Subject:
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Re: Pneumatic Questions
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Newsgroups:
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lugnet.technic
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Date:
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Sun, 20 Nov 2005 19:20:19 GMT
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Viewed:
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4653 times
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In lugnet.technic, Andrew Meyer wrote:
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In lugnet.technic, Andrew Meyer wrote:
“...if you set up a system in which one tank was pressure and one was vacuum,
and applied both to a... 90d phase shift 2 cyl engine... so that when one
side of a cylinder had pressure applied, the other would be connected to
vacuum... this would involve two switches per cyl, instead of one...”
In lugnet.technic, Chio Siong Soh replied:
“...if you study how the LEGO pneumatic valve is built you know it’s not
going to work... else compressed air and vacuum (?) would be leaking from the
tanks all the time.”
Thank you Dr. Soh. I started drawing various diagrams of this hypothetical
circuit, and quickly found that it was becoming a perpetual motion machine.
Not, or course, in design or mechanics, but in impossibility. I was chasing a
chimera. The faster I drew new ideas, the faster they refuted themselves. It
was a nice dream, but it requires things that Lego just doesn’t have, namely
the sealed switch that has been longed for previously on this site. Thank
you, everybody, for your ideas on this mind exercise.
Andrew Meyer
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Hi Andrew,
Here is a schematic for an engine that combines pressure and vaccume on both
piston faces.
http://www.brickshelf.com/gallery/kclague/Computing/pv-engine.jpg
It uses the four port switch I described in this thread:
http://news.lugnet.com/technic/?n=14861
The image shows a compressor and air tanks for having pressure and vaccume
reserves.
The engine involves two pistons and eight switches. I’m not home, so I
haven’t had a chance to build and test a prototype. I’ll build one, unless
someone else beats me to it.
Kevin
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Message has 1 Reply:
Message is in Reply To:
 | | Re: Pneumatic Questions
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| In lugnet.technic, Andrew Meyer wrote: "...if you set up a system in which one tank was pressure and one was vacuum, and applied both to a... 90d phase shift 2 cyl engine... so that when one side of a cylinder had pressure applied, the other would (...) (19 years ago, 18-Nov-05, to lugnet.technic, FTX)
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