Subject:
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Re: Liebherr LR-1750 Completion Photos
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 10 Nov 2005 15:10:49 GMT
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Viewed:
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5197 times
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>
> 30 lbs! I did not realize it took that much weight to balance the boom, but I
> guess that makes sense. 40 hrs is not much time at all for a design that big.
> Is it possible to build a crane that tall without grounded support in the rear?
> I mean is it possible to build one like that that is free-standing? That is not
> a critisism but just a question to increase personal learning.
As far as the "grounded support" that you are referring to, on the real crane it
is called the "suspended ballast" On the real LR-1750, the guys for it are
attached to hydraulic cylinders which can raise and lower the ballast.
Therefore it can be raised off of the ground when the crane rotates. I tried
doing this with pnumatic cylinders, but obviously they were not strong enough to
lift that kind of load. Instead, when I need to raise the ballast to slew the
crane, I can spool out line on the A-frame, which in turn raises the superlift,
lifting the suspended ballast off of the ground. This technique works pretty
well. I can also detach the suspended ballast once the crane has been raised to
above 45 degrees, and it will not turn over as long as I dont put too much of a
load onto it. All in all, this design worked out pretty well.
>
> It must be strong to withstand a 15 mph wind! I think you have set records with
> your cranes that may never been broken. How much can it lift? Would adding a
> load make it withstand even greater wind resistance? It sure dwarfs my crane!
So far, with that much boom installed, it can only lift a weight of 10 lbs to a
height of about 11 feet or so. If I remove the jib, I have taken 20 lbs to a
height of 8 feet. I was messing around in the garage the other day, and I was
almost able to lift a half-full keg off of the ground using the LR-1750 along
with the LR-11200. I just need to make some more counterweights, and a stronger
spreader bar, and I think that I will be able to make the lift. Stay tuned for
picture of that.
>
> Keep up the good work!
Thanks for the compliments
-Alvin.
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Message is in Reply To:
 | | Re: Liebherr LR-1750 Completion Photos
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| (...) 30 lbs! I did not realize it took that much weight to balance the boom, but I guess that makes sense. 40 hrs is not much time at all for a design that big. Is it possible to build a crane that tall without grounded support in the rear? I mean (...) (19 years ago, 1-Nov-05, to lugnet.technic)
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