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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Thu, 17 Nov 2005 17:13:08 GMT
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Viewed:
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4570 times
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In lugnet.technic, Kevin L. Clague wrote:
> In lugnet.technic, Andrew Meyer wrote:
> > I am comtemplating the purchase of one of those one-way valves from the old
> > pneumatic sets. I was wondering, if you set up a system in which one tank was
> > pressure and one was vacuum, and applied both to a 2-cyl engine, would it turn
> > with more power than a regular engine? What I mean to describe is an engine that
> > is similar to the 90d phase shift 2 cyl engine that you can find on Dr. C.S.
> > Soh's pneumatics page, reworked so that when one side of a cylinder had pressure
> > applied, the other would be connected to vacuum. I realise this would involve
> > two switches per cyl, instead of one, which is why I am asking in the first
> > place. Would the extra power from the cyl be enough to drive the extra
> > resistance of the added switches, and end up with more power than a traditional
> > engine, or would I be better off just sticking to the traditional engine and
> > just feeding it more air faster? Sorry if this post is confusing, I am writing
> > it at 21:35 CST, and I've had the month of my life this week. Five days without
> > sleep...
> >
> > Andrew Meyer
>
> This is a good question.
>
> When using traditional pressure only, the force producde by the air pressure on
> the faces of the pistons is enough to flip a switch.
>
> Just yesterday someone asked me "If instead of using pressure, you used vaccume"
> would your walker walk backwards. I'd never thought of this, but it sounds like
> an interesting concept. My initial reaction was that there would phase issues
> that would prevent this from working.
>
> But you are talking about a different case. Lets ask a slightly different
> question than yours. Could I make a pneumatic engine like Dr. Soh's that runs
> purely on vaccume? I think the answer is yes.
>
> So the pressure half of the engine has enough power to flip one switch, and the
> vaccume half of the engine has enough power to flip another switch. Combined
> then, it would seem that you could make both switches flip.
>
> Let us know how it turns out!
>
> Kev
Just out of curiosity, how would one go about creating a continuous vaccume?
A temporary one can be created inside a piston by clogging one end, but how
could one create a continuous vaccume? Would this need to be done in, say, an
accumulator (air tank)? Tha volume of a Lego accumulator is much larger than
that of a piston. Sucking the air out both sides with a several pistons at both
ends could create a temporary vaccume, but how could that vaccume be kept
continuous?
It sounds complicated to me, but Kevin Clague is constantly answering the
complicated questions!
Nathan
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Message has 2 Replies:
 | | Re: Pneumatic Questions
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| (...) The older style pumps didn't have a built in waist valve. (URL) If you connect an older pump to your compressor, then a hose from the pump to the centre port of the 2x4 "distribution block", (URL) one of the other ports (i can't remember which (...) (19 years ago, 18-Nov-05, to lugnet.technic, FTX)
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Message is in Reply To:
| | Re: Pneumatic Questions
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| (...) This is a good question. When using traditional pressure only, the force producde by the air pressure on the faces of the pistons is enough to flip a switch. Just yesterday someone asked me "If instead of using pressure, you used vaccume" (...) (19 years ago, 17-Nov-05, to lugnet.technic)
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