Lost Wax Techniques for Jewelry Designers, Hobbyist and Artists. Tips and Notes.
Setting up the Wax Tree
The sprue is the central wax post that keeps connected all the models; it is inserted at the entrance of the flask base. See illustration.
The bigger pieces are setting closer to the base.
Allow at least ½ “ between flask wall and pieces inside.
Calculating Silver Weight
Wax Weight= W. Weight of wax sprue+ wax models.
Total Weight=TW. Base +Wax Weight.
TW-B = W
At this step we are calculating the Wax Tree Weight.
W x 10 = SW
The conversion factor from wax to Silver is the weight of wax times 10.
The Extra 10 to 12 dwt is added to cover the button weight. The button is the cavity of the dome that remains at the flask base and attached to the main sprue. See illustration
The proportion of water related to investment powder is about 3.5 to 4 parts of water by 1 part of investment. It is highly recommend to experiment with these proportions. The investment avidity for water could vary by brands and manufacturers.
Tip: The density of the investment mixture affects the surface of metal models (gold, silver, brass, etc. ) In other words, a lesser density makes smoother surfaces.
The Oven and Flask Temperatures
Tip: At the final oven stage we lowered temperature under the sterling silver melting point, avoiding a conflict of temperatures inside the flasks at the time we pour the metal inside it.
This entry was posted on January 14, 2013 by Jewelry Designer and Visual Artist. It was filed under Sources and Inspiration and was tagged with blue moon film works, casting flask, gold casting, hand made jewelry, Investment casting, jewelry making tips, jewelry techniques, jewelry tutorial, Precious Metals, pro metal casting, sterling silver casting, Wax.