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4DOF by gigifux

Discussion in 'DIY Motion Simulator Projects' started by gigi, Feb 7, 2017.

  1. gigi

    gigi Active Member

    Joined:
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    +139 / 1 / -0
    My Motion Simulator:
    2DOF, JRK, 4DOF
    After my first experience of a 2dof simulator, ...... only made possible thanks to the support received from you on this forum I am going now to build a 4 dof, then adding the surge and traction loss. I used to design my favorite tools ... pencil, ruler and also a compass but especially the mind, the incurable desire to build ....; my skills, unfortunately, do not allow me more
    Although fascinated by this solution with suspended engines, I decided to make a traditional 4dof, to separated from each other the surge and tl forces and the latter in turn by the pitch and roll forces. Right away I realize the complexity of this project, at least compared to a 2 dof traditional, but still want to try. In my project, probably nothing new or special but a workaround. I hope that in this case your views and suggestions can help me in this endeavor.
    The shopping list in no particular order:
    - A wife and 2 childs patient, so patient
    - Iron ... So iron ... ..30x30, 40x30, 50x30, 40x40 and 50x40 U open
    - The seat sliding slide for sliding pedals
    - 2-ZYT90-155-12 MCP4 engines 60: 1 65 rpm for pitch / roll / heave
    - 2-ZYT80-120-12 MCP4 engines 50: 1 90 rpm
    - 4 Cards jrk Pololu 12V12
    - 4 Potentiometers with 180 ° hall sensor
    - Linear guide for surge effect
    - Wheels taken from rollerblade shapely
    -Wheels trolley
    -Wheels taken from shower!
    -4 Power supplies 12v 50th
    - many others small things like cables, screws and bolts,
    -simtools and your continued support and encouragement here

    For Tl I wanted to use the curves linear guides, but after discovering their exorbitant cost I decided to look for another solution. Then through a friend I made a 5 mm thick plate. curve above and below which the wheels run. This so because the structure remains more stable when the engine of tl kicks. Above there will rollerblade wheels of which I reduced diameter using a drill press and a file .... unfortunately I do not have a lathe, while below there will be some very small wheels of the type of those used for the sliding doors of the box shower. At the center 2 wheels of the type used for the trolley . In the front two wheels taken from rollerblading. Also a bearing ultra-flat from lazy susan. In order to better adjust the height of the wheels I made of the eccentrics. This way I can adjust the height of each wheel and thus have an optimal contact of the same with the base. As for the surge, well there is not much to say, the solution of the linear guides is in my opinion the best for smoothness and quiet operation, and also the cost gold is acceptable. Initially I had planned and bought 150mm 12mm slides with 8 sliding bearings but I want to try to use only 75mm slides with 4 slide bearings. We'll see.
    The surge will be 30 cm 15 forward and 15 back tl 30 cm 15 right and 15 left.
    The Tl curve radius is 130 cm

    Attached Files:

    • Like Like x 5
  2. gigi

    gigi Active Member

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    My Motion Simulator:
    2DOF, JRK, 4DOF
    photos in which you can see in detail the sliding system of Tl, 3 rollerblade wheel up and 2 box door small wheel under the iron plate, mounted on eccentric pin to be able to adjust

    Attached Files:

    • Like Like x 2
    Last edited: Feb 7, 2017
  3. gigi

    gigi Active Member

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    My Motion Simulator:
    2DOF, JRK, 4DOF
    other photos working in progress

    Attached Files:

    • Like Like x 1
  4. gigi

    gigi Active Member

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    My Motion Simulator:
    2DOF, JRK, 4DOF
    wheel with eccentric pin for Tl in the centre of structure

    Attached Files:

  5. gigi

    gigi Active Member

    Joined:
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    My Motion Simulator:
    2DOF, JRK, 4DOF
    wheel with eccentric pinfor tl in the front of structure

    Attached Files:

    • Agree Agree x 1
  6. Archie

    Archie Eternal tinkerer

    Joined:
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    Wollongong, NSW, AU
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    My Motion Simulator:
    2DOF, DC motor, JRK
    Watched. :popcorn
  7. gigi

    gigi Active Member

    Joined:
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    My Motion Simulator:
    2DOF, JRK, 4DOF
    One question...
    For roll pitch and have I will use 2 motors ZYT90-155-12 MCP4 60:1 65rpm
    For surge and tl I can use or 2 ZYT80-120 -12 MCP4 50:1 95rpm 0r 2 ZYT90-155-12 MCP4 60:1 60 rpm
    The radius of rl lever arm can be max 20cm, the radius of surge lever arm can be max 25cm
    Wich speed in mm/s you suggest for tl and surge?
    Wich motors you suggest between the two model i have available?
  8. gigi

    gigi Active Member

    Joined:
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    My Motion Simulator:
    2DOF, JRK, 4DOF
    Hi guys! .....my work is in progress, here some photos, next week I hope to post more photos and details

    Attached Files:

    • Like Like x 2
    • Agree Agree x 1
  9. SeatTime

    SeatTime Well-Known Member

    Joined:
    Dec 27, 2013
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    Retired
    Location:
    Brisbane Australia
    Balance:
    28,370Coins
    Ratings:
    +2,844 / 38 / -0
    My Motion Simulator:
    AC motor, Motion platform
    Edit: Posted in error - I think you have built a balance rig and not what you have shown in your first post :p. Looks good :thumbs. Hope it all works well.
    Last edited: Mar 23, 2017
  10. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    AC motor, Motion platform
    Also good luck in ever finding the first item in your shopping list :).
    • Agree Agree x 1
  11. gigi

    gigi Active Member

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    My Motion Simulator:
    2DOF, JRK, 4DOF
    One question .....
    I read that optimal linear velocity is 700 mm/s. This also for surge and traction loss?
    My tl will have 15 cm left and 15 cm right, surge 15 cm backward and 15 cm forward. For this my arms are long aprox 18 cm. With my motors that have 65rpm this mean approx 1200 mm/s . This velocity is too much fast?. Which is the best way to reduce velocity if I cant reduce the lenght of arm?
  12. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    The range for good motion is generally regarded as 150-700mm/s.

    Do your motors have the torque with 18cm levers to drive the anticipated load?

    Reducing the lever CTC distance lowers the linear speed but increases the torque, gearing is another option.
  13. gigi

    gigi Active Member

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    My Motion Simulator:
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    I can't reduce the lever if i want 30cm of surgelati And tl range
  14. gigi

    gigi Active Member

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    My Motion Simulator:
    2DOF, JRK, 4DOF
    Sorry t9...I can't reduce the lever if I want 30cm range for tl and surge.
  15. bodgy

    bodgy Member

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    My Motion Simulator:
    2DOF, DC motor, JRK, Motion platform
    I have the first item in your shopping list, trust me they make it very hard to build and use a simulator.

    I will sell mine used if we can organise shipping for them cheap enough to your country.
    • Funny Funny x 2
  16. speedy

    speedy Well-Known Member

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    My Motion Simulator:
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    @gigi ... just don't worry about the extra speed you have ... what you should worry about is if the motor can handle the load for long time or not ? ...

    other than that faster motor is always good and it's not going to overshoot the motion as long as the PID parameters are well tuned .

    Edit : you can reduce the speed and the overall response of a motor by tuning the PID not to be so precisely aggressive following the motion so fast .
  17. gigi

    gigi Active Member

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    My Motion Simulator:
    2DOF, JRK, 4DOF
    Y
    yes.....my problem is that I would like to control my motors 12V 180W 23A nominal current and 40A peak current with Jrk 12V12 that support only 30A peak current.....sigh sigh. mission impossible I think
    • Agree Agree x 1
  18. RacingMat

    RacingMat Well-Known Member Gold Contributor

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    Maybe you can double the boards like Pit did with motomonster ?
    Try asking Pololu :)
  19. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    My Motion Simulator:
    DC motor, Arduino, 6DOF
    The jrk 12v12 is driver and motor controller in one. You can't double two jrks to one single driver, though it uses the VNH2SP30 as we know from the Motomonster. I successfully tested the VNH5019 as a dual combo, but it is way more expensive than the MotoMonster from Chinese sellers. Since you don't get really more in a comparison with a SaberTooth I would buy the SaberTooths as the first choice.
    • Informative Informative x 1
  20. gigi

    gigi Active Member

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    My Motion Simulator:
    2DOF, JRK, 4DOF
    Hi thanks for your reply. Pololu answered me that jrk 12v12 can't control a motor with 23A continuous and 40A peak
    What does mean "double the boars"? with pololu one jrk 12v12 for one motor