Subject:
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Re: Parts Question about the Super Street Sensation...
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Newsgroups:
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lugnet.general
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Date:
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Wed, 4 Oct 2000 17:32:02 GMT
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Viewed:
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1497 times
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Many thanks, Bianca - this gives me a much better idea of their (un)
suitability to my application.
BTW: since they are indeed pnuematic, why does the catalog describe them as
hydraulic - idiot ad writer maybe??
-Derick
In lugnet.general, Bianca Nebab writes:
>
> "Derick Bulkley" <Derick@derick.com> wrote in message • news:G1w2t8.n32@lugnet.com...
> > D.M.Garcia,
> >
> > thanks for your reply - i have some follow-up questions.
> >
> > (Please forgive my use of pnuematic below, when in fact I meant hydraulic.)
>
> Actually, pneumatic isn't technically inaccurate. The cylinder uses air • pressure to
> slow the rate of extension of the piston.
>
> >
> >
> > In lugnet.general, Damian Garcia writes:
> > >
> > > "Derick Bulkley" <Derick@derick.com> wrote in message
> > > news:G1vpBq.K73@lugnet.com...
> > > > Regarding the pnuematic cylinder:
> > > > how many are included in this set?
> > > 2 (4 if you include the replacements that will be required)
> >
> > I don't understand the reference to replacements...
>
> The early lots of this set came with defective cylinders in which the plastic • holding
> the spring cracked under the pressure of the coiled spring when the cylinder • was in
> the tense position. LEGO CS replaces them if they do break down. I have 2 • 8448s.
> The cylinders of the first one I bought when the set first came out (10/99 in • NJ,
> USA) failed about 6 months after I assembled the set and both had to be • replaced,
> thus, the "4 if you include the replacements" D.M. referred to. I used the • cylinders
> from the second set I bought a few months later as replacements. These are • still
> okay, though I haven't checked them lately. Looking at the broken down ones • and how
> the plastic virtually disintegrated rather than really cleanly cracked, I am
> wondering if part of the problem was the grease they used inside the air • chamber
> reacting with whatever kind of plastic they used for the first lots. The new • ones
> don't look much different than the old ones from a design standpoint, but • perhaps
> they thickened the plastic where it broke down earlier. Anyway, so far, so • good,
> though I'm going to wait 8 months with the second set before I consider them
> non-faulty.
>
> >
> > > > Is the part contained in any other sets?
> > > Several others: Okay, 2 that I can think of...
> >
> > And they would be...?
>
> 8446, 8445
>
> >
> > >
> > > > What is the action like - does it simply provide consistent resistance to
> > > > motion in either direction (compression and extension)?
> > > It is designed for extension. It will compress as fast as you can squeeze
> > > it, but it extends slowly. Think of it as a slow moving shock.
> >
> > When fully extended, does it exert a pressure to re-compress?
>
> No. The tension is one-way (to extend).
>
> >
> > > >
> > > > I am considering their value in a current project, in which a large • structure
> > > > must be dampened because a tendency to rock.
> > > If shocks don't work, I don't see how the pneumatic cylinders will.
> >
> > That is why I am asking how they work.
>
> The spring supplies the tension that makes extension the natural position of • the
> part. You have to compress the piston manually. Once you release it, the • pneumatic
> chamber has a suction end that slows the rate of extension. From what you've
> mentioned, it sounds like old-fashioned shock absorbers should work as well • as these
> "hydraulic" pistons would, unless you really need the recoil from the • dampening to be
> slowed. If you'd like, I can email you a scan of one of my broken cylinders • (a 22K
> jpg). You can figure out its operation by looking at it, as well as see the • design
> flaw of the first ones released. Let me know.
>
> HTH,
> binky
>
> >
> > regards,
> >
> > derick
> >
> >
> >
> > >
> > >
> > >
> > > --
> > > --D M Garcia
> > > http://www.geocities.com/dmglego/
> > > "An expert built the Titanic, an amateur built the Ark"
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Message has 1 Reply:
 | | Re: Parts Question about the Super Street Sensation...
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| "Derick Bulkley" <Derick@derick.com> wrote in message news:G1x21E.2Mp@lugnet.com... (...) That is what I meant about regular shocks not working in my first reply. The "hydraulics" function basically the same as shocks. (...) as (...) I think Lego (...) (26 years ago, 4-Oct-00, to lugnet.general)
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Message is in Reply To:
| | Re: Parts Question about the Super Street Sensation...
|
| "Derick Bulkley" <Derick@derick.com> wrote in message news:G1w2t8.n32@lugnet.com... (...) Actually, pneumatic isn't technically inaccurate. The cylinder uses air pressure to slow the rate of extension of the piston. (...) The early lots of this set (...) (26 years ago, 4-Oct-00, to lugnet.general)
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