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Showing results for tags 'remote controlled pneumatic'.
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Small Autovalve
Tamas Juhasz posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hi! Some days ago, I created this autovalve: http://www.brickshelf.com/cgi-bin/gallery.cgi?f=534632 My goal was to keep it small and reliable. If there is something, which can be build in a lot of variation, that's the autovalve. (If you don't know what it is: autovalves are made to remote control the pneumatic valves, the motor switches also the valve during making pressure with the compressor. The valve's position depends on the motor's turning direction) I needed as small autovalve as possible, and I also wanted to make something own. This one never can get stuck, I think this is the most important. Some other ones, I tried out, sometimes get stuck when I wanted to start them again or when they reached a special position. For working properly, it requires strong black pins ( http://www.brickshelf.com/cgi-bin/gallery.cgi?i=5955002 ; or the very old ones in 8842) if the valve is new, and hard to move it's lever. The pictures tell the working principle, I tried to make it very simple. The worm gear moves the 8t gear which is built together with the valve lever. The worm gear "ends", when the lever reaches one of the two final positions. The other 8t gear with the blue pin is for going backwards. Sometimes it doesn't needed, but without that it wouldn't be 100% reliable. There is a difference also between the blue pins, so if you choose well, it requires absolutely minimum power to turn. A little video: