Subject:
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Re: 4 section boom
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Newsgroups:
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lugnet.technic
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Date:
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Sun, 16 Jan 2005 21:36:19 GMT
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Viewed:
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2774 times
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In lugnet.technic, Vineet Honkan wrote:
> I understand how this works (using the chain to extend the third boom). What is
> now confusing me is how this would be used in a 4 section boom, or do the lego
> crane builders use a different approach to these booms? If so, could someone
> explain to me how they set up the booms like these? I am very curious and would
> like to learn for my crane (which I will build once I get the CAD design done).
> Thanks for your time.
Hi Vineet,
A 4 section boom can be done as a simple extension of the same 3-boom system
explained on Jennifer C's page. Imagine a 4th section on the left, enclosing the
current diagram, and just copy the same pulley system from current sections 1-3
to sections 2-4. Then when you extend section 3 from the new section 4, it will
automatically extend section 2, which will in turn extend section 1.
This system can be extended to as many sections as you want. Note however that
the more sections you add like this, the more friction is involved, the more
mechanical advantage is reduced (each section extends N times faster than the
first), and thus the harder it will be to extend the boom. I imagine maybe 4 or
5 sections would be the limit before you start breaking LEGO parts. But I would
love to be proved wrong ;)
ROSCO
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Message has 1 Reply:
 | | Re: 4 section boom
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| So if I were to use a chain, and if it were to move the third section and it were fixed on to the second section, all I wouldhave to do is add another chain and fix it onto the third section? Would this work? BTW, I am imagining a small motor will (...) (20 years ago, 16-Jan-05, to lugnet.technic)
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Message is in Reply To:
| | 4 section boom
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| I understand how this works (using the chain to extend the third boom). What is now confusing me is how this would be used in a 4 section boom, or do the lego crane builders use a different approach to these booms? If so, could someone explain to me (...) (20 years ago, 16-Jan-05, to lugnet.technic)
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