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[Casting] Bubbles


#1

Daniel I found that if I stored tap water in one gallon jugs, for
a week or so, before I used it to invest, that it greatly reduced
bubbles in the investment. I keep about tne one gallon old milk
jugs full and rotate them as I use them. My theory was that if it
was good for my aquarium it might work for investing. Have you
had any similar experiences with the kind of water?

I quit using debublerizer also and love R&R, but can not get it
locally so I use Satin Cast 20. Do lyou have a source for R&R
that would ship 100 pounds?

Thanks!
Don Norris
@Donald_Norris
PO Box 2433 Estes Park, CO 80517


#2

Hi Don, I get my R&R Investment from Gesswein. I haven’t used
Debubblizer in a while… however… we have gotten batches of
kerr and RR that has given us some bubble problems and In some
cases , we had to invest at water temps of 100 oF… boils like
crazy … and cuts 2 minutes off your cycle time… but it works
… no Bubbles.

Regards,
Daniel Grandi
Added a stonesetting section at the site and will have a bit more soon.
http://racecarjewelry.com/page03.html


#3

Why does raising the water’s temp. eliminate bubbles? Do you
know? I understand the shortened time frame.

Lorri


#4

Don R&R Ultravest is also my favorite investment. I don’t use a
debubblizer with it either. I used to order from Rio Grande, but
since I live in Florida the shipping was slow and expensive. I
called R&R and asked about a more local distributor and they told
me of several in Florida. Now I order one day and get the
investment the next, with less shipping cost too. I also found
that ordering two 50 lb. boxes was cheaper than one 100 lb. drum
due to the shipping cost rising at 100 lb. with UPS. R&R’s phone #
is 419/865-9497 or fax at 419/865-9997.

Rick Barnes


#5
Why does raising the water's temp. eliminate bubbles?  Do you
know?  I understand the shortened time frame.

Raising the temp, or boiling it helps to remove the suspended
gas in the solution. This is what causes the bubbles to form as
the water evaporates.

     Respectfully,

     Richard

#6
    Why does raising the water's temp. eliminate bubbles?  Do
you know?  I understand the shortened time frame. 

Hi Lorri, When you increase the water temperature of your
investment mix, It basicaly allows the water to boil at a lower
vaccum level… ie , instead of boiling at 28-29", It will boil at
26"to 27" mercury… in many cases, I have seen pumps that are
not working as well as they should, accomplish the investing job
bubble free at 100 oF. Sometimes it is not the fault of the pump,
but the investment itself which is faulty and by raising the
water temp… your investment will boil furiously . When you are
at higher elevations, i suggest using higher water temps than
normaly recommended . Kerr satin cast and R&R have a typical
work time (total) of around 10 1/2 minutes… with water at 100+
oF expect that the time will be reduced to 8 to 9 minutes from
start to gloss off. Daniel Grandi workshop
http://www.racecarjewelry.com/page03.html