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Lauching finally a 3DOF (seat mover) instead 6DOF low cost dynamic simulator

Discussion in 'DIY Motion Simulator Projects' started by Oms, Feb 4, 2018.

  1. Oms

    Oms known as "Doc6dof"

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    Hi guys,

    sorry I will finally simplify my project (6dof) to a simple seat mover (3dof), because the room where I can place the simulator is finally much smaller than the room I had initially reserved for that...

    So do not consider all the following discussion...:)

    I will finish this seat mover (I think I am very closed to), but I have a dream: build
    a compact 6dof (stewart platform) + partial home made G-Seat + VR and with degrees of freedom around +/-30° for pitch/roll/yaw and around +/-20cm for surge/sway/heave... I do not know if it is realistic:grin
    _____________________________________

    Initial project (6dof):

    ...
    after several months of reflection, having changed several times the concept, I launch now my project...
    As a good video is better than a long discourse, I let you see my short movie and I look forward to have your opinions, questions, advises. Thank you in advance



    simu dyn.jpg
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    Last edited: Aug 15, 2018
  2. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator SimTools 2.0 Beta Tester

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    Thanks for sharing your project and intended approach.

    A couple of comments to consider.

    You won't need 6 Arduinos to drive your rig, as an Arduino can control more than one motor, see here for code choices: https://www.xsimulator.net/community/faq/arduino-code-for-use-with-various-hardware-and-simtools.31/

    It looks to have up to around 40 degrees roll and pitch, that may look impressive but likely may have speed and power issues for anything other than gentle flight simming, there is also a lot of mass to control.
    • Agree Agree x 2
  3. Fluke

    Fluke Member

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    Very unusual build, I cant wait to see it progress.:popcorn:thumbs
  4. Oms

    Oms known as "Doc6dof"

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    Hello noorbeast,

    thank you for you relevant comments. I tried effectively to reduce the number of arduino, but unfortunately, with the architecture I would like to implement, too much pins are needed (for example juste for analog input: feedback, current, tachymeter, an 3 adjustable resistor to read for Proportional, Integrale, Derivative value, that will not be adjusted by soft). I am currently writing the header of the software, where you will find much more detailled explanations. In anycase arduino boards are not very expensive so I do not try to optimize the number of boards.

    Concerning the required power for the rig movement, I am not sure effectively I will have enough power with enough fast movements. I hope thatwill enough enough for flight simulation, and I will use in this case only the seat moving for car races... In fact I do not know what will be the performance, taking into account that:
    The rig weight will be around 150kg (including the pilote), and it will be almost balanced (using the center of gravity + a garage door spring) but not totally (because cable drive can work only in one direction…), with the aim of reducing the required power. It is easy to find used washing-machine universal motors for about some hundreds Watts to 1 kiloWatts. With this kind of motor, and without limitation, the spin speed increases very rapidly to 10 000 and more rpm (it is the reason I have to measure the current and thespin speed thanks to the tachymeter present in these motors). The gear ratio in insure by classical steel endless screw + barrel nut (diam 10 or 12 mm ?), surrounded by a PVC conduit (to prevent grease projection) with a slot all along for the mechanical crank link (ball bearing slide). Sure I will have a lot of adjustement and clarification to make when I begin to test my simulator...
  5. Oms

    Oms known as "Doc6dof"

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    Me too Fluke I would like to finish rapidely. I think severals months will be required. I have begin to weld the cockpit, I will send photos in a future post.
  6. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator SimTools 2.0 Beta Tester

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    My Motion Simulator:
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    The link I provided has different Arduino code you could use, have a look at the SMC3 code, as it also has a handy graphical program for managing settings.
  7. Oms

    Oms known as "Doc6dof"

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    Hi, I had a look on SMC3 arduino code, that seems interrested. PerhapsI can divide by 2 the number of arduinos.
  8. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator SimTools 2.0 Beta Tester

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    My Motion Simulator:
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    Sure can :thumbs
    • Agree Agree x 1
  9. Gadget999

    Gadget999 Active Member

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    are you running the motors AC ? how do you swap direction

    i suggest you get an arduino and program it and get a motor running to get familiar with the smc program

    have you decided on the ballscrew and threads ?
  10. Oms

    Oms known as "Doc6dof"

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    I will use washing-machine universal motor, so in 220v ac, but normaly this kind of motor accepts also dc. To swap the direction, you have to swap the 2 terminal connections of the stator, or the 2 terminal connectors of the rotor (the rotor and the stator are connected in serie).
    I have also began to write the arduino code, but from scratch
  11. Gadget999

    Gadget999 Active Member

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    interesting the motor will accept DC - does it use brushes ?
    how many volts DC will the motor need ?
  12. OZHEAT

    OZHEAT Member

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    @Gadget999
    By separately powering the stator and armature windings he is turning an AC universal motor in to a DC sepex motor.
    A sepex motor is basically a DC brushed motor but uses a coils (electromagnet) instead of permanent magnets on it's stator.
    Yes, an universal motor has brushes and commutator on it's rotor.
  13. Oms

    Oms known as "Doc6dof"

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    I think you have answered to you own questions...,
    concerning the voltage in dc, I suppose it is the same than in ac (so 220v in my case). I will use a diode bridge to transform 220ac in 220dc, and not added high capacitor because that would increase this voltage about to 320v with risk of damage (motor overvoltage). Then I will use a full bridge (mos or igbt) for a PWM power control
  14. Oms

    Oms known as "Doc6dof"

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    For your information I have created a specific post in the good place (actuators and drivers) so I will not continue to describe this part of my project in this current post, but in the new one:
    https://www.xsimulator.net/community/threads/powerful-and-low-cost-220v-motor-driver.11627/
  15. Oms

    Oms known as "Doc6dof"

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    From drawing to reality: I had some availability this week-end, so here after a first component (base of the cockpit)...


    support cockpit drawing.jpg support cockpit photo1.jpg

    support cockpit photo2.jpg
  16. Oms

    Oms known as "Doc6dof"

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    Hello all,
    I am available this afternoon, so I will make the seat pivot, which is a part of the seat mechanism, then I will send you photos by this evening...


    2018_02_25 seat mechanism.jpg

    2018_02_25 seat pivot.pg.jpg
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  17. Oms

    Oms known as "Doc6dof"

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    Hi, I have well progressed on the seat pivot, but no finished...

    IMG_20180224_172735893.jpg

    IMG_20180225_190108557.jpg
  18. Oms

    Oms known as "Doc6dof"

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    Hello all,
    some news, the design is changing (version 2 ). Mainly the base (to provide large movements pitch, roll, yaw-traction loss) is rethinking : use of 220v monophasis hoist (my concern is how to control the speed of asynchronus motors). I have also decided to implement a triple head. The first test with a gt1060 6g overclocked and rfactor are very good (I paid the 2 19'' 4/3 screens 25 euros each one...),
    see you...
  19. Oms

    Oms known as "Doc6dof"

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  20. Oms

    Oms known as "Doc6dof"

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    Hello DYI men/women,

    little by little my Xdof dynamic simulator takes shape, here after the last photos ...

    see you


    IMG_20180317_151453033.jpg
    IMG_20180318_144658815.jpg
    IMG_20180318_150708903.jpg
    IMG_20180325_144422563.jpg
    IMG_20180325_144721483.jpg
    IMG_20180331_115551306.jpg
    IMG_20180331_115611249.jpg

    Attached Files:

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