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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Tue, 22 Nov 2005 23:49:35 GMT
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Viewed:
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4250 times
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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!
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 :-)
CSSoh
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