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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Mon, 21 Nov 2005 15:04:15 GMT
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Viewed:
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4424 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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Andrew,
It is so interesting that you broached the topic of vaacume/pressure pressure
at the same time as the hydraulic question. In many ways they are the same
problem. Containment.
With vaccume/pressure you need a switch with containable exhaust, otherwise
the uncontrolled exhaust leads to a leaking system that cannot work.
With hydraulics, you need a contained system, else you end up with hydraulic
fluid dripping from the machine.
I’ve never really gotten into the hydraulic concept, but I think I’m going to
have to try, but first I’m going to finishing solving/proving your pressure
vaacume engine question.
I often get inspired when people say it can’t be done, so I thank Dr. Soh for
that bit of inspiration also.
Kev
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Message has 1 Reply:
 | | Re: Pneumatic Questions
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| (...) No - exhaust! (...) You need to eventually discharge the compressed air (or vacuum) in a pneumatic system. Interestingly enough, this is the first time I heard of a pneumatic system using compressed air and vacuum at the same time. Usually (...) (19 years ago, 21-Nov-05, to lugnet.technic)
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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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