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In lugnet.robotics, Soh Chio Siong writes:
> Ross Crawford wrote:
> >
> > In lugnet.robotics, Jennifer Clark writes:
> >
> > > Very interesting, I am looking forward to seeing some more of this home • made
> > > stuff. You say it is not possible to use an air tank in the old style
> > > circuit, but would it work with two air tanks, one on the high pressure • hose
> > > and the other on the vaccuum hose, between the pneumatic "diode" and valve?
> >
> > Difficult to regulate though - as the same pump affects both. When the high
> > pressure one is full & low pressure one needs pumping, it'll keep adding
> > pressure to both (one outside, one inside). You'd have to have some kind of
> > pressure release valve in both lines.
>
>
> Alas it doesn't work that way at all. The air tanks will definitely not
> work with the old style pneumatics whatever way you try to incorporate
> them in (yep, I spent a good hour checking).
>
> Now as I understand it, the air tank is meant to store compressed air
> which can then be later released as required so that one doesn't have to
> keep on working the hand pump. This is fine for the new (double-acting)
> cylinders which needs compressed air on both the outward and the return
> stroke.
>
> On the other hand, the old single-acting cylinders, require compressed
> air for the outward stroke but a suction *not low pressure* for the
> return stroke.
>
> Ok, you can store compressed air and release it as you like. But how do
> you actually store a suction force (?vacuum) and release(?) it whenever
> you like?
You store it the same way. A tank can store a vacuum as well as pressure - it's
basically equivalent to increasing the pressure outside. This principal was
used on many steam trains (and some diesels?), which use vacuum brakes. There's
a description here http://www.trainweb.org/railwaytechnical/vacuum.htm
In the case of the technic pnuematics, it would be released by switching the
control switch to the appropriate side. With the switch either on the other
side, or in the centre, the vacuum would be held in the tank.
That's why you'd need 2 tanks - 1 on the high pressure line, and 1 on the
vacuum line.
ROSCO
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Message is in Reply To:
 | | Re: Home-made One-way valve
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| (...) Alas it doesn't work that way at all. The air tanks will definitely not work with the old style pneumatics whatever way you try to incorporate them in (yep, I spent a good hour checking). Now as I understand it, the air tank is meant to store (...) (23 years ago, 18-Dec-01, to lugnet.robotics, lugnet.technic, lugnet.build)
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