Subject:
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Re: System to allow pressure and vacuum for piston at the same time
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Newsgroups:
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lugnet.technic
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Date:
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Wed, 23 Nov 2005 00:04:37 GMT
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Viewed:
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4377 times
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In lugnet.technic, Chio Siong Soh wrote:
> In lugnet.technic, Kevin L. Clague wrote:
> > Single LEGO pneumatic switches are not capable of controlling a pneumatic
> > system that uses both pressure and vacuum to drive a given cylinder at the same
> > time. A single switch does not let you capture the exhaust inherint when a
> > piston contracts or expands.
>
> <snip>
> > By combining four switches, four T's, hoses and a tricky linkage, I've created
> > a very reliable composite switch that can contain the exhaust.
> >
> > I combined two of these composite switch/pistons to make a simple timing circuit
> > for testing.
>
> <snip>
> > I combined the pressure/vacuum pump and timer circuit like this:
>
> <snip>
> > When the pressure/vaccum pump is connected to batteries and turned on, the
> > timing circuit runs as desired.
> >
> > Hypothetically, these pistons and switches could be combined to create a an
> > engine that uses both pressure and vacuum at the same time. I'll leave that as
> > an excercise for the student.
>
> <snip>
> > Please let me know what you think.
>
> Wow! Great stuff!
Thank you.
>
> But why hypothetical? Would have loved to see the running engine and how it
> compares with the traditional ones using just compressed air, which was the
> original question.
>
> Pity the poor student :-)
Well we must agree that the switch solution is a bit gangly. I'd like to work
on a more compact solution before I bother with the engine.
When simply run on compressed air, the sequencer cycled faster than I would have
thought.
Engines are not really my thing anyway. I've made a few. I thought Andrew
might want to take a whack at it.
>
> CSSoh
Kevin
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