Casting

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Lost Wax Casting Process - video slide show

This 6 minute video slide show summarizes the main processes involved in lost wax casting.

How To Calculate The Casting Metal Amount

The amount of metal needed to fill the mold = (W x SGm + 10%)

When:

  • W = Grams of wax or other model medium.
    • SGm = Specific gravity of metal used for casting.

The following example uses wax as the model medium and sterling silver as the metal.

Let’s say that the weight of the sprue base, model, and sprues comes to 153 grams.

The base weighs 144 grams. 153 grams minus 144 grams equals 9 grams of wax model and sprues. Sterling silver has a specific gravity of 10.4. 
    • So, 9 grams x 10.4 = 93.6 grams of sterling silver.

To ensure there is adequate metal to fill the mold, add 10% to your total for the button.

    • 93.6 + 10%= 99.9 total grams of metal

Round it off to 99 grams of sterling to fill the flask. To calculate how many ounces that would be divide your number by 31, this weight is approximately 3.2 ounces of silver. This is handy when ordering your metal.