In the process of building a cocktail robot, I found myself in need of a servo controlled valve. I played around with a simple arm linkage, but the geometry didn't work out very well. It was hard to get leverage at both end of the stroke, and I was wasting most of the servo's range of motion anyway....By: gfish
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from Instructables: exploring - technology - robots http://ift.tt/1vF8v3U
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