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Pneumatic Turnout Control ... Still Viable ?
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 Posted: Fri Nov 27th, 2020 03:55 am
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Wes Stewart
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I like the idea of pneumatic turnout control.

I have an air source, but Googling up nothing in terms of suppliers.

Is this still a viable option?

WES


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 Posted: Fri Nov 27th, 2020 04:38 am
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pipopak
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Model Railroader built a layout, the Tuxedo Junction,

with air operated switch machines in the early to mid 50's.


You may be able to find the articles in the internet.


Jose.




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 Posted: Fri Nov 27th, 2020 08:04 am
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oztrainz
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Hi Wes,

Would you like to discuss further what you have in mind and what scale?
Yes it can be done but don't expect it to be as cheap as servos and some wires. It won't be.

Years ago (mid-1960's early 1970's) my father, a mechanical and electrically qualified mining engineer, was looking at using air-powered logic underground in the local coal industry.
There were air mains underground and using air logic had none of the explosion ramifications of taking electronics underground.
The design and use of explosion-proof containment of electronics has come along way in 50 years.

The technical term was "Fluid Logic" with Corning trademarking the term "Fluidics".
You could build logic circuits like AND, OR/NOR, FLIP-FLOPS and ONE-SHOT triggers that acted like electronics but used air instead of electrical current to do the switching.
As a school kid I got to do some of the "research work" under Dad's direction in the workshop under the family home.

There were 3 main players for the bits we used back then and it looks like 2 of the 3 are still going strong with their ranges of air operated equipment.
Corning has taken their glass-enclosed wafer Fluidics technology in a different direction.


We used stuff from Parker-Hanafin

https://www.parker.com/Literature/Pneumatics%20Division%20Europe/PDE-Documents/General%20Catalogues/PDE2600PNUK_Parker_Pneumatic_Catalogue.pdf

804 page catalogue of everything you could conceivably need.


And Norgren

http://pages.norgren.com/au-new/actuator.html?vs=MDkxYzRhZTAtMjY3Zi00MzcwLWI1ODMtOGZmNTYxODRkNzNjOzsS1

Have a look at their compact cylinders.


Fluid Logic control could also work at extremely low air pressures measured in "inches of water" rather than PSI.
One trickle stone-duster operated on a simple FLIP/FLOP circuit powered by the pressure differential across an auxiliary vent fan.
It lasted several years underground with zero maintenance until it and the fan was run over by a shuttle car.

That ought to get you started.




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 Posted: Fri Nov 27th, 2020 10:29 am
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Helmut
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Industrial equipment has its price.


Maybe you can use LEGO Pneumatics

and use the available components





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 Posted: Fri Nov 27th, 2020 11:07 am
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Wes Stewart
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Found my answer:

https://www.sunsetvalleyrailroad.com/pneumatics.html

carries a full line.


WES


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 Posted: Fri Nov 27th, 2020 06:38 pm
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oztrainz
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Hi Wes

Now that was one I didn't know of.
I'm always happy to find out "new stuff".

That's a very comprehensive range of small-bore air-powered stuff,
and with the related interfacing to and from a lot of other useful stuff.

:2t:  :apl:




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