How to Do Lost Wax Casting

Lost wax casting is typically used to create small pieces of jewelry. In lost wax casting, carved wax is used to create a mold that is then used to shape molten metal. The finished cast of the metal will have the same shape as the carved wax.

Difficulty: Challenging

Instructions

Things You'll Need:

• Centrifugal casting machine
• Molten metal
• Water
• Small brush

Prepare the Mold

1. Attach the sprue to the carved wax and then to the base using a wax pen.

2. Join the flask to the base.

3. Pour the prepared investment into the flask. Use enough to fill the entire flask.

4. Allow the flask to set overnight or until the investment is completely hardened.

5. Remove the base.

6. Heat the flask slowly in a kiln to 1200 degrees F. The heating method you use may vary, depending on the type of metal you are casting.

7. Remove the flask after the wax is completely dissipated.

Cast the Metal

8. Place the flask into the centrifugal casting machine or vacuum table.

9. Force the molten metal into the mold using the centrifugal casting machine or vacuum table. Follow the instructions provided with your device.

10. Submerge the flask in cold or lukewarm water until the investment is almost completely dissolved. Sway it gently in the water.

11. Remove the casting from the flask.

12. Clean the surface of the cast metal using a small brush.

Tips & Warnings

• Sterling silver and gold work best for this type of lost wax casting.
• Observe all safety precautions provided with your centrifugal casting machine or vacuum table. Always use heat protection or proper tools when handling molten metal or a heated flask.