification. It's a shame the unit doesn't have the ability to dial in a little deadband or filtering on the signal line.

    @trent

    Thanks for the links. I hadn't watched that video in a long while. I'd say some of the dev guys here might be able to get them working. You should check if they accept a PWM signal. They may be able to behave like a typical RC servo. Sadly they are way beyond my budget so I won't be researching them. Let's hope that oculus mod works out ;-)
  3. trent

    trent New Member

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    Last edited: Apr 25, 2014
  4. bsft

    bsft

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    huh?
  5. RiftFlyer

    RiftFlyer Active Member Gold Contributor

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  6. BlazinH

    BlazinH Well-Known Member

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    Have you looked into DEScribe software that you can download free from Dimension Engineering? With it you can set a deadband and modify a whole slew of other values.
  7. RiftFlyer

    RiftFlyer Active Member Gold Contributor

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    I haven't. I'm still waiting on my sabertooth and kangaroo to arrive.

  8. BlazinH

    BlazinH Well-Known Member

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    You can still download it now and run it to get familiar somewhat. Then you'll be a step ahead when it arrives! ;)
  9. trent

    trent New Member

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    Last edited: Apr 26, 2014
  10. RiftFlyer

    RiftFlyer Active Member Gold Contributor

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    @trent

    There doesn't seem to be any gearing on those motors you've linked to.

    I'd be looking more at the 4886 for a flight sim platform. It can also take an encoder. That's after just having a quick look around the site. Prices are huge though.

    https://www.bodine-electric.com/Asp...Series+Parallel+Shaft+DC+Gearmotor&Model=4886

    I'm a total noob to this so make sure to get loads of opinions from more experienced forum members before purchasing anything. I'm a student here not a teacher ;-)
  11. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    DC motor, Motion platform, 6DOF
    The prices are more than huge, there is a minimum buy quantity for any motor starting with a 'N' in its part number.
  12. shanothegreat

    shanothegreat Member Gold Contributor

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    My Motion Simulator:
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    I am keenly watching your progress with respect to keeping the weight down by removing the monitor weight from the platform.

    Just out of interest the motor speeds and torque figures are for a 24v motor are they not?
    Currently I'm running 12v dc truck wiper motors at 14v via a calcium battery/charger power supply and two Jrk12v12's on 60mm arms with great speed.
    I went up 10mm on the arm length as I was concerned that the output rpm was a little low for the more popular 50mm arm length used by many others here. This small increase gave me a greater radial speed ie the bigger arc it transcribes means it covers a greater distance for a given rpm hence higher speed.

    Now applying this concept to your 6 dof platform
    means that as the back goes down and the front goes up relative to the c of g the perception of actual movement will be double that of the given speed of a single actuator.

    Have a look at any of the 6dof sims on youtube and you will see that the platform moves quite quickly compared to actual actuator movement.

    As for actual travel distance this only comes into effect for long and sustained accelerations. I understand you are bulding a flight sim and this may be an effect you are looking for. Myself I'm into driving sims and it is more the change indirection that requires faster movement. Test this next time you drive a car with gusto, the car moves you quite quickly left and right and back and forward generally not licking the glass for half a minute on the drivers side window.

    Remember what we are building is a simulator and unless we mount a seat at the end of an industrial robot running at 2000 hp we won't get close to real world forces.

    With respect to the Oculus Rift I can see the gyrosopic head tracking being an issue in a motion sim. I understand that the DV kit2 has head tracking similar to track ir as well. If this is the case I would suggest turning off the gyrosopic sensor and have a camera fixed to the platform that moves with the driver/pilot and tuned to elimates small vibration movements.

    Good luck and aim to keep the weight down with the build.
    • Agree Agree x 1
  13. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    My Motion Simulator:
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    Turning off any of the Rift tracking capability is likely to subject the user to VR sickness, see here for more about the inherent challenges of VR and motion simulators: www.xsimulator.net/community/faq/virtual-reality-and-motion-simulators.115/
  14. bruce stephen

    bruce stephen Hammer doesnt fix it, must be electrical

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  15. momoclic

    momoclic Active Member

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