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Showroom ODrive Turnigy 190kv BLDC 6DOF - Here we go again

Discussion in 'DIY Motion Simulator Projects' started by SilentChill, Oct 12, 2019.

  1. BiT0

    BiT0 Member

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    Really impressive @SilentChill !
    I am very interested in the ODrive and in general into BLDCs.
    Do you think your actutator design would fit a 4 actuator rig SFX style?
  2. lromaniuk

    lromaniuk bny

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    Wow - that was fast. Congrats on such a rapid build. Your printed parts are stunning, though I have some concerns about actuator assembly precision. You see I'm working (pretty slowly) on my take on 6dof and during my resarch and some help from my friend who is a constructor of several different industirial machinery I'm convinced that precision is a key to propper operation of mechanical parts and assemblies. On your actuator assembly video you didnt check screw concentricity with dial indicator, your shaft looks like a regular alluminum tube that doesn't hold specific diameter tolerances and ruffness required for slide bushings. The same goes to your guide shafts (at least that how it looks). The screw and nut are exposed to high stress during violent moves (obviously you know that :) ) and I belive that thier position relative to eachother and rest of the assebly is crutial if you want semi silent operation and longer life of components - safty is also a concern since parts that are not properly aligned can break in most unexpected moment. Don't get me wrong I'm not trying to diss your fantastic job just wondering what compromises can and can not be made. What do you think?
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  3. SilentChill

    SilentChill Problem Maker

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    My Motion Simulator:
    DC motor, Arduino, Motion platform, 6DOF
    Gonna be a while until I get the frame built :(
    I know your concerns but my last rig which lasted 3 years with minimal breakdowns and no major failure of any major component even though that was hand drilled and marked by me. It was really bad aligned made out of a mismatch of wood, plastic and a lot of screws. It was still going strong for long long sessions before I dismantled it.

    These are 3D printed so once all tightened up and held together the tolerance of things being aligned will be within 1mm which is probably 10x more precise than my last build. I think some adjustments will be made but I know where the stress is and what will take the most battering.

    From what I have experienced since I started down this road is ............... don't always listen to the experts.

    As you know I make it and see what happens what's the worse that can happen apart from some broken plastic or a bent ball screw , I won't die and I'll have fun doing it :) and if I pull it off it's a benefit for everyone :D
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  4. Thanos

    Thanos Building the Future one AC Servo at a time... or 6

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    My Motion Simulator:
    AC motor, Motion platform, 4DOF, 6DOF
    Make sure to keep rolling video during use, who knows you may capture any catastrophic failure of the 3D printed parts and the clip might go viral... ;)
  5. SilentChill

    SilentChill Problem Maker

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    My Motion Simulator:
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    Wondered when you would pop up @Thanos , you've been wrong with everything I've done so far so hopefully the trend will continue...;)
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  6. Philip K

    Philip K New Member

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    Hi,

    Just wondering what sort of speed you are aiming for and the stroke of your actuators? It seems very interesting as like others I’m wary of the sfx setup and the issues with the whine and emi.

    Great work, will be following with interest!
    • Like Like x 1
  7. SilentChill

    SilentChill Problem Maker

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    My Motion Simulator:
    DC motor, Arduino, Motion platform, 6DOF
    450mm stroke and the speed is up to 500 mm/s ?? I think ?? I have no idea to be honest lol :D
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  8. SilentChill

    SilentChill Problem Maker

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    My Motion Simulator:
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    Hmmm dunno if this will be too low but I have no head room and would like to be able to get in and out of it easily.

    The frame is flexi as hell with it being wood.

    Angles on the actuators maybe to low but I will have to try and see what happens

    Need to get the frame made ASAP
    20191211_210912.jpg 20191211_210854.jpg 20191211_210904.jpg
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  9. hannibal

    hannibal Active Member

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    My Motion Simulator:
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  10. hannibal

    hannibal Active Member

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    My Motion Simulator:
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    this photo was 3 weeks ago
    tmrw, my coworker will help me finish off the welds.
    im trying to say the same like you @SilentChill ... 20191122_150558.jpg

    I need to get the frame made ASAP!
    • Like Like x 3
  11. Thanos

    Thanos Building the Future one AC Servo at a time... or 6

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    My Motion Simulator:
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    I hope I'm wrong about how strong the 3D printed parts are... wasn't trying to demean your creations!
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  12. wannabeaflyer2

    wannabeaflyer2 Well-Known Member

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    My Motion Simulator:
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    Hi @hannibal Credit where its due :) i got started in this game through @SilentChill and @SeatTime . so standing on giant shoulders as it were , but great to see next gen stuff here always , My Project working pace is soooooo Slow but getting there , loving and looking at the great progress being made here By @SilentChill .. fan club now has another member :)
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  13. JAD

    JAD Active Member

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    Just throwing in some comments you probably already thought off.

    It does look a bit low. You could only be sure if you mock up the front pedal area to be sure it works.
    I found in my setup I needed to bring the seat far forward not only for a better centre of gravity location but it also got the wide pedal set forward and out clear of the front pair of actuators.
    Or you could go F1 style and set the pedals up nice and high.
  14. SilentChill

    SilentChill Problem Maker

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    Yeah cheers dude, it's just for ease of getting in and out also all the weight of the pedals and OSW ends up at the front so if j can be further back and bring the OSW back a bit and possibly monitors it will help with the loadnkn the motors. CoG can be sorted with software now so it shouldn't be too much of a problem

    I'm hoping it will fit inside the actuator circle. I may have the seat higher with the pedals lower like a proper car or a plane .
  15. gigi

    gigi Active Member

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    Hi silentchill, sorry if stupid question but...the power supply have a switch to select 42V voltage output and a trim to turn down to 37V? And....will you use a resistor to dissipate the regenerative current and avoid that the psu going in protection mode?
  16. SilentChill

    SilentChill Problem Maker

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    My Motion Simulator:
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    No need for anything the oDrive limits what power the motors get
  17. Pierre Lalancette

    Pierre Lalancette Sir Lalancelot Gold Contributor

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    Hi SilentChill, just looked at your build video in spot check and heard you say about having no care about the weight of the base, because all the equipment will hold it on the ground. I hope that heavy equipment is on the base and not the platform because inertia will throw you around.

    I wish I could be careless like you about full precision and measures (but I am learning!). Cause, like you said, if it does not endangered your life, or any other permanent injuries, full precision is such a BIG waste of time. Simulators are fluid things. They are not build to last. They are build to be break, modify, improved, dismantled, build again...
  18. SilentChill

    SilentChill Problem Maker

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    My Motion Simulator:
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    It's all from experience.

    At the moment it's a frikking nightmare the oDrive is not exactly user friendly to say the least.
  19. Pierre Lalancette

    Pierre Lalancette Sir Lalancelot Gold Contributor

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    Reminds me when I started to design for 3D Printing. I know 3D, it's gonna be easy. Boy, was I wrong. It was a nightmare too. Hang on there, soon, it will be a fading bad dream, like MM's.
  20. JAD

    JAD Active Member

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    Hey Silentchill,
    based on your suggestion on the CISCO power supply, I was able to pick up the same unit on my local ebay for AUD$68 delivered.
    Thanks for the tip off.
    Not sure what Im going to do with it yet. I wasnt planning to begin a do over with BLDC yet, but I couldnt help myself to grab one.
    • Like Like x 1