Jewelry Making : How to Cast Jewelry

The question was how to cast jewelry. So for
the next few minutes, we’re going to go through the entire process and I’m going to show you
a process called centrifugal jewelry casting and this is how we do it. We’re going to do
what we call “sprue the wax” and this right here is the sprue, and it’s a passage way
which allows the wax to escape the mold and the metal to get into the mold. So what I’m
going to do here is I’m going to heat this rubber base up. I’m going to stick this wax
pattern right in here, and let it harden. Before I actually attach this wax to this
rubber base, I weighed this wax because there is a very specific weight ratio of the weight
of wax to the weight of metal, because you have to know how much metal it’s going to
take, whether it’s gold or silver, eighteen carat, fourteen carat, that you need to know
how much metal it’s going to take to cast. So now I’m going to put this sleeve over it
that’s called a flask. Now, as we’re mixing this investment compound, it’s actually introducing
air into the compound and we need to remove all of the air because we need a totally air-free
compound. And how we’re going to do that is by use of a vacuum chamber. We’re going to
take our compound, and you can start to see thee air bubbles starting to rise. We need
to get rid of all of those. We’re going to place it under a bell jar on a vacuum table,
hit the switch, and now we’re going to start to remove the air from this investment compound.
Okay, now you can see thee investment start to rise as the air is being drawn out of it,
and it’s going to start to boil, and it’s going to get to a very vigorous roll. Now
right here, this whole system is on a shaker table where you can get aggressive and knock
that air bubbles free. Alright now, we’re going to pore this investment, and here’s
our wax pattern in the flask, we’re going to pour it in, but we’re not going to quite
fill the mold up. Now this time, I want to tap it lightly because there’s wax patterns
inside the flask. I don’t really want to get aggressive. And now, I’m just going to set
it aside for an hour and fifteen minutes, and when it hardens, we’re going to put it
in the oven. We’re going to set this flask, which is now fully hardened, we’re going to
set it in the oven, and now I’m going to bake this for about six hours, and the wax will
now go out the sprue. The oven is going to go to about fifteen hundred degrees, which
is going to melt the wax, the wax will just exit through the sprue and just burn up in
the oven, and it’s going to leave a hollow cavity of thee exact impression of the wax
pattern inside this plaster mold and our next step will be to take it out of the oven after
six hours and then we’re going to put it in a centrifugal casting machine, and we’re actually
going to force the gold into that cavity. So far, we’ve injected a rubber mold, we’ve
invested a flask, we’ve casted and we’ve quenched it and now, this is where we are. So now,
we need to make this into a piece of jewelry and here’s what goes on next. First thing
I’m going to do is I’m going to cut the sprue off. Alright, next we’re going to take a file,
and file the sprue down. Now I’m going to switch to a round file, and I’m going to do
the inside of the ring. Now that the ring’s been filed, now we’re going to switch to just
a sand paper. It’s wrapped around about a one inch square stick and what I’m going to
do is now take and sand out my file marks. Now we filed the inside, filed the outside,
sanded the outside, now we’re ready to take it to final polish. Now we’ve moved back to
the polishing room and now what we’re going to do is put a high polish on this ring we
just made.
And that is how you make gold jewelry.

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