asifshiraz
Plastic
- Joined
- May 22, 2012
- Location
- Austin, TX
Hi,
I'm a layman wanting to press my own coins. I researched a basic formula for how much tonnage is required to press coins of gold and silver, and the calculation came out to be like this:
Diameter = 50 mm = 1.97 inches.
Area = 1.97 x 3.14 = 6.1858 sq inches
Silver Density = 10.5 grams / cm cube = 172 grams / inch cube
Thickness of a 60 gram silver Coin = 0.057 inches
Ultimate Tensile Strength of silver = 20300 pounds per sq inches = 9.2 tons per sq inch
Force required = 6.1858 x 0.057 x 9.2 = 3.2 tons.
However, this 3.2 tons is far less than what professionals in the industry tell me. E.g. Kempler guy suggested that I would need this
63 ton Maypress to be able to mint coins.
USED 63 TON MAYPRES COINING PRESS - Kempler Industries
So my question is, why is the "theoretical" calculation coming to be so low, and why in real life a much higher tonnage is needed?
Will I totally not be able to press coins from a 4 ton press? Or would it make a difference on the quality etc.?
Thanks
Asif
I'm a layman wanting to press my own coins. I researched a basic formula for how much tonnage is required to press coins of gold and silver, and the calculation came out to be like this:
Diameter = 50 mm = 1.97 inches.
Area = 1.97 x 3.14 = 6.1858 sq inches
Silver Density = 10.5 grams / cm cube = 172 grams / inch cube
Thickness of a 60 gram silver Coin = 0.057 inches
Ultimate Tensile Strength of silver = 20300 pounds per sq inches = 9.2 tons per sq inch
Force required = 6.1858 x 0.057 x 9.2 = 3.2 tons.
However, this 3.2 tons is far less than what professionals in the industry tell me. E.g. Kempler guy suggested that I would need this
63 ton Maypress to be able to mint coins.
USED 63 TON MAYPRES COINING PRESS - Kempler Industries
So my question is, why is the "theoretical" calculation coming to be so low, and why in real life a much higher tonnage is needed?
Will I totally not be able to press coins from a 4 ton press? Or would it make a difference on the quality etc.?
Thanks
Asif