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.

Things You'll Need

  • Sprue
  • Carved wax
  • Base
  • Wax pen
  • Flask
  • Investment
  • Kiln
  • Centrifugal casting machine
  • Molten metal
  • Water
  • Small brush
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Instructions

  1. 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.

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