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Help choosing the right kind of 2dof for me.

Discussion in 'DIY Motion Simulator Projects' started by mariano68, Apr 26, 2015.

  1. mariano68

    mariano68 Active Member

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    My Motion Simulator:
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    Sure! will try to do something better for the POTs today and will post a video asap!

    My wife called it the same... She didn't want to seat on it yet :grin

    Thanks!
    I will make a cover for the motors, etc., so all the stuff will be hidden.

    Also I have to make something to hold a fan at the back of the wipers.
    • Funny Funny x 1
  2. mariano68

    mariano68 Active Member

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    My Motion Simulator:
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    Sadly I cant take a video right now, as my phone
    slipped out of my hand and got crashed, so no phone for some days.
    The chair is moving, it looks like it has a soul on his own right now, but I hope I can tame her soon ...
    BTW, One of the motor gets some electric (burning) smell, it isn't even hot but smells anyway, any clues?
    Last edited: Jun 4, 2015
  3. mariano68

    mariano68 Active Member

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    My Motion Simulator:
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    Basic video with the tablet

    It's a chair, and it moves :nerd
    Lots of problem with the pots placement, keeps getting out of sync :(
    • Like Like x 1
  4. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Thanks for the video, it is great to see it moving.

    Have you load tested it yet and if so how does it feel with yourself on board?
  5. mariano68

    mariano68 Active Member

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    You're welcome
    Yes, I tested with rfactor, it feels too rough, needs a lot of tweaking, but at least moves me without problems, and I'm about 110kg... I think I took the right decision to not to make an upper structure and fix the motor directly to the chair.
    I will have to change the way I put the left motor as it doesn't pair with the right motor fast side and it is really annoying when brake and accelerate, also the left motor loose centering too fast, I will have to try a different approach on the POTs placement.
    Could you share with me some presets as your Sim has the motors in the front like mine?
    Thanks anyway!
    Last edited: Jun 4, 2015
  6. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    Sorry, I have both my sim and computer in bits at the moment for some updates, and will be for a while as I am waiting on some parts, so I can't grab any presets.

    Though to be honest even though two sims may share a somewhat similar design they are very different in terms of geometry and hardware. Hence a preset may be a guide to getting something moving but I have found it is far better to understand how to work though creating and tweaking a motion profile for your own sim. There is plenty of info, guides and tips in the FAQs, it takes time but do one force at a time and work your way through, it will give you much better results than any preset: http://www.xsimulator.net/community/faq/simtools-settings-tips-and-tricks.18/category

    A glimpse of my current chaos!
    20150603_113540.jpg
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  7. mariano68

    mariano68 Active Member

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    Wow! Katrina hurricane was there!:eek:
    Thanks for the link!:cheers
    • Funny Funny x 1
  8. mariano68

    mariano68 Active Member

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    Well, nothing good to report :(
    I'd installed the POTs in the shaft, and being there blocks the motor levers when it reaches 180 degrees if the motor goes wild, good to not break the POT, but bad for the motor as it keeps trying to turn, end results, one motor is half baked...
    On the other side, the motomonster is giving the motors less than 12v now, 10v at top in SMC3tool pwmmax, so motor can't cope the weight.
    Also, I tried to read all the info and manuals for tuning Simtools, and can't get any game to run half decent, I'm really disappointed...
    I will take some days until I get new interest in the project and money for new motors maybe.
    Last edited: Jun 9, 2015
  9. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    Setbacks are never easy.

    @Pit and others can provide advice on the Arduino/MotoMonter problems. It pays to provide clear photos of screenshots and take a step by step approach confirming what you have done.

    Same goes for SimTools, once you have the Arduino/MotoMonter problems sorted post screenshots of all your settings and members can help you get your settings and profiles sorted.

    Based on my own experience I do think you face some challenges with wiper motors in a compact design. There are some things you can consider doing, like having the smallest possible CTC lever, though that will impede speed, increasing the leverage length as much as possible and raising the connection point for the rods over the COG.
    • Like Like x 1
  10. Pit

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

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    My Motion Simulator:
    DC motor, Arduino, 6DOF
    I would like to underline that, like @noorbeast (who helps so much) I am willing to help but earliest over the next week-end due to much office work at the moment. No much time for driving, too ;)
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  11. mariano68

    mariano68 Active Member

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    Thanks very much guys!:cheers I hope to post pics and etc for troubleshooting on the weekend, as I said I will take some days to regain some spirit (to call it in some way).
    BTW, motors here are really expensive, but I found some 12v car jacks for relatively cheap (half of a winch)similar to this one:

    The specs are not so good, 80watts motor, but the reduction looks good (part metal) and strong, maybe the speed is not enough (not listed but you can see in the video that would be about 30rpm).
    Other motor I found affordable is this heavy duty 30NM gearmotor, but I don't have info on Watts or speed:
    [​IMG]
  12. Alexey

    Alexey Well-Known Member

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    Have you tried to open up the fried motor to fix it? It could be something as simple as a burnt commutator.
    If you are just going to throw the motors away I would try to fix them first as you have nothing to loose and knowledge to gain!
  13. mariano68

    mariano68 Active Member

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    Thanks Alexey for your reply!
    The motor works if I move the outside shell, but NOT very well, once opened, the winding shows half of the upper part of the copper with some burned color. I think the only way to get it fixed is to redo the winding (I hope thats the name of the copper wire).
    Tomorrow I will post a pic of it.

    Edited
    Last edited: Jun 10, 2015
  14. mariano68

    mariano68 Active Member

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    I got a new motor, well, not the motor alone, an electric car jack :grin.
    Specs on the motor 12v 13amp, and after dissection 50:1 gear and about 55RPM at shaft.
    Now I have to cut the shaft, solder the lever and a mounting braket.
    I'm thinking on letting the shaft as long as the motor and put a bearing holding it.

    20150629_171229 (Large).jpg

    Also, I got an used Logitech DFGT that came with a "Virtual copkit" for free.
    virtual-cockpit.jpg

    As I want to mount the motors at the feet, I'm thinking how to adapt this gizmo to fix it to my chair and also fix the motors at the other end.
    Any advice will be welcome :).
    20150629_165730 (Large).jpg 20150629_165751 (Large).jpg 20150629_165832 (Large).jpg
  15. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    • Like Like x 1
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  16. mariano68

    mariano68 Active Member

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    Thank you @noorbeast! Already watched them!
    The Jack motor is a little noisy, not as much as the winches, but I think that filling the gearbox with grease and doing a little modification in the shaft would make them a little more silent, also I plan to do a box filled with sound deadening mat that will hold the motors, psu and electronics, with some ventilation of course.
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  17. mariano68

    mariano68 Active Member

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    Hi guys!
    Well, been busy with life, also I lost my "my documents" folder after my backup disc died after I backed up prior to a format :mad:, so I lost a year of work documents, and research and pictures of simulators, really sad:(
    Anyway, I have the electric jack modded, look at it :)
    jack mod (Large).jpg
    I will try it tomorrow to see if it works good enough, if it is ok, I will get another one and do the same and build a foot mounted full 2dof.
    • Creative Creative x 1
    Last edited: Jul 18, 2015
  18. mariano68

    mariano68 Active Member

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    Hey guys, finally I tested the modded E-jack today, it was a total success!!! I replaced the broken wiper motor with it and it is notably stronger and noise was acceptable. I even used a 60mm ctc lever where the wiper with 25mm ctc struggled and I had to hold the chair!
    I will be getting another one on Monday, will do the mod, and I hope I will have the new sim ready this week!
    • Like Like x 1
  19. WhiteGoblin

    WhiteGoblin Member

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    It looks like the entire design relies on that set screw. Are you able to get that tight enough to not have any slippage under load?
  20. mariano68

    mariano68 Active Member

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    That set screw is against a flattened face of the shaft, so it is not a weak point.
    Anyway, worked fine in test, will see once the sim be ready.