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First, this really belongs in lugnet.technic and lugnet.build - I think
maybe people who have built controls for pneumatics might be interested as
well.
FUT to the two aforementioned groups added - I have left the lugnet.general
newsgroup in order to help the person who started the thread to find where
it went, if you are reading/viewing from lugnet.general please find a little
time to find the correct group and respond from there, it would be
appreciated.
Second, in response to Jurgen's post, I think feedback would only solve half
of the problem. A better design, such as a back pressure limit switch would
do much more for real pneumatic control. A lot of the pressure depends on
the load of technic parts that the cylinder has to bear, therefore it is a
lot easier for a cylinder bearing a large weight to retract than it is to
extend.
I once put such a load on extending a pneumatic cylinder that the load
literally popped the hose off the connection to the pneumatic cylinder,
resulting in a sudden retraction of the partially extended cylinder.
Perhaps there should be a maximum pressure release valve integrated into a
model somewhere, so that over pressurizing does not result in a popped hose.
Other than that, I would love to see real digital control of pneumatic
elements - a la Mindstorms style. I'm not sure, though, if the air supply
tube should then be run out to where the actuator for the cylinder needs to
be, which would make a lot of models unprototypical looking, or if there
would be more benefit derived from having the electrical switches directly
integrated into the control box, and just running an air supply into it, or
having the supply directly fed from the control box itself.
--
Cheers ...
Geoffrey Hyde
"Juergen Stuber" <stuber@loria.fr> wrote in message
news:87g0g9pt50.fsf@loria.fr...
> Hi Alvin,
>
> "Alvin Telanco" <78of560001@sneakemail.com> writes:
> >
> > i have been playing with the pneumatics components from the 8462 truck • and
> > it struck me that the only control you get is digital. the pressure is
> > either on or off.
> >
> > has anyone found a way of controlling the pressure?
>
> do you mean a cylinder is always either fully contracted or
> fully extended?
>
> If you are a bit careful and don't push the lever all the way,
> you can move slowly and stop halfway, with manual control.
> I don't know if it can be automated, maybe with feedback of
> the cylinder's position.
>
> Jürgen
>
> --
> Jürgen Stuber <stuber@loria.fr>
> http://www.loria.fr/~stuber/
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