Subject:
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Re: Pneumatics problems
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 30 Dec 1999 22:43:23 GMT
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Viewed:
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470 times
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I believe I saw somewhere that the old style pumps has an external valve.
I think you may need a "non return valve" (see
http://w3.one.net/~hughesj/technica/registry/r_pneumatic.html)
-Rich
In lugnet.technic, Lawrence Wilkes writes:
> I have a 8462 tow truck and the pneumatic system functions fine.
>
> I wanted to build pneumatics into a MOC and had some various old pieces of
> pneumatics lying around that I had picked up in sales. I had never used them
> before. I did not want to take the 8462 to bits.
>
> However, they dont seem to work. The problem seems to be that the pump pumps
> with the down stroke and then sucks with the up stroke, so I dont get any
> action on the cylinder I am trying to control, except a little bit of up/down
> motion.
>
> I also noticed that the old switch/valves I have seem to release air
> momentarily around the switch when moved from neutral to either side.
>
> I tried various pumping mechanisms (using the powered compresser models on the
> web) with a large pump with spring, without spring, long stroke, short stroke,
> even tried using one of the cylinders as a pump, but to no avail.
>
> Am I missing something fundamental here, or is this just a sign of old tired
> seals in the pneumatics?
>
> regards
> lawrence
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Message has 2 Replies:
 | | Re: Pneumatics problems
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| (...) thanks for the link. I think this might help. I will try tommorrow What I thought was a pump as it only had one hole is a type one cylinder I have also been trying a type one pump proper, but that is clearly old and might be a poor seal. (...) (25 years ago, 30-Dec-99, to lugnet.technic)
| | | Re: Pneumatics problems
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| (...) till I followed your link. Any idea what the 'wiring diagram' would look like? What connects to what hole? regards lawrence (25 years ago, 30-Dec-99, to lugnet.technic)
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Message is in Reply To:
| | Pneumatics problems
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| I have a 8462 tow truck and the pneumatic system functions fine. I wanted to build pneumatics into a MOC and had some various old pieces of pneumatics lying around that I had picked up in sales. I had never used them before. I did not want to take (...) (25 years ago, 30-Dec-99, to lugnet.technic)
|
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