The causes of porosity today are still shrinkage and gas, just as they were when I wrote my first article on porosity in 1976. However, most of the porosity that we see in jewelry castings today is shrinkage porosity, which results from the metal contracting during freezing and solidification. There is a difference in appearance between shrinkage porosity and gas porosity. Gas porosity generally shows up on the surface of castings...
We often have newcomers to the casting business who are curious about the casting process. Everyone from hobbyist to fledgling businesses wants to know the basics of casting gold and silver. This guide will give you a brief idea of how the process works, and take you through the general steps to cast gold and silver.
When the rubber molds are correctly made and wax patterns produced, the stone-in-wax setter should be able to easily and quickly insert the stones into the wax by gently pressing them down into the setting, spreading the prongs apart and by using a good, flexible wax with memory, the prongs should snugly hold the stones. When channel settings are made correctly, the stones should easily slide into place with gentle pressure.
It is very important to know how to determine the correct metal weight for each wax tree before you cast. Knowing the correct metal weight will ensure that you melt the right amount of metal for your cast. This will make your casting process more cost-effective and more reliable.
The first thing for all of us to remember is that Platinum, just like other metals, has its own list of characteristic in all phases of manufacturing that must be professionally addressed. The following guide is designed as an easy to use list of Platinum manufacturing related problems. The guide is intended to get you looking at ways to improve your operation or reduce your costs to manufacture.