Last night's casting session was AWESOME!!! Here's a pic of my centrifuge. The white thing is the crucible, behind the crucible (the dark colored metal thing) is the flask. The square piece of metal you see on the right is the counter weight - it helps balance the centrifuge and keeps it from shaking.
Here's a close up of the crucible and flask. The silver has already been slung into the flask.
Two flasks that have been cast. You can see the metal "button" - AWESOME!
After the flask has cooled a little bit, it is dunked into a bucket of water. The water shocks the investment and causes it to bubble like crazy and break apart. The investment falls out of the flask and reveals the rings (or whatever item was cast). I then use a tooth brush and small screwdriver to remove most of the investment that clings to the casting. Then the rings go into the ultrasonic to get the remaining investment out of the little grooves. :^)