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Lost wax casting is an antique art. The technique was first employed by the early Egyptians but it was also independently discovered and used tribal artists in South America who used it to cast pre-Columbian gold. It was rediscovered by the great Renaissance goldsmith Benvenuto Cellini. While modern versions of the lost wax process worker a few differences, such as industrial vacuums to pull the molten gold down into the mold, the lost wax method as used today is truly very similar to that employed by the goldsmiths of Egypt and the pre-Columbian tribes.
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The Lost wax method is practical for casting both gold and silver alloys. Although it is most commonly used for rings and bracelets, the lost wax process can be used for casting a variety of objects. This method is currently used to generate about 60% of all karat gold jewelry, as well as a essential part of all silver jewelry, enabling manufacturers to furnish pieces in multiple numbers at a suitable production cost. The lost wax method allows jewelry artists to copy the finest information into a gold casting. The jewelry produced by casting can also be field to added treatment by soldering on added items, etc. The modern version of the lost wax casting process can be described as follows:
1) From an original design, a model is made in metal. A rubber mold is then made from the model.
2) From this rubber mold multiple copies are made in wax. The wax copies are attached together by a connecting sprue. A group of wax copies are attached together to form a what is called a tree.
3) The tree is then settled in metal flask and covered with plaster of Paris. Once it hardens, the plaster mold is then heated in an oven. The wax melts and is lost, leaving a hollow plaster mold.
4) Molten gold is then poured into the mold as the whole mold is settled in a vacuum the vacuum action draws the gold down into every crevice of the mold forming a excellent copy of the original design.
5) The plaster is then broken and washed away from the now cooled gold casting. The private gold items are now ready to be cut from the treaty for hand finishing and polishing.
Now if the antique and primitive peoples of Egypt and South America could do lost wax casting, and furnish gorgeous works of art, then so can you - with the proper tools and training. Most of the essential tools and equipment can be purchased right over the internet, and books are ready to teach you what you need to know. Here are the basics of how you can do your own lost wax casting using the pressure of steam.
1) Gold, Silver or other precious metals in a clean and castable form (often used jewelry needs cleaning and melting with borax to take off dirt, corrosion and impurities).
2) A torch great enough to melt a few ounces of gold or silver.
3) Lost wax casting speculation material (the plaster like stuff).
4) A rubber mixing bowl - it is leading to mix your speculation material with as few bubbles as possible. The bubbles tend to adhere to the wax model and generate bubble bumps on the closed product. Shake or vacuum the material to take off bubbles.
5) discrete wax models and extra wax to make way sprues. The jewelry wax material is a special type, not just normal paraffin as is used in candles. It has a known density so that the precise amount of metal can be melted for the casting process.
6) A burn out oven capable of about 800 F, which is used to vaporize the waxes.
7) A "crucible" which in this case is a metal tube, to contain the speculation and wax for the whole casting process.
8) A steam generator - commonly a metal can which has wet material attached to the inside.
After the wax is made, the sprue attached, the speculation poured, and the whole goods baked to drive out the wax, molten metal is poured in and the steam unit pressed on top. Steam thus created pushes the metal down into the mold. After a time is waited for the metal to cool and solidify, the casting is put under water and the speculation material dissolves away.
As a note, casting molten metal can be very dangerous. Molten metal splattered on clothing or skin quickly causes severe burns. protection of the eyes and other parts of the body is necessary. Wax vapors can be flammable so precautions need to be taken there as well so that the room is fully ventilated. It is strongly urged that anything who would like to effort this process buy books that supply more information as to how this casting process is done, and read them carefully. These books will also added construe the essential protection precautions in detail.
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