Difference between revisions of "Casting"
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==How To Calculate The Casting Metal Amount == | ==How To Calculate The Casting Metal Amount == | ||
| − | The amount of metal needed to fill the mold = (W | + | The amount of metal needed to fill the mold = (W x SGm + 15%) |
When: | When: | ||
*W = Grams of wax or other model medium. | *W = Grams of wax or other model medium. | ||
| − | |||
**SGm = Specific gravity of metal used for casting. | **SGm = Specific gravity of metal used for casting. | ||
The following example uses wax as the model medium and sterling silver as the metal. | 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 | + | Let’s say that the weight of the sprue base, model, and sprues comes to 153 grams. |
| − | **So, | + | 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 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 | + | 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. |
Revision as of 09:08, 31 May 2020
Lost Wax Casting Process - video slide show
This 6 minute video slide show summarizes the main processes involved in lost wax casting.
- Casting Process Slideshow: Photos of casting lessons showing mostly the highlights of the investment process and spin casting setup. More will be added to this over time.
- Amy's notes from lesson with Mike
How To Calculate The Casting Metal Amount
The amount of metal needed to fill the mold = (W x SGm + 15%)
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.
