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Larry Pieniazek wrote:
>
> In lugnet.org.ca.rtltoronto, Calum Tsang writes:
> > I put together a short clip of some of the trains running around the train4
> > layout:
> >
> > http://peach.mie.utoronto.ca/events/lego/video/lego-011803-video.mpg
> >
> > It's mostly just trains driving around-the onboard footage was REALLY jerky.
> > (ie, jerky enough to cause data errors on the tape-probably due to vibration
> > from the contact)
>
> Way cool! Well worth the download. Can anyone post more details about the
> container crane? (around 00:56 footagewise) Is that a magnet or something
> else picking up the container?
Yup. We mounted a single magnet inside the container at the top, and
place 1x4 tiles above it. The crane utilized a second magnet, and the
lift cables were actually a loop of chainlink belts. If both sides of
the chain were driven simultaneously in the same direction (both down,
both up), the magnet simply lifts or lowers. But if you run them in
opposite directions, the magnet head doesn't move, but the chain
provides rotary power to the off-centre cams which brush the container,
knocking it loose. It actually works pretty well when you drive it
really slowly (aka micromotors).
I think we need a bigger lift head, with a sensor right above the magnet
which will detect when the magnet has impacted something. If we run the
crane slowly enough, we should be able to prevent the slam-down problem
we had with in the video.
Obviously, a sensor to detect when we're over the boat or the train cars
would help a lot, too.
Ultimately, if we can power either the crane or the track spur, we could
load different positions in the cars, too.
Jeff E
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Message has 1 Reply:
 | | Re: train4 Video
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| (...) Thanks, that helps a lot! Cool mechanism. (...) It's prototypical to have a cable driven thingie to shift cars around a bit on a siding so if these cars are just for show, that would work. (Count rotations?) Put the siding on a slant so the (...) (21 years ago, 20-Jan-03, to lugnet.org.ca.rtltoronto)
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Message is in Reply To:
| | Re: train4 Video
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| (...) Way cool! Well worth the download. Can anyone post more details about the container crane? (around 00:56 footagewise) Is that a magnet or something else picking up the container? (21 years ago, 20-Jan-03, to lugnet.org.ca.rtltoronto)
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