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SeatTime's DC motor Sim

Discussion in 'DIY Motion Simulator Projects' started by SeatTime, Dec 28, 2013.

  1. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    My Motion Simulator:
    3DOF, DC motor, JRK
    The bucket of bricks looked liked they were standing by ready to jump on board for the load test :grin
  2. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    DC motor, Motion platform, 6DOF
    Actuator load test via utility. 24Kg dead lift.


    Actuator load test in-game 24kg dead lift. This is about twice what I could reliably get out of the 60:1 gear boxes with a 65 cm arm.
    • Informative Informative x 1
  3. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Great job @SeatTime...you have to be really happy with that.

    I knew those bricks were anxious for a test ride ;)
  4. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    DC motor, Motion platform, 6DOF
    I'm quietly happy, and these would be excellent for most sim builds, but when I loaded it up more, it could lift it OK but when it quickly dropped in-game the inertia caused the motor to overload/slip and it dropped further and enabled the failsafe. Would like some headroom before I invest allot of time/effort in building six of these (unlike Australian Politicians when they build Submarines:rolleyes:). As I don't want to go any slower, I am going to test some bungee cords inside the actuator frame (I have the room) to balance the expected load as per another actuator design.
    • Informative Informative x 2
  5. bsft

    bsft

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    Well done, nice and fast as well. Very impressive.
  6. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    DC motor, Motion platform, 6DOF
    Fitted one bungee on the actuator, works really well and has improved the tracking and removed the inertia issues at wanted load. It seems like the way to go. It may not look like it, but I have room for four. I'm amazed at the speed and weight this actuator can move with a little 200 Watt motor.
    Actuator Bungee mod.jpg
    • Informative Informative x 2
    Last edited: Dec 16, 2014
  7. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    My Motion Simulator:
    3DOF, DC motor, JRK
    I am impressed with your experimentation, initiative and work @SeatTime, it really opens up a new dimension for anybody considering making actuators as part of their future build.
  8. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    DC motor, Motion platform, 6DOF
    Linear Actuators certainly have some positives apart from complexity and cost. For interest I looked up information for the SCN-6 (approx $1000 + postage), as I thought it would have similar specs to mine (although mine has a 380mm stroke and I have tested it moving at approx 200mm sec at required load (24kg). Data for the SCN-6 is below, take note of how the max load must drop as the speed increases (max 5kg at 200mm sec). At a similar load to mine their best model can only run at 50mm sec:(. I know you can get actuators with better performance, but the price becomes astronomical ($3000 +), so in that sense the SCN-6 is reasonable pricedo_O. No wonder I'm building my own. Also just read that 'maximum vertical load' is actually 'Maximum Push Mode' so you can take 5 to 20 kg off all the graph data.

    SCN6 SPECS.jpg
    • Informative Informative x 2
    Last edited: Dec 16, 2014
  9. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    DC motor, Motion platform, 6DOF
    Also as a comparison here is the data for a SCN5 - No wonder you have to be so careful with them. Good luck ever seeing 400mm Sec:rolleyes:. Maximum vertical load 'Push force Mode' is also less than shown in the graph as per the SCN6.
    scn5 specs.jpg
    • Informative Informative x 1
  10. adgun

    adgun Active Member

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    Hi
    Can you give me the pitch from youre ballscrew
    Regards Ad
  11. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    DC motor, Motion platform, 6DOF
    Common - 5mm
    • Like Like x 1
  12. bsft

    bsft

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    @SeatTime , my brikie actuators have some speed and kick to them, but yes, they are hideously expensive to buy new, like $2500 each from supplier or $800 each chinese copy, less motors of course and other bits.
  13. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    DC motor, Motion platform, 6DOF
    While I'm building my 6dof, my current sim still gets a workout. Don't think I have ever shown the heave module in real action before, so here it is below. Although it does not look like it is shaking the seat like a 2/3Dof will for heave, it is still is giving me a good 'bouncing' over the bumps via the seat module which can sometimes be seen in the video. All food for thought for anyone building a sim. FI I'm on Assetto Corsa with a formula car - Still using the DK2 Oculus, as a normal screen just does not cut it for me now.

    • Like Like x 4
    • Winner Winner x 2
  14. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Your heave plate idea is so much better for the Rift.
  15. Nick Moxley

    Nick Moxley Well-Known Member

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    My Motion Simulator:
    2DOF, 3DOF, DC motor, JRK
    Who wears short Shorts.......Apparently seatTime does. :grin:grin
    • Funny Funny x 1
    • Optimistic Optimistic x 1
  16. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    DC motor, Motion platform, 6DOF
    It is summer here with my sim room in a roof extension to my house so it can get pretty warm (well that is my excuse :)) and the wearing of sport shorts is pretty common in OZ.
  17. shannonb1

    shannonb1 Well-Known Member

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    My Motion Simulator:
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    My team name is "No Pants Racing"....I'll leave that to the immagination...

    Isnt your motion forward and back surge instead of heave?
    • Funny Funny x 1
  18. bsft

    bsft

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    Australia gets pretty damn warm in Summer , so shorts are needed for summer racing.
    @eaorobbie can confirm thsi
    • Agree Agree x 1
  19. AceOfSpies

    AceOfSpies Living the Dream!

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    My Motion Simulator:
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    Hi @SeatTime, a really good illustration of how you turn your head and look into the corners when you approach them.
    This is perhaps for me the best advantage of driving with the Rift.

    Mike:thumbs
    • Agree Agree x 1
  20. WowaDriver

    WowaDriver Waldemar Jost

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    Hi @SeatTime,

    Really happy to find your buildlog an especially your heave module...

    Is it possible to get an video of the seat inside without the red upholstery to see the nacked movement of the steal plate?

    How does it feel? I'm thinking about a realistic feeling for heave will only give you the experience if you goes up with the seat together and not only your body without the seat, so what I mean is how it feels when the steal plate is pushing your body out of the seat?

    How long are the levers?

    I think a movement area of 20-30mm is more than enough or?

    Is it only possible to get a movement upside or also possible to get downside?

    Best regards

    Waldemar