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Seattime's Sims

Discussion in 'DIY Motion Simulator Projects' started by SeatTime, Mar 8, 2018.

  1. Pierre Lalancette

    Pierre Lalancette Sir Lalancelot Gold Contributor

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    My Motion Simulator:
    DC motor, Arduino, 6DOF
    You have a controller on your rig to remove its movement? I was not following that area much lately and I didn`t know they were advancement in that regard.

    But, let's not highjack Seatime thread. Great movement from you sim SeatTime. Everyone seams to be moving away from the arduino controllers. I'm getting way behind on sim production lately.
  2. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    AC motor, Arduino, Motion platform, 6DOF
    The PIMAX motion cancellation worked fine for me, just cannot stand the headset for long stints on the sim and my 4K monitor is also still a touch clearer. For short stints, VR is still nice for flight sims.

    The long screws let's me have smooth heave fidelity without clipping. I run heave at 80% of the actuator length.
    Last edited: Jun 18, 2021
  3. Eagletrike

    Eagletrike New Member SimAxe Beta Tester Gold Contributor

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    My Motion Simulator:
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    I was just curious to find out if you have accommodated for the simulation of Yaw in your setup? I really like your setup in conjunction with the ideal of applying the g forces via the seat as there is only so much force that can be applies via the limited travel of a motion platform, well done.
  4. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    AC motor, Arduino, Motion platform, 6DOF
    I will be simulating yaw forces (predominantly sway) via G systems.
  5. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    AC motor, Arduino, Motion platform, 6DOF
    Finally moved the AC servo controller/drivers into a nice enclosure - all earthed/ EMI filtered and mounted on the wall. Have room left to install three more drivers for G systems.

    AC servo control Enclosure1.jpg

    AC servo control Enclosure2.jpg
    • Winner Winner x 1
  6. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    AC motor, Arduino, Motion platform, 6DOF
    Slowly getting my workshop back in order, noted that fusion 360 has changed their Personal license yet again - Initially thought I had lost all my old files as they use to come up in the left panel, but was able to track them down. Have not investigated it too deep, but it seems that I can now have only 10 files editable.
  7. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    AC motor, Arduino, Motion platform, 6DOF
    I am currently yet again in Covid lockdown, so will try to explain the thoughts behind my new sim.
    Why not a 6 actuator stewart platform? Nothing against them, but I have owned one and ease of access is not good, with allot of my friends never able to get into it. Also as I wanted to move away from DC motors, could see a better way to use the required new 6 AC actuators.
    Why 3 and not four Actuators for motion? Cost and I see no advantage in using 4, plus there are no issues with calculating ground touch points which is the case for a 4 actuator system.
    Fixed mounted actuators with rails for adjusting for motion? Less inertia (my actuators are seriously heavy), as only a small part of the actuator actually is in motion. Means less unwanted vibration, which can be a issue in any motion system.
    Both end supported Ball-screws with separate linear sliders supporting the weight of the Rig. No issues with screw distortion with varying weight loads or whipping at high speeds (especially for long screws like I have). These can cause resonance/vibrations of the actuator in operation. Also the height of the sim can be much lower even with long screws.
    Why AC servo motors? No brainer/very powerful/almost plug-play for any sim that needs to carry your full weight + sim and the price is not that different when you add in all the extras required for a reliable high powered DC system.
    Big Heave Motion : Found through building many sims that it is near impossible to do this force well via G systems, note though that big heave requires fast/powerful actuators 500mm/sec minimum. Actually fast/powerful actuators are good for any DOF, as if you cannot make the required simulation point in the required time the motion can be clipped as it tries to catch up.
    Roll Motion: Really helps the inner ear for simulation and can reduce motion sickness.
    Pitch Motion: As above.
    Surge: Will be using a harness system and paddles (torso) to give extended forces with just a touch of initial pitch motion (again for the inner ear), for surge impulses and to minimise any unwanted secondary movement.
    Sway: Will be using two independently driven paddles and again a touch of roll. The paddles will also help for surge. Not a fan of using much motion for sway, as unwanted secondary movement can be very noticeable.
    Yaw : Its a compass heading, so no advantage to use it in my sim, with any simulation forces caused by it captured by the DOFs above.
    Other G systems? These can help, but bang for buck the above do a very good job.
    Hope the above helps to explain why I have built what I have.
    • Informative Informative x 3
  8. Eagletrike

    Eagletrike New Member SimAxe Beta Tester Gold Contributor

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    My Motion Simulator:
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    I too was a user of Fusion 360 like many but with that latest changes decided to look for an alternative, not that the introduced restrictions affected me in what I was using it for, just thought the writing was on the wall and moved to FreeCad which I have found is quite useful for my purpose in my opinion.


    Very informative write up, thank you for sharing. My primary focus for my simulator design is aviation, mainly around light aircraft GA and Light Sports Aircraft, usually slow flying, sitting close to the centre of gravity where from my experience the moment of yaw is quite a noticeable motion, as compared to the faster flying F-18's or Airliners etc, where the CofG is fairly well aft of the seating position, Yawing of those types of aircraft would be more like a sway motion. I thought I would just explain my thoughts around my previous question as I would like to incorporate yaw to simulate wind shear usually found on take off landings and in turbulence, which is quick to and fro, performing side slipping and cross wind landings. Performing side slipping and cross wind landings this initially with a yaw input and the rest of the forces applied through pitch, roll and via the G seat for the prolonged forces, then finishing off with yaw to resume previous heading. To implement yaw is going to take a noticeable cost both financially as well as weight wise but like you have said "no advantage to use it in my sim, with any simulation forces caused by it captured by the DOFs above" . So in conclusion is a question for me that only I can answer I guess, will my DOF's be enough to give me my yaw requirements to justify my costs?
    Thank you SeatTime.
  9. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
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    Yes most things can be subjective, although unless your going to implement a 360 degree continuous yaw system, I will still stand by my statement. All the best with your build.
  10. cfischer

    cfischer Active Member Gold Contributor

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    Just to throw another opinion into the mix, I've been experimenting with 360 continuous yaw in my racing sim and it's probably one of the best parts of the whole system. Highly recommended!
  11. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
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    Have never tried it, but would expect you to be correct, just too much of a engineering change/expense for me to ever consider.
  12. cfischer

    cfischer Active Member Gold Contributor

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    It is a total pita for sure
  13. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    AC motor, Arduino, Motion platform, 6DOF
    Well my nice 4K monitor failed :mad: Could be the move, or just the speed of the sim. Decided to therefore revisit VR and found that the latest motion cancellation software for steamVR works brilliantly (OpenVR-MotionCompensation_0_3_5) with everything I can throw at it so far (The Pimax motion cancellation was a bit hit/miss with some titles likely due to lack of filters). Has given a new lease of life for my VR use, although headset is still uncomfortable for long sessions.
    • Like Like x 1
  14. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Out of curiosity have you tried the Vive DAS strap on the Pimax, with a aftermarket face gasket? That made a world of difference in terms of comfort, though the Pimax can still be a bit tight round the nose with smaller IPD.
  15. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    AC motor, Arduino, Motion platform, 6DOF
    For my 8kx, from day one (moved from my 5K) as the original PIMAX one was faulty. Unfortunately I do also have a low IPD.
  16. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    AC motor, Arduino, Motion platform, 6DOF
    FI - My current tacker setup for motion cancellation. Works great with only a minimum amount of filtering (LPF = 0.9 and Dema = 7 )- will likely change the vibration absorbing cushion to something a bit less ghetto in the future :). Its all made with steel with the part that holds the Index controller felt lined and tapered so that it slides and locks-in. The tape is only to stop it shaking out in use.

    IMG_20210713_143607.jpg

    IMG_20210713_161454.jpg
    • Like Like x 2
    • Creative Creative x 1
  17. Zippo246

    Zippo246 Member

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    My Motion Simulator:
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    Hi Seat,
    Do you have 10kHz whine with your servo drivers/motors after the earthing/EMI filtering? Are you in QLD now?
    Looking forward to how you do G systems. Have three actuator system for flight and very space limited.
    Cheers, Zip