Subject:
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hazards of heavy lifting (Re: Crawler Crane MOC)
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Newsgroups:
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lugnet.modelteam, lugnet.technic
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Date:
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Wed, 21 Nov 2001 13:35:14 GMT
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Viewed:
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2490 times
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In lugnet.modelteam, Dennis Bosman writes:
> Hi Beat,
>
> About the lifting capacity. Seen this crane?
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=65247
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=65248
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=65287
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=48746
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=48747
>
> This guy claims it can lift more than 10 kg. I've seen this crane several
> times, but he huses to many non-LEGO components. The crane is also much to
> heavy, it almost collapst for several times on events .... He think LEGO is
> the strongest constrution material I guess ...
>
> I can asure you: don't lift too much. The bricks will break once.
Yes, be very careful! The ideal condition that a crane builder wants is that
upon maximum load, the crane starts to tip over rather than break. When the
crane starts to tip, you can immediately stop the lift and all is saved.
However, if something fails in the boom, then you can guess what will
happen. I haven't failed a crane in this manner yet, but I did test one of
my truss bridges to failure. It failed when one small truss memeber snapped
in half and the rest of the structure crashed to a heap on the floor in an
instant.
My advice on heavy lifting is to stay very close to your model and have your
hands ready. If something should go wrong then you'll be right there to stop it.
On one of my older cranes, I was lifting a heavy load when some of the
rigging broke. The load dropped and the main boom went flying backwards.
Fortunately, I caught it in my hands, but all the lifting lines went slack
and got tangled.
One other bad experience of mine happened when the main lifting line became
tangled in the upper block (at the top of the boom) and became stuck. The
winch then began pulling the boom backwards. Since the boom was nearly
vertical, it didn't have to go far before gravity took over and quickly
finished pulling the boom over backwards.
Be careful, but have fun!
TJ
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Message has 1 Reply:
Message is in Reply To:
 | | Re: Crawler Crane MOC
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| Hi Beat, About the lifting capacity. Seen this crane? (URL) guy claims it can lift more than 10 kg. I've seen this crane several times, but he huses to many non-LEGO components. The crane is also much to heavy, it almost collapst for several times (...) (23 years ago, 21-Nov-01, to lugnet.modelteam)
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