Manufacturing Methods: Metal (liquid state) Forming 02_Investment Casting.

• The part to be cast is made of wax.
• Investment is poured into the flask surrounding the assembly leaving access to the sprue and puring basin.
• When the investment is set, the flask is inverted, melting the wax, which drains from the mold, leaving a cavity or void.
• The flask is righted and liquid metal is poured into the void via the pouring basin.
• When the metal solidifies, the plaster or ceramic is broken away and the runners and vents are removed from the casts parts.

Properties of procedure:
advantages:

• Superior surface quality.
• Thin wall or section, intricate parts.
• Minimum or no draft angle required (exept for pattern)

disadvantages:

• Limited to nonferrous metals.
• Limited in size.

typical parts:

• Precision parts, scientific and medical instruments, tools.
• Sculpture, jewelry, aerospace parts, airborne electronics.

The above video is more like a commercial for a company that casts parts, but I selected it because shows a detailed explanation of all the stages of the process.
Enjoy!

past videos:
Manufacturing Methods: Metal Forming 01_Sand Molding + Sand Casting