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Ralph Hempel wrote:
> The page on compressor comparisons is really informative. I'm
> honoured that you felt my design was worthy of testing.
>
> The reason I made it a two stroker was to "balance" the load
> on the driving system. Michael Powell's compressor tends to
> "lump" along as the pressures get high, while mine seems to
> lump at twice the rate :-)
>
> The gears were chosen over the more effective pulley because
> it minimised parts and drivetrain issues. I can tell you that
> arranging three 24T gears in a compact fashion WAS a bit
> of a challenge, as was keeping the compressor together under
> pressure.
>
> I hope the images were clear enough to figure out how to put it
> together. I had trouble figuring out how to take it apart!
>
> Thanks again for an informative article, and keep on pumpin!
>
> <http://www.hempeldesigngroup.com/lego/compressor>
>
> Cheers,
>
> Ralph Hempel - P.Eng
Hi, Ralph
Your double-acting pump is still a cool design. I like the futuristic
look. It was quite easy to build from the pictures. I had to substitute
for the tall sloped brick but otherwise I followed the images
faithfully.
Of course, I'm expecting that my tester will have to be replicated and
the results verified by others before we can pass final judgement on the
efficacy of the various compressor designs.
I'm not sure what you mean by "lumping" but if I get you right, it's not
seen in the tracings from compressors using the small pump. The speed of
pumping is fast enough. You do see the "lumping" effect in the tracings
with the designs using the large hand pump because they pump rather
slowly. But the air tank will smoothen out the "lumps". As such, an air
tank is an essential component of any air compressor set-up.
Hopefully, I've generated interest in the pursuit of the ultimate Lego
air compressor design, now there is an objective means to test them. I'm
just worried I may be indundated with requests to perform the tests :-(
PS. Oops, spoke too soon, already got one!
Cheers
--
C S Soh
http://web.singnet.com.sg/~cssoh
... where air is power
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