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 23:49:31 GMT
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Viewed:
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3229 times
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In lugnet.technic, Vineet Honkan wrote:
> 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?
I realised my explanation was less than perfect, so I have quickly expanded
Jen's diagram to help:
http://www.brickshelf.com/gallery/RoscoHead/etc/4section_boom.gif
> BTW, I am imagining a small motor will be running the first chain, because
> that's the way I figured out how the third section would move (set it up on the
> same line as the chain, with the axle in the same direction as the chain
> lengthwise). Is this correct for the three section boom?
The chains for sections 2 & 3 (blue and red on my diagram) do not need to be
motorised at all. All you need to do is extend section 1 from section 0, using a
chain, a rack system, or even one of John Barnes' leadscrews. You could then use
chains to extend sections 2 & 3 automatically, or string would do the job just
as well, except it stretches a bit more. I used string on my BRE-100T.
Hope this helps
ROSCO
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Message has 2 Replies:
 | | Re: 4 section boom
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| Is this why on those big cranes (Demag AC 500) there are a small set of wisible pulleys on the ouraaise left side of the boom? Thanks. Thanks for the drawing. Very helpful! Keep on building cranes! (20 years ago, 17-Jan-05, to lugnet.technic)
| | | Re: 4 section boom
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| I came across a design I did 8 months back. The way I have this drawing is that one motor operates the first section, and right beside the motor is a cable that retracts and extends the rest of the boom. I will post pics of it as soon as possible. (20 years ago, 17-Jan-05, to lugnet.technic)
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Message is in Reply To:
| | 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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