When you cast an object such as a ring, you form it using a mould. Wax is used and the object to be made is fashioned in wax. The wax is coated with plaster and then the wax is removed through heating the mould, leaving a hollow form. In this case a gold ring will be cast when molten gold is poured into the hollow form. The gold is allowed to cool and solidify creating the ring.
- Skill level:
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Things you need
- Jeweller's wax for rings
- Flux made for gold
- Straight pin
- Tracing paper
- Sprue base
- Metal flask
- Centrifugal casting machine
- Artist's knife
- Propane/oxygen torch with a large tip
- Ceramic casting crucible
- Tongs for holding the ceramic crucible
Determine the size of the ring. Cut the width needed from the jeweller's ring wax tubing. Heat the ring mandrel by holding it over the flame of a torch. Place the ring on the mandrel and move it by turning it to the point of the correct size the ring is to be made. Remove the ring and flip it over so that the ring goes onto the mandrel in the opposite direction and again move it by twisting into position. This is done because the mandrel slopes and the flipping makes for a flat interior to the ring.
Draw the ring design on light weight tracing paper to make a pattern. Place the pattern on the wax. Use a pin and poke through the thin paper to make points which outline the design. Once you have the outlines you can then carve the wax using the artist knife.
Place the wax model on the sprue base. Use a drop of melted wax to set the sprue to the mould. Place this into the flask. Fill the flask with the plaster.
Heat the kiln. Place the flask into the kiln so that the wax will run out when heated. The result is a hollow mould of plaster. Leave in the kiln until the wax flow had finished. To eliminate possible trapped air tap the flask to release the last of the wax. Carefully remove the flask from the kiln and set aside to cool.
Light the torch and use equal amounts of the gases. Use the torch to heat the crucible until it is red hot. Coat the crucible with the flux, turning it while heating it with the torch. Place the gold into the crucible and add flux and heat until molten then add more flux. The melting temperature of Gold is 1945 ° Fahrenheit. Carefully pour into the plaster mould while maintaining the heat. Allow to cool.
Place flask into centrifugal casting machine which uses the spinning force to move the molten gold into the mould.
Carefully hammer the plaster to break it away from the ring.
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