 | | 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 (...) (19 years ago, 16-Jan-05, to lugnet.technic)
| | | | | Re: 4 section boom
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| (...) 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 (...) (19 years ago, 16-Jan-05, to lugnet.technic)
| | | | | 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 (...) (19 years ago, 16-Jan-05, to lugnet.technic)
| | | | | Re: 4 section boom
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| (...) I realised my explanation was less than perfect, so I have quickly expanded Jen's diagram to help: (URL) BTW, I am imagining a small motor will be running the first chain, because (...) The chains for sections 2 & 3 (blue and red on my (...) (19 years ago, 16-Jan-05, to lugnet.technic)
| | | | | 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! (19 years ago, 17-Jan-05, to lugnet.technic)
| | | | | Re: 4 section boom
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| (...) Nope, those are cables for the various sensors that have to reach up to the boom tip. Modern cranes like the AC500 have the ability to extend each segment separately. They use a hydraulic ram inside and a series of locking devices. If you (...) (19 years ago, 17-Jan-05, to lugnet.technic)
| | | | | Re: 4 section boom
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| (...) This series of pictures shows an AC100 extending it's boom one section at a time: (5 URLs) ROSCO (19 years ago, 17-Jan-05, to lugnet.technic, FTX)
| | | | | 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. (19 years ago, 17-Jan-05, to lugnet.technic)
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