Subject:
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Re: My Latest MOC: 1.4m Boom Crane
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Newsgroups:
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lugnet.build, lugnet.technic
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Date:
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Thu, 8 Feb 2001 21:23:39 GMT
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Viewed:
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1794 times
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WOW!! Thats amazing,
I'm stunned.
Gary
P.S. When do we get pictures of the cubicle devider?
Jeff Elliott <jeffe@telepres.com> wrote in message
news:3A82C528.A3B8C3B5@telepres.com...
> Hi all,
>
> Thought I'd post a photo of my latest creation, a technic boom crane.
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=31827
>
> The genesis of this MOC is that I'm building a Lego cubicle divider at
> work. Naturally, for such a large scale project, a large crane is
> needed (duh! :D) So I set about building the crane first...
>
> The main boom is about 1.4m from tip to hinge. The counterweight is a
> 1.5kg SCUBA lead weight (wrapped in plastic, of course), but that can be
> doubled if I'm lifting heavy loads.
>
> There are four controls for the crane:
>
> 1 - Turntable rotation (1:3, 1:56)
> 2 - Counterweight positioning (1:24)
> 3 - Boom up/down (1:24, medium spool, 1:4 pulley reduction)
> 4 - Hook up/down (1:24, large spool, 1:2 pulley reduction)
>
> All motive force is from single 'new' 9v technic motors, powered from a
> polarity-switch / train controller setup, except the hook which is
> driven off a battery pack 'cuz I ran out of polarity switches :).
>
> The control is pretty fine once you get used to the swinging inherent in
> starting and stopping so heavy an object.
>
> Manual control of the counterweight is essential to not tipping the
> crane; if you try to lift a heavy weight with the boom out, it requires
> the counterweight to be moved all the way out, etc.
>
> You also have to be cautious not to collide the erect boom with the
> ductwork under the ceiling :)
>
> I've trained two folks at the office in how to operate it; I've
> sabotaged the controls and gearing so that you need inside knowledge in
> order to move it from its rest position :)
>
> I'd be interested in discussing power and gearing solutions with others
> who have developed high-load cranes... I notice that some of my gear
> boxes are creating plastic dust with heavy usage, a sure sign that I
> need to reconsider the gearing that I'm using.
>
> I'm afraid I don't have much background knowledge of how cranes really
> work, so I just slapped together something which functioned through
> trial and error, but I'm pretty happy with the result. If anyone has
> comments on things I'm obviously doing wrong, let me know...
>
> And if you'd like better photos, give me instructions as to what you'd
> like to see; I've got a digital camera and the crane sitting on the desk
> here beside me, so I can oblige easily and quickly.
>
> Two Lego pieces were modified in the construction of this crane
> (something I usually abhor): I redrilled the two uptake spools (technic
> wheel hubs) so that the threading hole would accept the heavier cord I
> used. The original hole was only large enough for thread; I widened it
> to 3/32". I guess I have so many wheels that I don't feel *really* bad
> about doing this :(
>
> Thanks!
> Jeff Elliott
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Message is in Reply To:
 | | My Latest MOC: 1.4m Boom Crane
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| Hi all, Thought I'd post a photo of my latest creation, a technic boom crane. (URL) genesis of this MOC is that I'm building a Lego cubicle divider at work. Naturally, for such a large scale project, a large crane is needed (duh! :D) So I set about (...) (26 years ago, 8-Feb-01, to lugnet.build, lugnet.technic)
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