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Cyril's 2dof motion w/ linear actuator

Discussion in 'DIY Motion Simulator Projects' started by cyril69850, Nov 11, 2016.

  1. cyril69850

    cyril69850 New Member

    Joined:
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    Location:
    France
    Balance:
    293Coins
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    My Motion Simulator:
    6DOF
    Hello everyone,
    After asking some here and there it's time for me to open a real topic for my project.
    For now I'm just full of ideas and dream, and my pc stuffed with info from everywhere about motion sim.

    The project:

    Making a 2dof motion simulator for space sim, racing sim, and flight sim.
    I don't plan to innovate and base my work on platform like @konterror
    I'd like to make one with linear actuator around 600mm travel distance based on @SeatTime to add more angle and real movement. (not just kind of shaking)
    The best solution I've found for the structure is aluminium modular system.
    Everything powered by 24v ≈ 300w electric scooter motor (still do decide, may need advice on this)
    Drive by arduino of course and IBT-2 H-Bridge.
    Trying to keep the total budget under 1000€

    My goals

    Build something fonctionnal and fun.
    Learn the basics of electronic, arduino, maybe welding.
    Don't blow up my house.

    Questions still waiting for an answer
    What motor to use to have an immersive enough speed
    What controller is best for my budget
    Some design parts of the actuator (pot place, limit switch for example)
    Exact size of the rig

    The parts
    -Motor 280w 24v
    -Ballscrew 750mm
    -Potentiometer 10turn (11€ x2) ->OK
    -Limit switch (1.75€ x4) ->OK
    -Aluminium structure from German workshop
    -Server PSU AA23260 625W (28.5€) -> OK
    -Arduino (19.5€) ->OK
    -IBT-2 H-Bridge not suitable
    -Sabertooth (120.90€) ->OK
    -Kangaroo (23.8€) ->OK

    I will start to gather all the part and keep you update as frequently as possible.
    If I may ask to the most advanced builders (I'm looking at you @wannabeaflyer @wannabeaflyer2 @SilentChill @SeatTime @Grigory ;)) to take a look at the project and tell me if it seem a possible build and if you see any problems i may have not seen. Thanks by advance guys.

    Best wish
    Cyril
    Last edited: Dec 7, 2016
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
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    Occupation:
    Innovative tech specialist for NGOs
    Location:
    St Helens, Tasmania, Australia
    Balance:
    144,596Coins
    Ratings:
    +10,741 / 52 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
  3. cyril69850

    cyril69850 New Member

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    My Motion Simulator:
    6DOF
    Thank you for your answer @noorbeast I've already read the articles about the linear actuator.
    To know the speed I need to find the distance per rotation of the SFU1605. I've read somewhere 20mm per rotation but not sure about it. If this is true it mean that the theorical speed with my1018 motor would be 900mm/s which is huge! I must be wrong.
    <edit> Just read 5mm on a alixpress description. So it's probably between 5 and 20mm :D
    Last edited: Nov 11, 2016
  4. SilentChill

    SilentChill Problem Maker

    Joined:
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    Occupation:
    Railway Maintenance
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    Morecambe, Lancashire, England
    Balance:
    20,395Coins
    Ratings:
    +3,480 / 34 / -0
    My Motion Simulator:
    DC motor, Arduino, Motion platform, 6DOF
    A 2dof with around 600mm of range !! :eek: are you crazy lol You best get a seat belt on that list too :D
  5. SilentChill

    SilentChill Problem Maker

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    Occupation:
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    My Motion Simulator:
    DC motor, Arduino, Motion platform, 6DOF
    I would use something else other than the IBT-2 they were less than useless for me on my 2/3DOF . I would say MM's if you can get a good supplier but I have had no luck.
  6. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    I think it is more like 5mm each rotation of ballscrew, but I could be wrong.
    • Agree Agree x 2
  7. cyril69850

    cyril69850 New Member

    Joined:
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    My Motion Simulator:
    6DOF
    The seat belt is probably a good idea. But the platform will not move 600mm. Horizontal position of the platform will be half of the actuator range and then - 300mm for acceleration and +300mm for brake.
    I was almost sure about the IBT-2 because nobody use it so it have to be a bad idea. I've seen all the struggles you and other had with MM. In the same price range of good MM (50€ each) I'd better go for a sabertooth.
  8. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    Ratings:
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    My Motion Simulator:
    3DOF, DC motor, JRK
  9. cyril69850

    cyril69850 New Member

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    My Motion Simulator:
    6DOF
    You are right It's 5mm per rotation. If I do the math it's 229mm/s. Since the travel distance from horizontal to bottom (or top) is 300mm I'm gonna have around 1.5second which sound good.
    I'm not quite sure about the 600m ballscrew, a 750mm is almost the same price so why not going for the biggest I can?
  10. wannabeaflyer2

    wannabeaflyer2 Well-Known Member

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    My Motion Simulator:
    2DOF, Arduino, Motion platform, 6DOF
    Just my 2 Cents but beware The length of ballscrew . From my DIY Cnc machine I found the longer the unsupported screw the more whip you get and for our simple actuator design you need to optimise travel distance against the fact its loaded and unsupported if that makes sense , remember unlike CNC where the ballscrew is supported both ends for our use one end will rattle around in the actuator rod .. the 600mm is a nice Comprimise ( crap spelling but you get the gist :) ) ,,..... Don't hold me to that little tit bit of self acquired knowledge though , better guys out there can qualify this
    • Informative Informative x 1
  11. cyril69850

    cyril69850 New Member

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    My Motion Simulator:
    6DOF
    I've found these on sale

    1 : Model DPS-250LB C Rev 00 - 250W - (x1) : 5€
    2 : Model AA23300 - 550W - (x2) : 10€
    3 : Model DPS-500CB A Rev 05 - 502W (x2): 10€
    4 : Model HP-U280EF3 Rev A00 - 280W - (x1) : 5€
    5 : Model API3FS25 - 585W - (x2) : 10€
    6 : Model AA23260 - 625 W - (x8) : 10€

    More power is better?
    Or which one is the simplest to mod?
  12. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    +10,741 / 52 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
  13. mariano68

    mariano68 Active Member

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    My Motion Simulator:
    2DOF, Arduino, 4DOF
    Yes and no...
    First, put each one of that psus on google and check if they are already researched in the RC forum (these are the guys that research how to get them working, regulate fan speed, change fan, get more power out of them, etc).
    Second, check noise level, there are some extreme psus with huge power... huge noise! There are also some super powerful ones that comes fanless or you can swap fans with no problems.
  14. cyril69850

    cyril69850 New Member

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    My Motion Simulator:
    6DOF
    Thank you for your advices guys!
    I'm studying the psu stuff to choose wisely.
    I've found ballscrew with 10mm pitch so double the speed, but the drawback would be more stress on the motor I guess.
  15. mariano68

    mariano68 Active Member

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    My Motion Simulator:
    2DOF, Arduino, 4DOF
    Check this to analyze different motor/screw combos

    Attached Files:

  16. cyril69850

    cyril69850 New Member

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    My Motion Simulator:
    6DOF
    Hello guys,
    Quick update about the project:
    I have reduced the options for the motor to only two choices N°1 and N°2. One is more powerfull but slower RPM the other have higher RPM but less powerfull.
    I bought to a friend an old seat for only 20€ that I will restore completely (see pictures attached)
    I received the power supplies. I went with two AA23260 625W since it's the most used in RC. It was 28.5 for both.
    Some electronics parts are on the way, Sabertooth 2x32 (the best choice I guess) Arduino Uno, Kangaroo, 10turn pots, switch limiter. all that for around 200€
    Got a brand new Logitech G29 with shifter for 230€ (thank you amazon black friday)

    I will try to keep track of all the expenses along the build.

    Now I need to make a firm decision about the motors!

    I've tried to use your calculator @mariano68 but I must have f&@%ed up somewhere because the result is that I will get 550 newton, which is ludicrouso_O

    Will be back as soon as I have something to show.

    afuD4Tq.jpg ckaEdWP.jpg gD63Jzm.jpg KaXhG45.jpg
    • Like Like x 1
  17. Tim McGuire

    Tim McGuire "Forever a work in progress"

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    Occupation:
    Electrical/Electronics Engineer
    Location:
    Canada
    Balance:
    2,158Coins
    Ratings:
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    My Motion Simulator:
    3DOF, DC motor
    Is a 1605 ball screw going to be rigid enough for this application? (honest question, I know nothing about these things). Platform sims almost always carry more momentum with their movement than seat mover sims, and the screw portion is only going to be about 0.65in in diameter.
  18. wannabeaflyer2

    wannabeaflyer2 Well-Known Member

    Joined:
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    london uk
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    My Motion Simulator:
    2DOF, Arduino, Motion platform, 6DOF
    The ballscrews will be fine checkout @SeatTime and @SilentChill projects and mine as well to see them performing
  19. cyril69850

    cyril69850 New Member

    Joined:
    Nov 4, 2016
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    21
    Location:
    France
    Balance:
    293Coins
    Ratings:
    +2 / 0 / -0
    My Motion Simulator:
    6DOF
    Really small news: Just received the electronics parts!
    And my god it looks complicated to me:( But I'll figure it out at some point in the future:thumbs

    Now I'll try to order ballscrew and motor before the end of the month.

    I've found somebody to do the seat for me so really happy for that!

    That's it for today, see you.

    1 - OJXKS8e.jpg 2 - N1hVxrY.jpg 3 - NsdPZpl.jpg 4 - S5X0lAt.jpg 15515889_1338937959470907_1999064347_o.jpg
    Bonus is my actual "ghetto style" setup
  20. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
    Jul 13, 2014
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    Occupation:
    Innovative tech specialist for NGOs
    Location:
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    Balance:
    144,596Coins
    Ratings:
    +10,741 / 52 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    One step at a time and check with community members, you will get there!
    • Agree Agree x 1