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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?
>
> Gosh, this is getting kinda involved. Any good physicists around to bail
> us out?
you can store the vacuum in the LEGO tank or any other tank for that matter,
but the technic pumps will not work for this unless you do a bit of work to
figure this out: if you hook an old style pump straight to a valve (dont
know which pin but i think it is the center) and then flip the valve one way
so that whenyuo pull up on the pump it will suck the air out of the tank
(yea I know it's a run-on sentance) then flip the valve so the air blowing
in goes out the unused pin! in this way you can suck all the air out of the
tank you want, although it would probably be better to use a non-LEGO pump
that has just suction.
Did anyone get that?
cuz' I bareley did :)
Jared
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Message has 2 Replies:
 | | Re: Home-made One-way valve
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| (...) ...the whole concept of "storing vacuum" is a little disturbing. :-) Perhaps "lowering the air pressure" in the tank would be a little more reasonable! ---...--- Steve Baker ---...--- Mail : <sjbaker1@airmail.net> WorkMail: <sjbaker@link.com> (...) (23 years ago, 18-Dec-01, to lugnet.robotics)
| | | Re: Home-made One-way valve
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| Instead of pushing a pneumatic switch back and forth, you can use the old non-return valve: (URL) the pump to the middle hole, connect the air tank to the left hole and leave the right hole free. The old style pump will pull air out of the tank and (...) (23 years ago, 18-Dec-01, to lugnet.robotics, lugnet.technic, lugnet.build)
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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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