Subject:
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Re: MOC 8436: Cranetruck
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 29 Jan 2005 14:49:02 GMT
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Viewed:
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2736 times
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In lugnet.robotics, Iain Hendry wrote:
> "Nathanael kuipers" <kuipers_n@hotmail.com> wrote:
>
> > Unfortunately it didn't work flawless but I think the main reason for that is
> > the car; it was quite hard to build with the 'factory'. The worst thing is they
> > asked me to design the car, so actually it's me to blame.... :-P
I'm not sure I agree with that. There were, as I recall, some difficult
insertion steps but overall, it seemed buildable. The root problem in my view is
just that the mean time to failure of individual constructed components (given
reliability achievable with LEGO) and the high component count meant that at any
given time, something isn't working. That and the very high number of
component/component interactions that you have to program correctly.
> (Thanks Larry and Nate for the background on this project!)
>
> You have to undestand how inspirational this is to me. For the past few
> years, on-and-off I am working on building a little LEGO duck assembly
> carousel. I haven't made much progress - I've played around with
> 4-posiotion, 6-position rotary dials, flirted with the idea of a pallet
> conveyor (difficult) and a few other ideas running around in my head. The
> duck only has 3 pieces and I had a hard time with that! I hvae no excuse
> not to build something operational after seeing this creation... anything is
> possible! :)
>
> It is of espical interest to me becuase of the industry I work in - I will
> have to take this in and show it to the other two designers at our company.
> We design and build custom automation and robotics for handling of plastic
> parts and assembly of the parts, so this is right up our alley!
What I think is coolest about this project is that there is an RCX on board each
of the carriers and it communicates (via IR) with the workstation that it
arrives at to say what assembly sequences should be executed... in theory it
would be possible for different carriers to carry assembly requests for
different cars!
The carriers were used to reduce dependence on an overall conveyor working
correctly, I think.
(I find this stuff interesting as well because much of my HS summer work and
some of my during college summer work was at Control Engineering, a division of
Jervis B. Webb, which among other products, makes driverless guided vehicles...
since this was the 1970s and early 80s, the onboard control was done with small
scale discrete logic rather than a CPU, but the principles of vehicle/cell
communication are similar)
++Lar
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Message is in Reply To:
 | | Re: MOC 8436: Cranetruck
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| (...) is (...) they (...) (Thanks Larry and Nate for the background on this project!) You have to undestand how inspirational this is to me. For the past few years, on-and-off I am working on building a little LEGO duck assembly carousel. I haven't (...) (20 years ago, 29-Jan-05, to lugnet.robotics)
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