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In lugnet.technic, Dennis Bosman writes:
> 9.5 pounds = ... kgs??? Sounds heavy, so the crane has a great lifting
> capacity. Is the boom strongs enough??? You have to take care of sufficient
Dennis,
Booms made of Technic beams like this are remarkably strong. I am working on
a crane as well (who isn't!) and have tested the boom to 100Kg direct load
and it doesn't even look like moving. I was pretty amazed about this result
myself.
So far I've finished the rotating frame, boom, A-Frame and winches,
turntable and cross-frame. Testing with this on a flat base, I find the main
limitation is the load that the winches will take without the gearbox
pulling apart. I have succssfully lifted 12 Kg with a 4:1 block. At 16 Kg,
the winch broke, but the rest of the structure is fine. These are controlled
lifts where the weight is picked, either luffed, or rotated and put down
again. Note I am working at Technic Figure scale of around 20:1. My ultimate
goal is to lift 40-50 Kg.
Now I've just got to keep buying sets to get enough parts to complete the
crawlers. And some pulleys for a bigger set of blocks.
Regards
Gordon
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Message has 2 Replies:
 | | Re: The Big Crane At Brickfest
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| (...) Yep, that is pretty amazing. Got any pics? How long is the structure, how is it constructed? The problem, or rather potential problem, with a Lego truss is that failure is catastrophic (and I speak from experience here). You'll have one joint (...) (22 years ago, 26-Jul-02, to lugnet.technic, lugnet.modelteam)
| | | Re: The Big Crane At Brickfest
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| Gordon, When you wan't to lift such a heavy load the technic axles are too weak. So you have to use other materials than LEGO. I've made a 4.2 metres high Liebherr LG1550 and know how far you can go with it. A hundred kg's seems impressive, but is (...) (22 years ago, 29-Jul-02, to lugnet.technic, lugnet.modelteam)
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Message is in Reply To:
| | Re: The Big Crane At Brickfest
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| Thomas, (...) Sounds interesting! (...) Only 71 hours, that's not much for such a high tech crane. I wish I could see the crane in real once. It would be great if you can show on the Modelshow Europe ;-) The visitors like the LEGO models! Especially (...) (22 years ago, 25-Jul-02, to lugnet.technic, lugnet.modelteam)
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