# Kat's Casting with BlueCast Notes

## Sterling Silver Conversion

Measure the grams of BlueCast and enter it in the first column. The second column is the quantity of items, and the third column is an estimate of the grams of metal, and the last column includes an extra percentage that is entered in the box at the top, rounded up to the nearest gram.

**I am working on a fix to NOT round up the last column to a whole number, but instead give it one or two decimal places, or give the option to increase the precision for more expensive metals.**

This is ONLY approximate...I'm not a javascript programmer. I have tested the functionality, but would recommend you double-check any questionable numbers. I'll tweak the layout along the way, like resizing columns and lining up the metals.

## Specific Gravity of BlueCast: 1.09

To find the weight of metal needed:

- Take the specific gravity of the desired metal and divide by 1.09. This gives you the "factor."
- Multiply the grams of your printed model by this factor. Be sure to include the sprues in your calculations, whether they are wax or resin.

### Example:

- Model weight is
**0.56 grams** - Casting in sterling silver,
**10.36 specific gravity** - Take 10.36 and divide by 1.09 to get
**9.5** - Multiply the weight of the model, 0.56 grams, by 9.5
- The weight of the metal needed is 5.32 grams
- Add 10%, so 5.32 x 1.1 = 5.85 grams

* The legal specific gravity of Pewter in France is 7.764, however this calculator uses 7.4 which is more common in the US.