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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?
--
C S Soh
CSSoh's Lego Pneumatics
http://www.geocities.com/cssoh1
... where air is power!
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Message has 2 Replies:
 | | Re: Home-made One-way valve
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| (...) 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 (...) (23 years ago, 18-Dec-01, to lugnet.robotics, lugnet.technic, lugnet.build)
| | | Re: Home-made One-way valve
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| (...) made (...) hose (...) 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 (...) (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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| (...) 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 (...) (23 years ago, 17-Dec-01, to lugnet.robotics, lugnet.technic, lugnet.build)
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