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6 dof rotary motion platform.....1st try

Discussion in 'DIY Motion Simulator Projects' started by Nicolas Bolduc, Aug 17, 2020.

  1. Nicolas Bolduc

    Nicolas Bolduc New Member

    Joined:
    Aug 3, 2020
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    6
    Balance:
    49Coins
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    +3 / 0 / -0
    My Motion Simulator:
    6DOF
    Hi
    Here I will show my progress for a 6 DOF motion platform i'm trying to build......or actually improve. I bought it from another member after he was having problem converting it to sabertooth driver.

    Right now I' ve redone some part of the wiring as it had overheated, and tidy it up a bit. I've added resistor to dispel the load when motor is acting as a generator and tested almost every composant.

    Now I'm ready to hook it up and fire it and see if I can do something with this. I'm guessing that I will have to change the motor and probably the power supply as they seem too weak for the intended purpose, but I'll try them first and see what can be achieved with those.

    I'll probably have a few questions along the way and if some of you guys can help me along the road I'll be thankful to you to share your experience.

    I have much experience working with electric motor, drivers and all, and a few years experience as a mecanician so I'm pretty much covered for the working part, but I'm still not sure about motor placement...eg what is the best angle for those motor. So let's begin this adventure :)

    I don't know how often i'm going to be active on this forum as i don't have much spare time having young kids always disturbing me, but if all goes well i'm guessing 6 month time it's gonna be working if I don't go short on cash before :p. I' ve budgeted about 1000$ CAD for new motor and power supply so we'll see if I can make it happen.

    Photos will come soon of where I'm at now

    See you soon

    Nicolas
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  2. Ads Master

    Ads Master

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  3. 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:
    St Helens, Tasmania, Australia
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    Ratings:
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    My Motion Simulator:
    3DOF, DC motor, JRK
  4. Nicolas Bolduc

    Nicolas Bolduc New Member

    Joined:
    Aug 3, 2020
    Messages:
    6
    Balance:
    49Coins
    Ratings:
    +3 / 0 / -0
    My Motion Simulator:
    6DOF
    Hi guys,
    I've now redone part of the wiring, installed the brake resistor, did a first test with the smc3 util, and then configured simtools.
    I'm now building my platform to put atop the base metal frame, and after that I will start messing with the PID tuning. Don't have a cable for my phone near me, but I'll post a short video soon.

    Think(and hope) it's going to be faster than expected. Pray witth me that I'll be able to resolve POMAN platform oscillation problem.

    Without any load I was able to have all 6 motor responding fine to a motion/sine wave/triangle wave command
    in smc3 so my hopes are high.

    Still think that those motors are underpowered tough :p

    If all goes well I will try to fit all electronic in a ventilated computer case. Hopefully those freaking loud fan from the PSU will be damped. And after that pretty much all wiring is going to be redone to be as neat as possible. Think I will try to fit the case under the platform but sill not sure if it's a good idea. I'm guessing that once everything is setup, I won't have to touch that part much.

    A question for you guys. I'm thinking of putting 1 circuit breaker for the 120V circuit of the PSU. 1 per 12V line of the PSU(so 3 more) to protect the sabertooth if power supply goes boom. And 6 for the motor to protect the sabertooth if motor goes boom. So a total of 10 breaker. Am I overkill here?

    Thanks for reading
    Nicolas
    • Like Like x 1
  5. Nicolas Bolduc

    Nicolas Bolduc New Member

    Joined:
    Aug 3, 2020
    Messages:
    6
    Balance:
    49Coins
    Ratings:
    +3 / 0 / -0
    My Motion Simulator:
    6DOF
    So......wooden platform is almost done.....need to drill hole for my shifter and handbrake.
    oscillation problem is a thing of the past. there were a few setting to change in describe software.
    but now i think 5 of my gearbox are 25:1 and 1 is 50:1......the 50:1 can do anything it want, with or without me on the platform(i have 40kg strut under each mounting post) and the 25:1 can't bring down the platform if it has no load on it and in certain circumstances can't lift me up(when the angle of the platform are really extreme with this motor alone in smc3). so i've ordered a few more 50:1 motor and i think i'll be fine with those. maybe should have counted the rotation before i order but seeing how it reacted my guess is preetty good me think.

    current draw on the motor is fine.....around 6 amp under normal circumstances.....can go to 9 or 10 with a heavy angle on the 50:1 ......on the 25:1 tough, it caps my power supply at 14 amp pretty regularly.

    the thing is way more powerful than i expected. I'll see if i can live with the 25:1 under the 2 post where my feet are, and just changed the 4 other.....if not i'll change them all.

    I'll have to find which motor goes where in simtool, and while waiting for my motor I'll redo the wiring to the motor, and if i have the time, put the controller in a computer case.

    Lets get back to work :)
  6. Nicolas Bolduc

    Nicolas Bolduc New Member

    Joined:
    Aug 3, 2020
    Messages:
    6
    Balance:
    49Coins
    Ratings:
    +3 / 0 / -0
    My Motion Simulator:
    6DOF
    I have received my 3 50:1 gearmotors......tested it and.....Excellent......was able to use the 2nd hole on my lever(the farther one) without much change in asked current. But now my gas strut are hitting one of the motor. So I have to change the direction where my output shaft on the gearbox are facing, on 3 of the 6 motor. 1st one is done, 2 to go.

    I also ordered 3 more motor, so I'll have the 6 of them able to output equal power at equal speed.......much needed I said to myself. While waiting for those 3 more motor, I'll continue updating my wiring(espacially now that the platform and motor gearbox are not attached to the base).

    It's getting there.....I hope soon. In 2 weeks, I think I'll be able to start testing with a game. Can't wait to be there. Hope that it will work fine with VR and that motion sickness won't bring it's ugly head :).

    Photo's and videos will start appearing soon I guess :)
    See you soon for another post
    • Like Like x 1
  7. Nicolas Bolduc

    Nicolas Bolduc New Member

    Joined:
    Aug 3, 2020
    Messages:
    6
    Balance:
    49Coins
    Ratings:
    +3 / 0 / -0
    My Motion Simulator:
    6DOF
    Damn....was looking at the thing tonight. Found out that my strut will be hitting the frame when going back or forward. Probably from side to side too. Hesitating between modifying the frame.....no$ required but will weaken the base or turning the mount of the strut And putting it up: will need new Rod to support the seat and the whole thing will be higher up the ground. Dont know what to do. Will sleep on that and get back at it later.

    Will eat more of my time one way or another.....damn. Hope there won t be too many surprise waiting for me I m starting to get excited about putting it to the test.