Paul on wed 3 sep 03
Hello,
there were some recent posts about using air-operated diaphragm pumps for
slip casting, and ever since then i have noticed quite a few of these things
around at the scrapyards. From what i have heard, they are not that hard to
rebuild so one could buy a used one cheap and if it goes out, the diaphragm
could be replaced. Anyway, the other day i found a smaller one, about 1/2"
at the scrap yard that looked to be in good shape. Too small for slip but i
was wondering if anyone has used something like this in conjuction with a
spray gun for glazing? I would think that if someone had this, with a
pressurized cannister and the right spray gun they could have a good hvlp
system. I could probably have bought that pump for $5 but decided to wait
until i hear from someone else who has done the same thing before i try to
set all this up. Anyone have any experience with this? thanks,
Paul B
Falmouth,Ky
WHC228@AOL.COM on wed 3 sep 03
Paul
I use a diaphragm pump to supply my spray guns. I collect the glaze from the
bottom of the glaze container, and return it to the bottom of the container
also. I put a "T" in the line that goes to the spray gun. The air can be
adjusted to set the pressure in the fluid line. The glaze is kept in motion so that
it helps to keep it stirred.
Buy the pump if you can get it that cheap.
Bill Campbell
George Koller on wed 3 sep 03
>........was wondering if anyone has used something like this in conjuction
with a
> spray gun for glazing?
Paul,
Can't be certain what kind of volumes you are talking about here but per my
humble
experiences diaphram pumps (for air) are relatively low volume. Used many
of them
for fish tanks but you might be talking about something different.
Here is a rig that I think might be interesting for you, especially if you
have or can get
a nice cannister vacuum system on the cheap....
Harbor freight has a HVLP gun (a good looking gravity feed unit = better per
my
experience) for all of $11.99. It is there part# 47482-0CSA. This gun has
a 1 7/32"
ID designed to work with a "standard blower enabled shop vac" type vacuum.
Even buying the shop-vac would be a sweet deal if you consider you are
getting a
HVLP system for less than $100 total AND a shop vacuum for free?
Have not used this particular unit, but have used the shopvacs - they are
noisy. The
whole "cheapo HVLP" thing is a pile of pluses and minuses where I think the
pluses
come out good for glazes but this is also an area where people have plenty
of room
to have their own opinions.
Hope this helps,
george koller
sturgeon bay, wi - door county
northport, mi - leelanau county
two great places separated by 100 miles of great lake.
Mark Ascended on thu 4 sep 03
Hey Paul.
Name's Owen. Since you asked about pumps here's what I know. I worked with
them for a year at a large production studio. There were over a dozen of
them in various parts of the studio pumping slurry, slip, glaze, water, and
sludge. I was mixing the glazes and slip there so that's what I came in
contact with most commonly.
The pumps work great. DIaphragm pumps keep a even flow and a lot of force.
You do have to tolerate a *lot* of noise, and the vibration from them is
quite considerable. on more than one occasion they've vibrated off their
attaching pipes, or worked pipes out of wall restraints or through
sheetrock.Glaze and slip do begin to wear down the pieces inside the pump if
yyou are running them non-stop. glaze materials are quite abrasive in pump
components.
If you are working with large quantities of glaze (600 lbs+/100 gall+) then
these pumps are great.
If you have smaller amounts I really recomend paint canisters. Really.
These things worke awesome. Find a few pressurized paint or fertilizer
canisters, rig up an auto spray gun, and fill it with a platic wastebasket
of glaze, and you have an interchangable, fast, and easy system of glazing
that can hold half a spackle bucket at a time.
hope this helps.
Owen
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Earl Krueger on thu 4 sep 03
For certain purposes you can't beat a peristaltic pump. You can
control flow rate from drop-at-a-time to high volume. Since the only
part that comes into contact with the liquid is the tubing they are
easy to clean and repair and do not contaminate.
For those who may not know, a peristaltic pump works like your gut. It
is basically a motor with a wheel attached to the shaft. On the
outside of the wheel are multiple rollers. A piece of flexible tubing
is bent around the wheel in a U shape and squeezed against the rollers.
As the wheel turns the rollers squeeze the tubing pushing the liquid
through. Usually there is some kind of speed control for the motor.
A web search for "peristaltic pump" will give you lots to look at.
Earl...
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