Allan Adler wrote in
:


One can regard the needle of a syringe as a very thin pipe, but it is
also a very short pipe. Syringes are used in microscale organic
chemistry labs to transfer small quantities of fluids. If one wanted
to avoid syringes and instead transfer the same quantities of liquids
along a pipe from a small tank of the liquid, I imagine one would need
a pipe as thin as a syringe needle. At any rate, one can choose to do
so at the design level. (I realize there might be more resistance
along the pipe and considerable difficulty clearing a blocked pipe and
possible problems due to sagging of the pipe, but never mind.)

I have no laboratory and no shop and have no plans to actually do any
of this. I'm just thinking about how it might be done. Since the
solution involves a problem in metal work, I think it is appropriate
to ask about it here.

The questions a
(1) How would one make a long metal pipe (e.g. a few feet) which is as
thin
and as hollow as a syringe needle?
(2) And what if one wanted the pipe to follow some path other than
straight?
Probably it is too thin to bend without closing it off, no matter
how carefully one tries to do it. Maybe one has to make miniature
versions of all of the standard plumbing fixtures and, to make
sure the connections are strong enough, one allows the outer
diameters of the pipes to increase where the threads are. So that
feature of the pipe design would also have to be included.

Ignorantly,
Allan Adler


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Would it not be the same to use a larger, more easily manufacturable pipe
(read cost) for most of the conduit with only a metering section near the
end? What process would require this small of a conduit for any
appreciable length? The mechanical properties of this type of conduit
would be terrible, subseptable to any vibration, mechanical distortion
and temperature gradients.


--
Anthony

You can't 'idiot proof' anything....every time you try, they just make
better idiots.

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