Subject:
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Re: The Big Lift
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Newsgroups:
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lugnet.technic
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Date:
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Mon, 19 Aug 2002 01:58:02 GMT
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Viewed:
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2173 times
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In lugnet.technic, Gordon Bentley writes:
> Great Crane! I am so jealous of the amount of bricks and plates you guys have.
>
> In lugnet.technic, Thomas Avery writes:
> > In lugnet.technic, Roy Nelson writes:
> > > How do you tell when the crane is about to fail?
> >
> > You have to look very closely at the crane, and pay careful attention to it
> > as the lift progresses.
> >
> > I first take the slack out of the lifting lines, and then reel in the line
> > in short bursts. Slowly, but gently, the object will begin to lift. When the
> > crane "failed", the load seemed like it was just about to lift off the
> > ground, but it wouldn't happen. I then noticed that the main structure of
> > the crane was starting to creep forward and downward, indicating that
> > something in the base was starting to give.
>
> That's what I keep finding. The hardest part of the crane to get strong
> enough tends to be the base/outriggers/crawler frames. The boom is easily
> strong enough.
Depends on construction technique. For my small mobile crane the
construction I used meant the boom was significantly weaker than normal
(bending-wise), and in fact when it failed, even though I was watching
closely, it went so fast I was unable do anything about it.
> You can add counterweights, but that just reverses the problem, the frame
> then has to support the counterweight without any load. Superlift is the
> obvious answer for crawlers and big truck cranes, but that just means more
> pieces are needed.
Indeed! The challenge with LEGO crane booms (esp. lattice) is the compromise
between strength and weight (also in the real world, but they have the
advantage of steel).
ROSCO
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Message is in Reply To:
 | | Re: The Big Lift
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| Great Crane! I am so jealous of the amount of bricks and plates you guys have. (...) That's what I keep finding. The hardest part of the crane to get strong enough tends to be the base/outriggers/crawler frames. The boom is easily strong enough. You (...) (22 years ago, 19-Aug-02, to lugnet.technic)
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