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In lugnet.technic, Gordon Bentley writes:
> 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.
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
pop apart under load, and then the rest comes crashing down.
> 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.
Well now, we'll just have to see some pics of this! You've certainly got our
interest.
TJ
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Message has 1 Reply:
 | | Re: The Big Crane At Brickfest
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| (...) It is currently only the boom base section and a hammerhead top section. They total just under 1 meter. I used beams for the chords(the vertical members at the corners), they are joined with a tile and plate sandwiching the beams. The beams (...) (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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| (...) 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. (...) (22 years ago, 26-Jul-02, to lugnet.technic, lugnet.modelteam)
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