Subject:
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Re: Tower crane (WAS: Adjustable 4 wheel steering)
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Newsgroups:
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lugnet.technic
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Date:
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Tue, 28 Nov 2000 22:46:40 GMT
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Viewed:
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1302 times
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Jennifer Clark <jen@vulture.dmem.strath.ac.uk> wrote in message
news:3A23CC3E.C55DD6AC@vulture.dmem.strath.ac.uk...
> Ross Crawford wrote:
>
> > I'll use a second RCX to move all the other parts.
> > I'm looking at using the RCXs in the counterweight, but I don't think
> > they'll be heavy enough, even with 6 batteries each....
>
> I found with my mobile crane that the limiting factor really started to be • the
> strength of the boom - 6 batteries at a fair distance from the fulcrum
> represents quite a substantial load moment with respect to lego beams, and • you
> can actually see them starting to bend:
>
>
http://www.telepresence.strath.ac.uk/jen/lego/crane_lrg/crane_boom_pic4.htm
With these, the boom isnt the problem, see
http://www.transworldcrane.com/US_Standard/MajorConstruction.htm (the one on
the right). It is lifted from the end, so really only has to withstand
compression. However, the beams holding the counterweight need a lot of
strengthening.
> With a tower type crane though, I imagine you could make a far stronger • boom
> than my mobile crane... it could be interesting to see how much load these
> beams can take when assembled in the "box" type structure common to tower • crane
> booms. The best I've seen so far is Dennis Bosman's crane, which really is
> something else:
>
> http://www.geocities.com/MotorCity/Highway/2290/bmnr04.html
Wow! I hadn't seen that one before! Don't expect anything up to that
standard - I don't have the parts to co-ordinate colours like that!
Regards,
ROSCO
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Message is in Reply To:
 | | Re: Tower crane (WAS: Adjustable 4 wheel steering)
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| (...) I found with my mobile crane that the limiting factor really started to be the strength of the boom - 6 batteries at a fair distance from the fulcrum represents quite a substantial load moment with respect to lego beams, and you can actually (...) (24 years ago, 28-Nov-00, to lugnet.technic)
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