The Process
Create a wax model of a new piece of jewelry, then add sprues to the piece(s), creating a tree. Secure the tree to a rubber base. Fit metal cylinder/flask to fit into the rubber base with the wax tree.
Mix water, investment powder, and vacuum/debubble for 2 minutes. Pour investment into the flask, submerging the wax tree. Again vacuum/ debunked the investment in the flask this time. The investment will dry and harden. Once hardened, it is ready to go into the kiln.
Bake for approximately 8 hours, slowly ramping up the temperature until it reaches 1200 degrees. When the flask has reached the proper temperature, it is ready to be cast. The wax will melt and disappear, leaving an imprint in the investment that is identical to the wax model.
The flask now gets transferred to a centrifuge which has two arms. The arms are wound up, and the flask is placed in the cradle of one arm. Add the weighed out metal to the crucible ( like a bowl). When the metal is melted (molten), we butt the flask up to the crucible, which has a hole that lines up with the flask. Let go of the centrifuge to allow it to spin. The metal is forced into the flask, filling the empty hole that was left when the wax melted.
When the centrifuge stops spinning, we allow the flask to cool, until the metal is not glowing. Once cooled, we submerge the flask in a bucket of water, and most of the investment falls away. Now you have a metal tree identical to the original wax one.
We cut off the sprues and grind down the leftover nub. Take care of any imperfections with a medium grit wheel on a flex shaft. Do a series of polishing and possibly add an oxidation or jump ring that the piece needs. It gets a final polish and is ready to wear when that is all finished!