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Re: vacuum pump
Tesla List wrote:
> I need to vacuum it out.
> I was wondering if a vacuum pump intended for auto repair would work for
> this purpose.
If you like to build things, I once made a vacuum pump that could
not be simpler. I cut a plastic pen in two, so I had two tubes, one
ending in a point with a small hole. The internal space of that pen
was just enough for the paint charge. One end of the other half I
shaped as a funnel. I then mounted the two tubes with the point
close to the funnel inside a section of a larger tube (1"),
with both ends closed by plastic disks. At one end, I fixed an
additional pen tube to be used as output connection through another
hole in a disk. All the joints were firmly glued, air tight.
+---------+
| |
water in ====|===> >===|===== water out
| ==== vacuum
+---------+
With water from a reasonably high pressure source flowing
(a few meters drop), the vacuum goes easily to the boiling point of
water, about 0.5 cm Hg.
Antonio Carlos M. de Queiroz