the question was how to cast jewelry. so forthe next few minutes, we're going to go through the entire process and i'm going to show youa process called centrifugal jewelry casting and this is how we do it. we're going to dowhat we call "sprue the wax" and this right here is the sprue, and it's a passage waywhich allows the wax to escape the mold and the metal to get into the mold. so what i'mgoing to do here is i'm going to heat this rubber base up. i'm going to stick this waxpattern right in here, and let it harden. before i actually attach this wax to thisrubber base, i weighed this wax because there is a very specific weight ratio of the weightof wax to the weight of metal, because you have to know how much metal it's going totake, whether it's gold or silver, eighteen
carat, fourteen carat, that you need to knowhow much metal it's going to take to cast. so now i'm going to put this sleeve over itthat's called a flask. now, as we're mixing this investment compound, it's actually introducingair into the compound and we need to remove all of the air because we need a totally air-freecompound. and how we're going to do that is by use of a vacuum chamber. we're going totake our compound, and you can start to see thee air bubbles starting to rise. we needto 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. nowright here, this whole system is on a shaker table where you can get aggressive and knockthat air bubbles free. alright now, we're going to pore this investment, and here'sour wax pattern in the flask, we're going to pour it in, but we're not going to quitefill the mold up. now this time, i want to tap it lightly because there's wax patternsinside the flask. i don't really want to get aggressive. and now, i'm just going to setit aside for an hour and fifteen minutes, and when it hardens, we're going to put itin the oven. we're going to set this flask, which is now fully hardened, we're going toset it in the oven, and now i'm going to bake this for about six hours, and the wax willnow go out the sprue. the oven is going to
go to about fifteen hundred degrees, whichis going to melt the wax, the wax will just exit through the sprue and just burn up inthe oven, and it's going to leave a hollow cavity of thee exact impression of the waxpattern inside this plaster mold and our next step will be to take it out of the oven aftersix hours and then we're going to put it in a centrifugal casting machine, and we're actuallygoing to force the gold into that cavity. so far, we've injected a rubber mold, we'veinvested 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 thingi'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 dothe inside of the ring. now that the ring's been filed, now we're going to switch to justa sand paper. it's wrapped around about a one inch square stick and what i'm going todo 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 tothe polishing room and now what we're going to do is put a high polish on this ring wejust made.and that is how you make gold jewelry.
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