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(...) An interesting thing has happened. after asking about how one sets up the switches to access the fourth port, I decided to sit down and figure out how to do it myself. Initial progress was slow and I don't have any pictures of it, however, I (...) (19 years ago, 21-Nov-05, to lugnet.technic)
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| | Re: Pneumatic Questions
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(...) Been done here: ((URL) look like it's gonna be easy to modify. (...) Wish they would! BTW, I made a bummer in calling the hidden exhaust port the 'fourth port'. It should actually be port 3. In pneumatics nomenclature, the ports are designated (...) (19 years ago, 21-Nov-05, to lugnet.technic)
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| | Re: Pneumatic Questions
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(...) Great! Let's see how the engine runs. CSSoh (19 years ago, 21-Nov-05, to lugnet.technic, FTX)
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| | Re: Pneumatic Questions
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"Kevin L. Clague" <kevin_clague@yahoo.com> wrote in message news:Iq9H1s.2Ao@lugnet.com... (...) Has anyone tried to open up the pneumatic switch (old and new ones) to see if there is a way this 4th port could be vented into a tube and thus (...) (19 years ago, 21-Nov-05, to lugnet.technic)
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| | Re: Pneumatic Questions
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(...) Hi Andrew, Here is a schematic for an engine that combines pressure and vaccume on both piston faces. (URL) uses the four port switch I described in this thread: (URL) The image shows a compressor and air tanks for having pressure and vaccume (...) (19 years ago, 20-Nov-05, to lugnet.technic, FTX)
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| | Re: Pneumatic Questions
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(...) I found this picture on my brickshelf account. It shows the lego geometry needed to implement the four port switch. The hoses are not right, but the switch positions and lever linkages are correct. (URL) (19 years ago, 20-Nov-05, to lugnet.technic)
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(...) I'm not at home, so I can't lookup the history on this in my LEGO notebooks. I think Doug Carlson invented this. I rederived it today, because I knew it wasn't too complicated. It involves four switches and four T's. The four switches form two (...) (19 years ago, 20-Nov-05, to lugnet.technic)
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| | Re: Pneumatic Questions
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(...) Hi Billy, A LEGO pneumatic switch has four ports. You are probably familiar with the obvious three: left, center and right. The fourth port is not obvious. When you've got pressure on one port of the piston, and you switch the switch so you (...) (19 years ago, 20-Nov-05, to lugnet.technic, FTX)
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| | Re: Random Pneumatic idea/question
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(...) Is it now? Hmmmmmm. How would one go about hooking these switches to access the fourth port? Is there a website that I can visit that would give a good explanation to this? With thanks, Billy. (19 years ago, 20-Nov-05, to lugnet.technic)
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(...) I know this sounds a little naive, but what is a release-free switch, and what would it be used for? Billy. (19 years ago, 20-Nov-05, to lugnet.technic, FTX)
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(...) Ahhh, I would love to see it done :-) CS (19 years ago, 20-Nov-05, to lugnet.technic, FTX)
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| | Re: Random Pneumatic idea/question
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(...) Yes, the fourth port is an issue. It is possible to hook multiple switches to give you access to the fourth port though. (...) Kevin (19 years ago, 20-Nov-05, to lugnet.technic)
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| | Re: Other pneumatic questions.
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(...) That makes sense. I guess that over a long circuit the air in the system would loose its... uh... effectiveness at accurately sending and recieving the information from the RAM device, (I guess thats how you would say it.) and that a purely (...) (19 years ago, 19-Nov-05, to lugnet.technic)
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(...) Speaking of liquids, Is it possible to replace the air in the pneumatic system to make a hydraulic system. I mean by using something like, oh say, 10 WT silicone oil? (URL) I guess not since you can't complete the circuit because of the (...) (19 years ago, 19-Nov-05, to lugnet.technic)
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(...) Hi Nathan, It is possible to make a sprayer using pneumatics. Imagine how a super soaker works. You have a water tank, and an air pressure tank. You pump up pressure in the air pressure tank. Once you release that pressure, the water is (...) (19 years ago, 19-Nov-05, to lugnet.technic)
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(...) Billy, I'm pretty sure you could, but I doubt you'd want to use a piston per bit of memory. (...) Instead you might want to use a 1x10 technic brick, with long pins with friction in them. The idea being that you can slide the pins in the (...) (19 years ago, 19-Nov-05, to lugnet.technic)
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| | Re: Crazy building moment?
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Hi Like Tommy Eriksson I have also decided to post a reply to this old thread. I am in the process of trying to make LEGO fly but unlike Tommy, I am going for a small light powered glider that is catapulted from a Technic "ballista-like" affair that (...) (19 years ago, 19-Nov-05, to lugnet.technic, FTX)
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| | Random Pneumatic idea/question
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You guys are smart. I get lost reading your posts but can appreciate the genius displayed in them. Could pneumatics be used to pump a liquid? I mean, you know how air pressure is used in spray bottles/soap dispensors? The moving air goes over a gap (...) (19 years ago, 19-Nov-05, to lugnet.technic)
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Hi all. I'm sorta new here so, I'm not real familiar with way the forums work. Anyhow, having seen the three position piston control by Kevin L. Clague, and other various pneumatic logic devices using Boolean logic and Boolean gates, I was (...) (19 years ago, 19-Nov-05, to lugnet.technic)
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| | Re: Pneumatic Questions
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(...) Just so. (...) No, it wouldn't walk backwards. To make it work, you'd only have to interchange the hoses at the switches. That's because a suction force acts in the opposite direction to the traditional compressed air. Your walker will then (...) (19 years ago, 19-Nov-05, to lugnet.technic, FTX)
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