Subject:
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Re: Fw: 360 deg. swiveling electrical connection
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 4 Feb 1999 17:04:40 GMT
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Original-From:
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Medical Informatics Consulting <medinfo@+AntiSpam+aros.net>
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Viewed:
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2800 times
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I am an engineer with EE training. It would not be a problem if you use
two concentric rings. One for the "live" voltage and one for a ground (or
positive and negative if you prefer that notation). This is how many real
world systems work.
Matt
R. Matthew Sailors, ME
medinfo@aros.net
On Thu, 4 Feb 1999, Tom Rowton wrote:
> Are you looking for a Lego pure solution? I have a though about some
> rotating metal disks that touch each other and are always in contact no
> matter what the rotation, but am not an EE, so I don't know if polarity
> would become an issue.
>
> trowt
> -----Original Message-----
> From: Bryan Beatty <bryan.beatty@autodesk.com>
> To: lego-robotics@crynwr.com <lego-robotics@crynwr.com>
> Date: Wednesday, February 03, 1999 5:02 PM
> Subject: Re: 360 deg. swiveling electrical connection
>
>
> Ben Kimball wrote:
>
> > Has anyone figured out a good way to maintain an electrical connection
> > between two parts separated by a 360 deg. rotating joint? Wire would
> > just twist up eventually and pop loose or tear.
>
> Daniel Miller wrote:
> >
> > On Wed, 3 Feb 1999, Tim McSweeney wrote:
> >
> > > The other options is to use a wire but not allow the turret to turn more
> > > than 180degrees either side of center, if you are at 179 and wish to go
> > > to -179 you have to go all the way back around rather than just nipping
> > > across those 2degrees. It's slower but a lot easier to implement.
> >
> > Give it enough wire and there's no reason you couldn't nip over those two
> > degrees. On the theory of the more range the better, you could let the
> > wire twist some, and get maybe +/-360 or more. Just have it re-center
> > after every attack and you should be OK.
>
> Well, if you use one of the long leads and set up the mechanics right,
> your turret could probably spin 'round a dozen times with no ill
> effects. Suppose your rotating assembly is a turret that turns both
> left and right in response to various environmental stimuli. Its
> rotation angle therefore does somewhat of a random walk over time. In
> this case, what you're worried about is what happens if it happens to
> rotate in the same direction many times in a row.
>
> If you have an angle sensor that keeps track of the turret's rotation,
> then you program your robot so that if the angle sensor is reading more
> than one complete rotation of the turret since starting the program, it
> takes advantage of "slack time" (if you can spare it) to quickly
> "de-rotate" the turret some integer number of rotations towards its
> original setting (as many de-rotations as you can spare the time for).
>
> The above approach wouldn't work too well if your rotating assembly is
> something like a wheel, which spins constantly, rapidly, and
> unidirectionally, since there wouldn't be much opportunity for
> backtracking. But for turret-like applications, I bet this would work
> fairly well.
>
> Just a thought...
> --
> Did you check the web site first?: http://www.crynwr.com/lego-robotics
>
> --
> Did you check the web site first?: http://www.crynwr.com/lego-robotics
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message is in Reply To:
 | | Fw: 360 deg. swiveling electrical connection
|
| Are you looking for a Lego pure solution? I have a though about some rotating metal disks that touch each other and are always in contact no matter what the rotation, but am not an EE, so I don't know if polarity would become an issue. trowt (...) (28 years ago, 4-Feb-99, to lugnet.robotics)
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