06-23-2008, 05:42 PM
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Deity
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Join Date: Jul 2004
Location: Saint Regis Falls, NY, USA.
Posts: 3,883
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I'll put together a rudimentary diagram with microsoft "paint" and post it. the bimba cylinder can work with hydraulics or air. I was thinking using air, because the force needed by the counterweight to retract the door under no power conditions would be the weight of the door plus the air exhausting out of the cylinder.
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