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Reversible ingot mold

Jewelry Discussion
#1

Hello,

I just bought a reversible ingot mold from Contenti and I was
wondering if anyone knew how much metal (sterling) I need to fill in
the cavity? Or better yet if anyone knew a formula to use to figure
out how much metal I need melt when I want to fill in the 3, 4, 5,
and 6 mm diameters cylinder or the sheet section (70mm X 45mm X
4mm).

Thanks :slight_smile:

#2

Look at a refiner’s wire chart, most should have the weight per
length in whatever given gauge. You could interpolate from their
sheet chart for your ingot. Hoover and Strong’s charts are perfect.

#3 
I just bought a reversible ingot mold from Contenti and I was
wondering if anyone knew how much metal (sterling) I need to fill
in the cavity? Or better yet if anyone knew a formula to use to
figure out how much metal I need melt when I want to fill in the 3,
4, 5, and 6 mm diameters cylinder or the sheet section (70mm X 45mm
X 4mm). Thanks :)

weight = specific gravity X volume

–> weight of cylinder = specific gravity X pi X radius X radius X
height Assuming you are pouring sterling silver which has a specific
gravity (density) of 10.4 g/cm^3 and a ingot mold that is 50 mm deep:

–> 3mm cylinder ingot of silver = 10.4 g/cm^3 X.15 cm X.15 cm X
3.1415927 X 5cm = 3.67 g

(remember that radius is 1/2 the diameter and that the specific
gravity is in cm not mm) A sheet section would just be the 3 sides
multiplied together (WxHxD) times the specific gravity.

Scott Garrison

#4

Hello,

the formula for calculating the volume of a circle is r[2] * pi * h * s.g.

R= radius in cm
pi = 3.1415
h = hight in cm
s.g. = specific gravity for the metal

Example:

r = 0.15 cm
h = 7.4 cm

(0.15)" x 3.1415 = 0.0706 cm2
0.0706 x 7.4 = 0.5230 cm2
0.5230 x 10.3 = 5.387 gr for STERLING silver

Make sure that you have the exact dimensions because it makes a
different as I’ll show you.

r = 0.14 cm
h=7.4 cm

(0.14)" x 3.1415 x 7.4 = 0.4556 cm2
0.4556 x 10.3 = 4.693 gr for St silver

… and this is only 0.1 mm or 0.069 gram of st silver which is
not a big deal for silver but for other more expencive metals it
matters. This whould be 16.6 US$ without labor costs and alloy
metals. However, it depends on how you look at it and how you need to
do your calculations in order to run your business.

Have fun and enjoy
Pedro

#5 
I just bought a reversible ingot mold from Contenti and I was
wondering if anyone knew how much metal (sterling) I need to fill
in the cavity? Or better yet if anyone knew a formula to use to
figure out how much metal I need melt when I want to fill in the 3,
4, 5, and 6 mm diameters cylinder or the sheet section (70mm X 45mm
X 4mm).

I wanted to wait and see what others said before I chimed in with my
flippant but correct answer:

Just use what you need.

I use one of these and have sort of figured out by looking how much
metal I need to fill the mold, but if I add too much it (hopefully)
forms a button on at the top I clip the button off with a bolt
cutter. It helps to have a clean desktop so if you do pour too much
metal you can pick it up & reuse it.