Subject:
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Re: Pneumatic Questions
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Newsgroups:
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lugnet.technic
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Date:
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Sat, 19 Nov 2005 02:02:30 GMT
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Viewed:
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4694 times
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In lugnet.technic, Kevin L. Clague wrote:
> Hi Dr. Soh,
> Nice to hear from you.
Thanks, Kevin. Had to break-in as matters seem to be getting outta hand. It
appears we're getting a new generation of pneumatic fans. Great!
>
> I've never actually built with the original pneumatics, but my understanding
> is that the way to use switches in the old pneumatics is different than the way
> you use them with dual ported pistons.
No, you use them the same way. The pneumatic switch is basically a directional
control valve. It lets compressed air or suction in through one port and lets
compressed air or suction out through the other port (via the fourth exhaust
port).
>
> Don't you put vaccume on say the left port, pressure on the right port, and
> then feed the center port to the single port of the piston?
Yes, you do.
> If this is true, then can't you set up two of these opposite of each other,
> and hook one to each of the ports of a dual acting piston, and make it go?
No, that's where the fourth (exhaust) port comes in. Try working it out on
paper.
>
> I guess maybe with the old pneumatics, you never got a chance to "build up"
> pressure or vaccume though.
Not the issue, really.
>
> I think you might need two "one way valve" bricks, one per switch, to prevent
> the loss issue you are talking about though.
No help. The problem is at the pneumatic switch not in the air distribution
line.
If only they had brought out the fourth (exhaust) port to an external nozzle...
CSSoh
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Message is in Reply To:
 | | Re: Pneumatic Questions
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| (...) Hi Dr. Soh, Nice to hear from you. I've never actually built with the original pneumatics, but my understanding is that the way to use switches in the old pneumatics is different than the way you use them with dual ported pistons. Don't you (...) (19 years ago, 18-Nov-05, to lugnet.technic)
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