Subject:
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Re: On LEGO Compressors & Pump Testing
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Newsgroups:
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lugnet.robotics, lugnet.technic
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Date:
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Fri, 22 Nov 2002 20:46:35 GMT
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Viewed:
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390 times
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Hi guys,
You all missed this page about a year ago, I presume.
My double stroke compressor, with build-in 9V power-supply and automatic
on-off switch. When used in combination with an airtank, it stops
pumping when your desired max. pressure is reached. More or less rubber
belts can increase/decrease you max. pressure-needs.
Super compact design, with absolute minimum use of parts. When I
designed it I had to build it in my 8862. Any existing design didn't
fit, so...
The trick with this thing is the lack of strain on the bricks. No need
for vertical connectors. It keeps the whole thing very small and
compact. Try it for yourself. I think/hope the pics give enough detail
to copy it.
http://home.planet.nl/~groen711/lego/Compressor/Lego-compr.html
Our well-known Jennifer uses this design too, in her hand-held control
units.
I haven't tested it, I just use it, and it works perfect.
Anyone care for a heavy-duty test?
If Soh approves it :-) I would be honoured if he would incorporate my
pictures in his outstanding files about compressors.
Happy testing and pumping!
Klaas H. Meijaard - Zetten - The Netherlands
Lugnet 291
c s soh wrote:
> Thomas Avery wrote:
>
> > In lugnet.robotics, Gaurav Thakur writes:
> >
> > > This is probably my favorite Lego-related website out there. :) Great
> > > article there too; I need to try that pressure test sometime.
> > >
> > > So are the handpumps or the minipumps generally better for compressors? I am
> > > currently building a model which uses a couple of the small pumps, but that
> > > was mainly due to space restrictions; it might be worth trying to replace
> > > those with handpumps and see how the model operates.
> >
> > I think Soh's previous tests showed that motorizing the large hand "pumps"
> > (compressors) provided no extra benefit over the small pumps. This new test
> > by Charles Steadman (excellent work, BTW) shows that motorizing two large
> > hand pumps can be more beneficial than motorizing the little ones.
> >
> >
>
> I understand why compressors using large pumps are still around - many
> people simply don't have the little ones. Whereas they are likely to own
> the large pump which comes along with the Technic pneumatics sets
> (except 8868 which includes a small pump motorized compressor). So a
> page has been done up for them at:
> http://www.ozbricks.net/cssoh1/compress/compbig.htm
>
> But the small pumps are now more easily available in the 5218 Pneumatics
> pack and also in the 3800 Ultimate Builder's Set (where it's in blue).
> These sets include designs for using the small pump as an air
> compressor.
>
> I was delighted to receive Charles' dual large pump design as it
> appeared to beat the minipump compressor. I agree that pressure
> measurements alone are insufficient, compressor tests should also be
> done under load. I always follow up pressure measurements with a dynamic
> test in which the compressor is connected to drive my 2-cylinder engine
> (which btw is based on the pneumatic control loop that I learnt from
> Eric Brok). This is a more stringent test than the simple control loop
> of three cylinders in Charles' test setup.
>
> I built and tested Charles' design and was rather disappointed that it
> didn't performed as well as it should. With both motors running, the
> dual large pump compressor was barely able to move my 2-cylinder engine
> with intermittent stops to regain pressure.
>
> On the other hand, with Ralph Hempel's improved double acting pump, the
> engine could be
> kept continuosly moving albeit slowly.
>
> Since Ralph's pump uses only a single motor, so to provide a fair
> comparison, I repeated the test running Charles' compressor with only
> one motor. It stalled immediately it was connected to my 2-cylinder
> engine.
>
> I think the reason is that the large pump is too stiff (even without the
> spring) to be used in a motorised compressor. LEGO designed it to be
> operated manually, in which situation it works very well indeed.
> Previous experience had shown that the LEGO 9V geared motor needs
> further 5:1 gear reduction to be able to move the springless large pump.
>
> So I think Ralph Hempel's improved compressor still stands as the most
> efficient motorised air compressor, in terms of performance and economy
> of parts. But of course, for most pneumatic applications, nothing beats
> the large hand pump operated manually like crazy!
>
>
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Message is in Reply To:
 | | Re: On LEGO Compressors & Pump Testing
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| (...) I understand why compressors using large pumps are still around - many people simply don't have the little ones. Whereas they are likely to own the large pump which comes along with the Technic pneumatics sets (except 8868 which includes a (...) (22 years ago, 22-Nov-02, to lugnet.robotics, lugnet.technic)
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