Subject:
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Re: Old pneumatic pistons
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Newsgroups:
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lugnet.technic
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Date:
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Wed, 15 Nov 2000 02:14:38 GMT
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Viewed:
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1113 times
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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 outputs of the bricks, together, to your air tank (or
whatever). The advantage over using 2 single-acting cylinders is the space
required. More space is required for the blocks, but these are easier to
place, and don't have to be near the cylinder.
Regards,
ROSCO
Tobbe Arnesson <tnt@arnesson.nu> wrote in message
news:3a111746.606623258@lugnet.com...
> > 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...
>
> 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 to be pressing the
> piston up but this works rather bad so one has to pull the piston by
> hand.
>
> The suction/preassure is led to the direction valve via one hoose. The
> valve looks like a grey 2x4 brick with three connections to the side
> of it. The middle connection is used to the pump and the two outer is
> connected to the valves outer connections. Then the middle connector
> of the valve is connected to the pneumatics connector.
>
> Thus will there be one "system" with preassure and one with suction
> all the way to the valve. The valve is identic to the once used today.
>
> When the valve is flipped from one side to the other both the hoose
> and the cylinder must be filled with either preassure or suction,
> hence is the "reaction" of the old system poor. Another disadvantage
> is when several valves is connected to one system using T-crosses,
> like in the 8851 Excavator the valves cannot be crossed (one valve to
> suction and one to pressure) because all the air will escape from the
> system when this is happens.
>
> One good thing is that only one hoose has to be led from the valve to
> the cylinder, but I prefer the new-style pneumatics.
>
> Hope this helps. If you want me to I can set up a page with schematics
> of the two systems.
>
> /Tobbe
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Message is in Reply To:
 | | 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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