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 15:16:14 GMT
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Viewed:
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1387 times
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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 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
Jennifer Clark
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Message has 2 Replies:
 | | Re: Tower crane (WAS: Adjustable 4 wheel steering)
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| Jennifer Clark <jen@vulture.dmem.strath.ac.uk> wrote in message news:3A23CC3E.C55DD6...h.ac.uk... (...) the (...) you (...) (URL) these, the boom isnt the problem, see (URL) (the one on the right). It is lifted from the end, so really only has to (...) (24 years ago, 28-Nov-00, to lugnet.technic)
| | | Re: Tower crane (WAS: Adjustable 4 wheel steering)
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| (...) about it. Dennis' crane is truly incredible - I am humbled. Dennis and Jennifer have set the bar so high, (fifteen feet?!?) that I can't help but feel like there's no point even trying with MOC. SRC StRuCtures - only about a third the size of (...) (24 years ago, 29-Nov-00, to lugnet.technic)
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Message is in Reply To:
| | Re: Tower crane (WAS: Adjustable 4 wheel steering)
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| Jennifer Clark <jen@vulture.dmem.strath.ac.uk> wrote in message news:3A22D54A.66E2F8...h.ac.uk... (...) Ive (...) make (...) in (...) in (...) building (...) backwards (...) the (...) Hmmm. Maybe I should stop now..... 8?) In fact, I'm doing one of (...) (24 years ago, 28-Nov-00, to lugnet.technic)
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