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Showroom **RIP** - 6DOF project using 12v DC Motors, Sabertooth 2x60's (was MM's) and Arduinos + OSW

Discussion in 'DIY Motion Simulator Projects' started by SilentChill, Jun 2, 2015.

  1. SilentChill

    SilentChill Problem Maker

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    Yeah go on get outta my thread !! :p
    • Funny Funny x 1
  2. helisfreak

    helisfreak Member

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    By now you're probably received all the compliment.... Spend a few hours going through your entire thread.... I like your approached, just get it done and screw the math. :)

    But I do have a dumb thought/question. It seem to be all of the 6DOF system I see out there are a bit over exaggerate the movement? No, I have never been in a real racing car going at 200mph, maybe that's how it behave. But by commonsense, most of the 6d0f seem to pitch up and down so much. I have drove a Nissan GTR, though with a lot of power, doesn't seem that much. But then again, I have never tried a 6d0f sim, so it may not feel as much as the video?
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  3. SilentChill

    SilentChill Problem Maker

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    When you have the Rift on it does feel really good. I have less movement on this than on my 3DOF and this feels far far better.
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  4. mrbeginner

    mrbeginner Active Member Gold Contributor

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    How much movement you have now? Do you use all what motors give and could you tell example the dirt settings what motor use what force?
  5. SilentChill

    SilentChill Problem Maker

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    I have had to shorten my CTC to 50mm now ads my motors are over heating after prolonged use. So i need bigger motors i think but its still really good for racing.

    This my latest video.

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  6. Alexey

    Alexey Well-Known Member

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    If you are brave enough try drilling/filing some holes in one end the case of the motors (making sure not to drill through the magnets) and on the far end of the motor (where the brushes sit drill some bigger holes and mount a fan to it. I have one motor that I accidentally burnt out, cleaned it up and got it working again but it would overheat after 10 mins of use. Since I've added the fan it stays cold. I'll take some pictures of what I've done to the motor. maybe by doing this you won't have to buy new motors.
  7. SilentChill

    SilentChill Problem Maker

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    I have put heatsinks on the brush ends also added fins to the motor body with 120mm fans top and bottom. It's the brushes which are over heating in turn making the entire coil overheat. Suppose that is why they are only rated at 14 amps. They are powerful enough to lift me and the rig with 150mm CTC levers but very quickly over heat
  8. Alexey

    Alexey Well-Known Member

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    This is how to cool the brushes:

    [​IMG]

    So not just adding a heat sink to the case of the motor but actually passing air through to the armature and brushes.
    As you can see I've cut out holes where the motor case connects to the gearbox and placed the fan on the opposite side. What you can't see is that I have also drilled holes in the end plate allowing the fan to draw in cool air and blow out the hot air. I have also fashioned an air tight shroud so that the fan only draws air from the cutout holes.
    • Useful Useful x 2
  9. SilentChill

    SilentChill Problem Maker

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    Thanks @Alexey i will try and do something like that see what I can make up.my brushes do get very hot and there is no air circulation in the motor housing so this looks like a good mod :)
  10. Pit

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

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    IMHO I do not agree - the motion is very reactive and the the motors seem to be strong enough to react in time. Save the money for a DD or something else :)
  11. Nick Moxley

    Nick Moxley Well-Known Member

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  12. SeatTime

    SeatTime Well-Known Member

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    How about wrapping copper pipe around the hot end of the motor and pumping cooled water through it like a CPU cooler.
    • Optimistic Optimistic x 1
  13. Alexey

    Alexey Well-Known Member

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    I think that by only cooling the case you don't actually cool the brushes enough unless the brushes themselves are mounted directly to the case. The brushes in mine are mounted via a fiberglass board, so I had no choice but to get airflow over them. That pumping idea looks neat.
    • Agree Agree x 1
  14. BlazinH

    BlazinH Well-Known Member

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    From my experience, wrapping motors with copper tubing and using water-cooling will extend the time needed before a cool down period is required. The problem with brushed DC motors though is that the armature, which is in the middle of the motor, is what gets hot first along with the brushes. So cooling on the outside of the motor is not that efficient since the heat must propagate into the outer casing first.

    But while this helps somewhat to control the heating issue, it doesn’t do anything to address the issue of why so much heat is being generated in the first place. The only way to do that is to reduce the amperage the motors draw. If your case is like mine, if you don’t reduce the current, you will quickly burn thru motor brushes thus requiring replacement often.
  15. mrbeginner

    mrbeginner Active Member Gold Contributor

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    What if you put every corner gas struts without damping to help lifting like this guy.

    I have seen the video where he lift 180kg with those 4 wiper motor when he have 4 gas struts connected.
    Look closely and you see how the struts move under the chair.
    • Informative Informative x 1
  16. SilentChill

    SilentChill Problem Maker

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    Dont make much of his slippers lol

    Thats a good idea though, where can you find such a thing ??
  17. SilentChill

    SilentChill Problem Maker

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  18. SilentChill

    SilentChill Problem Maker

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  19. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    I have had a guy who is well over 130kgs on my compact sim over the last couple of days, so having an assist certainly helps. In my case the adjustable heave spring was still on its softest setting and it handled 130kgs just fine with 2 X 60:1 and one 25:1.
    • Informative Informative x 1
    Last edited: Aug 8, 2015
  20. mrbeginner

    mrbeginner Active Member Gold Contributor

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