Q. HOW DO YOU CALCULATE HOW MUCH YOUR GOLD SHEET WILL WEIGH?
A. To calculate the weight of gold needed: • Firstly the cm2
area must be worked out.
• Compare the size of gold needed against the square cm chart or a ruler. • Using the shaded area as the size needed, • I can see that I need 2cm x 3cm = 6cm2
.
Then using the bullion charts, like the one on the right which show the approximate gram weight per cm2
.
• I chose the metal for my work ‐ 9Y DF • The thickness of sheet I require ‐ 0.25mm.
Reading from the chart, I can see that for 9Y DF 0.25mm sheet the gram weight per cm2
is 0.28g. Multiply this by your calculated cm2 to give a final weight: 6CM2 X 0.28G = 1.68 GRAMMES TOTAL WEIGHT FOR MY PIECE.
9ct Yellow: DF ORDER
CODE
CAA 012 CAA 015 CAA 020 CAA 025 CAA 030 CAA 040
4 5 6 7 8 9
SHEET THICKNESS
0.12mm 0.15mm 0.20mm 0.25mm 0.30mm 0.40mm
SQ CM 0.13g
0.17g 0.22g 0.28g 0.34g 0.45g
WGT PER
SQ INCH 0.87g
1.08g 1.45g 1.81g 2.17g 2.89g
When placing an order please state length x width x thickness to avoid confusion.
Q. HOW DO YOU CALCULATE HOW MUCH YOUR GOLD WIRE WILL WEIGH? A. Simply multiply the gram weight per cm, given in the bullion tables, by the amount of wire required. For example: For 9cm of 9ct Yellow DF “D” Shape Wire ‐ Size 3.0 x 2.0mm ‐ Code LAA 300
Using the bullion chart in the same way as shown above, the wire weight is found to be approximately 0.60g per cm. Therefore, multiplying this by the length desired gives: 9cm x 0.60g = 5.4 grammes of gold in total.
Q. HOW DO YOU CALCULATE HOW MUCH WIRE IS NEEDED TO MAKE A RING? A. Determine the internal circumference of the ring by using a ring stick or check out our ring size chart on page 88. This establishes the length of metal needed for the ring.
Q. HOW TO MEASURE THE CROSS SECTIONAL AREA OF: A SQUARE OR RECTANGLE Width 4mm
Thickness 3mm
1. Convert sizes to centimetres if using to determine a weight requirement i.e. 4mm is 0.4cm (divide mm by 10).
2. Multiply thickness by width i.e. 0.4 x 0.3 = 0.12cm2 . 66 Click cooksongold.com Call 0345 100 1122
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A CIRCLE
Diameter 6mm
1. Convert size to centimetres if using to determine a weight requirement i.e. 6mm is 0.6cm.
2. Divide diameter by two to give radius i.e. 0.6 ÷ 2 = 0.3cm
3. Square the radius (times by itself) i.e. 0.3 x 0.3 = 0.09cm
4. Multiply the squared radius by 3.142 (pi) i.e. 0.09 x 3.142 = 0.283cm2
