Subject:
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Re: Pneumatics Vs. Hydraulics
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 27 Jul 2004 14:58:04 GMT
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Original-From:
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Bruce Boyes <(bboyes@systronix.)StopSpam(com)>
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Viewed:
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1300 times
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Quoting Iain Hendry <militaryduckjock@rogers.com>:
> "Andrew G. Meyer" <agmlego@yahoo.com> wrote:
>
> > Hi, I'm wondering if there is any true difference between Lego
> pneumatics
> and
> > hydraulics. I own a good-sized collection of pneumatics, and am looking • at
> > purchasing a recent model that claims to have hydralics to move an arm
> on
> it.
>
> It's pneumatic. In real life it'd be hydraulic, so they just used that
> word.
Searching on the web, found:
Hydraulic: moved or operated or effected by liquid (water or oil);
"hydraulic erosion"; "hydraulic brakes"
Pneumatic: Consisting of, or resembling, air; having the properties of an
elastic fluid; gaseous; opposed to dense or solid.
AFAIK all Lego has ever had are pneumatics which are models of what would be
hydraulics on the real machines.
Does anyone make scale models which use real hydraulics (water or mineral
oil maybe?). I guess water or oil leaks would be a lot messier than air
leaks and the pressures might be higher too, preventing use of
push-together plastic hoses.
A bit of googling seems to indicate "no", but there are some people with way
too much spare time:
http://www.trainclub.com/cgi-bin/frameit.cgi?url=http://www.ameritech.net/users/techjoc/BigModelTrains.htm
http://www.thebigroad.com/grand.htm
Bruce
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Message has 1 Reply:
 | | Re: Pneumatics Vs. Hydraulics
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| (...) I wonder whether the viscosity of fluids scale reasonably? It's easy to imagine that the losses involved in forcing hydraulic oil through a tube with only one or two millimeter cross-sections would be huge compared to the real-world device. I (...) (20 years ago, 28-Jul-04, to lugnet.robotics)
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