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(...) Actually, I've been thinking about this for awhile, and I think there's an "easy" way to switch pneumatics under motor control. The rubber air hoses can be pinched shut with a reasonably small amount of force. It seems to me that you could use (...) (25 years ago, 29-Sep-99, to lugnet.robotics, lugnet.build)
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| | Re: Does anyone have the 8479 bar code truck?
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(...) The clutch gear is the same basic size as a normal 24-tooth gear, but the center (where the axle passes through) can spin freely if there is too much force holding the gear in place. I believe the gear says right on it that it will stall (...) (25 years ago, 29-Sep-99, to lugnet.build)
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| | Re: Does anyone have the 8479 bar code truck?
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(...) I have not seen what this clutch gear can do. Does anyone care to describe what makes it great to have? It has 24 teeth just like other gears, but what does the "clutch" part mean (apart from what a clutch means like in a car). Also, how are (...) (25 years ago, 29-Sep-99, to lugnet.build)
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| | Compressors, Valves, and Other Wishes
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(...) Yes, this is still a difficult problem. The best solution I've seen is Linc's micro motor controlled valve at: Hmm, it seems to have moved again... now at: (URL) have built this valve control, but find the action between the gear and worm gear (...) (25 years ago, 29-Sep-99, to lugnet.robotics, lugnet.build)
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| | RE: RCX Controlled Air Compressor Tester
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I don't have the parts, or I'd try it myself.... But can a full radial engine design (say 5 pumps) compressor be far behind? It begs the question: What are we going to do with this great volume of compressed air.... Jet robots? ;>) Jeff (...) (25 years ago, 29-Sep-99, to lugnet.robotics, lugnet.build)
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| | RE: RCX Controlled Air Compressor Tester
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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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| | Re: RCX Controlled Air Compressor Tester
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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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| | Re: RCX Controlled Air Compressor Tester
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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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| | Re: RCX Controlled Air Compressor Tester
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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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| | Re: RCX Controlled Air Compressor Tester
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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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| | RE: RCX Controlled Air Compressor Tester
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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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| | Re: RCX Controlled Air Compressor Tester
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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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| | Re: RCX Controlled Air Compressor Tester
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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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| | Re: RCX Controlled Air Compressor Tester
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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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| | RE: RCX Controlled Air Compressor Tester
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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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| | Re: RCX Controlled Air Compressor Tester
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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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| | Re: RCX Controlled Air Compressor Tester
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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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| | Re: RCX Controlled Air Compressor Tester
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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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| | Re: RCX Controlled Air Compressor Tester
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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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