 | | Re: Home-made One-way valve
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Instead of pushing a pneumatic switch back and forth, you can use the old non-return valve: (URL) the pump to the middle hole, connect the air tank to the left hole and leave the right hole free. The old style pump will pull air out of the tank and (...) (23 years ago, 18-Dec-01, to lugnet.robotics, lugnet.technic, lugnet.build)
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| | Re: Home-made One-way valve
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Alternativeley you can continue using the valve with the old style pump and have an air tank (if you own two) on each side i.e. one that holds the vaccum and one that holds the pressureized air. but... theres still the problem of flipping the valve (...) (23 years ago, 19-Dec-01, to lugnet.robotics, lugnet.technic, lugnet.build)
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| | Re: Home-made One-way valve
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(...) Somehow I'm a bit queasy about this business of "storing vacuum" in a tank. So I checked with the local supplier of industrial gases. If you need a tank of compressed air, that's no problem. But a tankful of vacuum, er that's not listed in the (...) (23 years ago, 20-Dec-01, to lugnet.robotics, lugnet.technic, lugnet.build)
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| | Re: Home-made One-way valve
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(...) I think the reason for that is simply that you can't store very much "vacuum" in a tank. While you can pressurize a tank to several hundred PSI or better, for vacuum you're limited to completely (well, OK, nearly completely) evacuating it--a (...) (23 years ago, 20-Dec-01, to lugnet.robotics)
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| | Re: Home-made One-way valve
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c s soh <cssoh@singnet.com.sg> wrote in message news:3C213F4F.CC899E....com.sg... (...) and (...) How about a vacuum flask (thermos), domestic lightbulb, or even CRT (cathode ray tube such) as in your TV or monitor. These all rely on a stored (...) (23 years ago, 20-Dec-01, to lugnet.robotics, lugnet.technic, lugnet.build)
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| | Re: Home-made One-way valve
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(...) Argh! <rant> It's been a long time since domestic lightbulbs were even partially evacuated - these days they are filled with some kind of relatively inert gas. Back in the 1940's and 50's they were partially evacuated - and on some old movies (...) (23 years ago, 20-Dec-01, to lugnet.robotics)
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| | Re: Home-made One-way valve
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In lugnet.robotics, sjbaker1@airmail.net writes: [snipped rant about light-bulbs] (...) Well, since a perfect vacuum has never (AFAIK) been shown to exist anyware (even in space), I guess you're right. However a partial vacuum is easy to "store" and (...) (23 years ago, 20-Dec-01, to lugnet.robotics)
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| | Re: Home-made One-way valve
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(...) a (...) tanks (...) own (...) So, define vacuum as an area of lower pressure than the surrounding environment. I think that satisfies most if not all of your requirements, and is what most people seem to think of when they mention vacuum. Andy (23 years ago, 20-Dec-01, to lugnet.robotics)
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| | Re: Home-made One-way valve
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(...) If you had a 1 atmosphere vacuum in a blue LEGO tank and you took it to the bottom of the Mariana Trench you would have about 13,000 atmospheres of vacuum in it. And if you took it out into space you would have *no* atmospheres in it. All this (...) (23 years ago, 20-Dec-01, to lugnet.robotics)
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| | Re: Home-made One-way valve
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(...) So you are happy to say that you can increase the amount of vacuum in a sealed tank by placing it at the bottom of a bucket of water? Mmm'K. ---...--- Steve Baker ---...--- Mail : <sjbaker1@airmail.net> WorkMail: <sjbaker@link.com> URLs : (8 (...) (23 years ago, 20-Dec-01, to lugnet.robotics)
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| | Re: Home-made One-way valve
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If the surrounding environment is the same as what should be in the tank if not for the vacuum - since all are partial anyway - the the vacuum doesn't increase. The matter has to be the same. Andy ----- Original Message ----- From: "Steve Baker" (...) (23 years ago, 21-Dec-01, to lugnet.robotics)
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| | Re: motorized pnuematic valve
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Hi, this is my first post on a LEGO newsgroup, so.. ah... I'm a newbie I guess :) (...) (URL) (file size ~ 2 mb) That was my biggest obstacle making this little motorized pump. The parts used to connect the motor to the valve are kind of (...) (23 years ago, 3-Jan-02, to lugnet.robotics, lugnet.technic, lugnet.build)
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| | Re: motorized pnuematic valve
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Sounds interesting, but the link didn't work for me : ( (23 years ago, 5-Jan-02, to lugnet.robotics, lugnet.technic, lugnet.build)
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