Something goes wrong. You spot it in production. Or worse, a customer calls to complain about a shipment. You can’t imagine what happened. What do you do first? Where do you look? How do you find the problem?

A good jewelry caster must be familiar with some of the basic concepts of metallurgy, ceramic science and mechanics, so that he can use these technologies for the benefit of his trade and art. Jewelry casters over the centuries have done fine work, as is attested to by gold castings done by early Egyptians, Africans…

1. Calculate investment and water requirements. Use a ratio of water/powder of 44\100 for gypsum based investments, ie. 44g (or ml) water to 100g powder. For any flask of diameter (D) and height (H), calculate investment requirement as:

A MAJOR PORTION OF THE JEWELRY MANUFACTURING process is affected by the quality of the master model. The way to successfully lower casting rejection rates lies in the execution of a precise master model. In lostwax casting, a design moves from model to mold to wax to investment to the final cast. Since it is…