 | | Old pneumatic pistons
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Hi, can anybody comment on the old pneumatic pistons, those in e.g. 8851? They seem to have only one connector, so it seems that you can only push them out, not retract them like the new ones in e.g. 8462. Or is there some spring inside to contract (...) (24 years ago, 9-Nov-00, to lugnet.technic)
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| | Re: Old pneumatic pistons
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(...) I don't know about the old piston but regarding the small one, there is one in 8042 and 8443. (24 years ago, 9-Nov-00, to lugnet.technic)
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| | Re: Old pneumatic pistons
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"Juergen Stuber" <stuber@loria.fr> wrote in message news:87ofzpz08v.fsf@loria.fr... (...) They worked like this, when you pumped they get ait pushed in to them or sucked out of them. /Martin (24 years ago, 9-Nov-00, to lugnet.technic)
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| | Re: Old pneumatic pistons
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The old pneumatics worker slightly differently. Connections went like this: Hand pump connected to direction valve conn. to switch valve conn. to cylinder The direction valve split the pressure created during a compression stroke from the suction (...) (24 years ago, 9-Nov-00, to lugnet.technic)
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| | Re: Old pneumatic pistons
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(...) As a side note: that direction valve doesn't function very good if you fill up your *pneumatic* system with water (hydraulic)... case and point, mine's bust due to an ill-formed stroke of genius at age 10... C. (24 years ago, 12-Nov-00, to lugnet.technic)
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| | Re: Old pneumatic pistons
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(...) I broke one direction valve while playing with the 8843 Fork Lift Truck. To further explain how the old-style pneumatics work: The handpump creates air preassure when pressed down and suction when pressed up. The spring on the pump is supposed (...) (24 years ago, 14-Nov-00, to lugnet.technic)
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| | Re: Old pneumatic pistons
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One thing I found with the old-style pneumatics, particularly the excavator, was that the down stroke was considerably easier, in fact, one had to pump very carefully if one only wanted a minor adjustment, otherwise the pressure of the entire (...) (24 years ago, 14-Nov-00, to lugnet.technic)
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| | Re: Old pneumatic pistons
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One very useful application for the old-style pneumatics I've thought of is a single-cylinder, double-acting compressor. Using a new double-acting cylinder, connect each hose to the centre input of an old-style pneumatic brick, and connect the (...) (24 years ago, 15-Nov-00, to lugnet.technic)
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