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(...) Gee, thanks! (...) Let me know how this works out. Strangely enough, I have never actually used the pump do do anything other than test my limit switch. Here's where I whine and complain about having a good, paying job and a house, and wife, (...) (25 years ago, 29-Sep-99, to lugnet.robotics, lugnet.build)
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Hello Ralph... I have built your original compressor from the photos you provide. I really like its form, rigidity and functionality. A great design. I plan to modify mine tonight into a full stroke design as some have suggested. All you need do is (...) (25 years ago, 29-Sep-99, to lugnet.robotics, lugnet.build)
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Why is this two stage? I could not follow this design clearly but are you feeding the output of one stage to the input of the next? Two compressor pistons in parallel is something else (double acting?? I am not sure what)... Cool design no mater (...) (25 years ago, 29-Sep-99, to lugnet.robotics, lugnet.build, lugnet.robotics.rcx)
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(...) Hi Chio Thats a pretty interesting design. Nice work! (URL) Here is a link to some pictures of the two stage compressor I built. Hopefully there are enough details shown to reconstruct it but if you have any questions let me know. The actual (...) (25 years ago, 29-Sep-99, to lugnet.robotics, lugnet.build, lugnet.robotics.rcx)
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c s soh <cssoh@singnet.com.sg> wrote in message news:37F21B8E.1C3CD6....com.sg... (...) What kind of maximum pressure (psi) can you get? I built a pressure sensor that I will publish very soon based on the Lucas sensors available from Digikey. I (...) (25 years ago, 29-Sep-99, to lugnet.robotics, lugnet.build, lugnet.robotics.rcx)
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The page on compressor comparisons is really informative. I'm honoured that you felt my design was worthy of testing. The reason I made it a two stroker was to "balance" the load on the driving system. Michael Powell's compressor tends to "lump" (...) (25 years ago, 29-Sep-99, to lugnet.robotics, lugnet.build, lugnet.robotics.rcx)
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(...) Thanks, It could possibly be done but I've not tried it. It would have made the air compressor tester more complicated than necessary. As you can see I'm really a minimalist. One of the design goals was to keep it simple yet fully functional. (...) (25 years ago, 29-Sep-99, to lugnet.robotics, lugnet.build, lugnet.robotics.rcx)
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(...) <snipsnip> (...) <snipsnip> (...) That seems easily solved with some extra gears, or am I missing something? I mean, you could amplify the rotation of the axle by five (or three, or two) any number of times until the rotation sensor does pick (...) (25 years ago, 29-Sep-99, to lugnet.robotics, lugnet.build, lugnet.robotics.rcx)
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| | lego mech added to my space team
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I finally found time to share my battle mech design that I had built about a 3 months ago. Although I have not made a dat file of it yet, it can be viewed at my site (URL) It's basically built around the minifig and most of the pieces came out of (...) (25 years ago, 29-Sep-99, to lugnet.build)
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(...) The 8250 Rescue Sub is indeed a great way to start a pneumatics collection. Then just purchase more tubing, valves, and cylinders from S@H or Dacta. The Front End Loaded is a more expensive set with three large cylinders, two valves, a tank, (...) (25 years ago, 28-Sep-99, to lugnet.robotics, lugnet.build)
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For what its worth, the Lego Shop@Home catalog is offering the #8250 Rescue Sub for $25.00, discounted from $49.50. Big pump, air tank, one valve, one big cylinder, long yellow beams and nifty molded shapes. For the price, I'm thinking of getting (...) (25 years ago, 28-Sep-99, to lugnet.robotics, lugnet.build, lugnet.robotics.rcx)
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(...) I have tried to emphasise all the time in my web pages. It has probably reached the theoretical limit of efficiency for the small pump. It will be difficult to build another compressor that can surpass his mini compressor. On the other hand, (...) (25 years ago, 28-Sep-99, to lugnet.robotics, lugnet.build, lugnet.robotics.rcx)
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(...) Thanks, Indeed, my first attempt was to use a rotational sensor positioned with the axle at the pivot point of the lever arm and tried to datalog the angular movement using DACTA Control Lab. However, the resolution of the rotation sensor (...) (25 years ago, 28-Sep-99, to lugnet.robotics, lugnet.build, lugnet.robotics.rcx)
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A Lego testing machine for Lego compressors... wow, one of the coolest Lego things ever seen around! I love the idea and love your implementation, and find your results very useful. BTW, I think that the Ralph Hempel's double-action compressor (...) (25 years ago, 28-Sep-99, to lugnet.robotics, lugnet.build, lugnet.robotics.rcx)
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Nice work! For a while it looks that you could travel back in time using this recording device, before you realize that the pen draws an arc when the paper doesn't move ;-). Could it be possible to add a rotational sensor and datalog the time and (...) (25 years ago, 28-Sep-99, to lugnet.robotics, lugnet.build, lugnet.robotics.rcx)
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(...) Thanks for the nice comments and suggestions. As a matter of fact, I'm working towards a doctorate in Legorobotology, majoring in Pneumatics (what else) from the University of Legoland, if not MIT :-)) -- C S Soh (URL) where air is power (25 years ago, 28-Sep-99, to lugnet.robotics, lugnet.build, lugnet.robotics.rcx, lugnet.technic)
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(...) Er, <wipes egg off face> never mind. They're on the next page. Missed that the first time. However the Limit switch reference probably should be changed. I merely hosted the diagram that I was mailed, and I cannot take credit for coming up (...) (25 years ago, 28-Sep-99, to lugnet.robotics, lugnet.build, lugnet.robotics.rcx, lugnet.technic)
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Wow. Did you do that for a paper or thesis? Very worthy research with a surprising outcome. I am sure most of us would surmise that the big sprung cylinder would give more efficacious designs because the displacement would be larger. This site (...) (25 years ago, 28-Sep-99, to lugnet.robotics, lugnet.build, lugnet.robotics.rcx, lugnet.technic)
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(...) Thanks, The Advanced Pneumatics Set is Lego DACTA #9633. It's a great set to start pneumatics although its considered a bit expensive. It's pictured at my page on: (URL) S Soh (URL) where air is power (25 years ago, 28-Sep-99, to lugnet.robotics, lugnet.build, lugnet.robotics.rcx)
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Thanks for the great comparison between compressors! I have been wondering which one was actually the best. Now to make a better one! One question though, what is the set number for the Advanced Pneumatics Set? Great Work! John Matthews C S Soh (...) (25 years ago, 28-Sep-99, to lugnet.robotics, lugnet.build, lugnet.robotics.rcx)
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