Subject:
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Re: first pics of crane
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 29 Jul 2004 00:41:45 GMT
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Viewed:
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3779 times
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In lugnet.technic, Jennifer Clark wrote:
> In lugnet.technic, Ross Crawford wrote:
> >
> > Yummy. One thing I'd like to look at one day is the possibility of using a
> > leadscrew arrangement and locks inside the boom like most cranes use these days,
> > so that each section can be extended individually. But that is probably a
> > pipe-dream...
>
> I really like the system you mention, it is a really elegant solution. It also
> appears to allow more telescoping sections, presumably to due not having
> additional complexity with each added section, unlike a cable driven section,
> and perhaps less mass since there are no cables. I would imagine you would
> really need an RCX for this though, since the boom sequencing could get pretty
> complex to do manually.
From what I saw on the AC100
http://www.brickshelf.com/cgi-bin/gallery.cgi?f=25642 the operator just dialed
in the length they wanted, and the pooter chose the position of each section (in
that case it was fully extended anyway so not a difficult calculation). Each
section had (IIRC) 3 different locked positions.
With a LEGO model I think it would be possible to do fairly simply, the biggest
problem would be finding the room inside the boom for the locking mechanism.
> Are you sure they use a leadscrew as opposed to hydraulics though? I thought I
> saw a leadscrew used on the Demag AC60 city crane at one point, but after
> thinking about it I wasn't sure if this was used for boom extension of pinning
> each section.
LOL no not sure at all - in fact I'm pretty sure most (if not all) use
hydraulics, I was sorta mixing real life with LEGO restrictions.
The downside to this system is that the innermost section needs to be hollow and
large enough to fit the cylinder/leadscrew through the centre. That would mean a
cross-section at least 4 studs I would think. That's gonna make the whole
assembly very big if you wanna do several sections.
You could possibly run the leadscrew through a line of 1x2 technic bricks, but
that would result in a weaker section, and you still need to have some way to
lock it.
But I'd love to see what you can come up with ;)
ROSCO
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Message is in Reply To:
 | | Re: first pics of crane
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| (...) I really like the system you mention, it is a really elegant solution. It also appears to allow more telescoping sections, presumably to due not having additional complexity with each added section, unlike a cable driven section, and perhaps (...) (20 years ago, 28-Jul-04, to lugnet.technic)
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