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cwgii
Penny Hoarding Member
USA
924 Posts |
 Posted - 08/27/2010 : 10:16:25
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i know i am just not using the right search words.
does anyone know of 'large' rounds being made. the gf's son came up with the idea he wanted one. after saying, imagine how big a coin we could make, if we melted a whole 25.00 box of cu.
so , xmas present presented itself.... if i can find a 'coin' of 8oz to a kilo.
thanks
charlie
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Cerulean
Penny Hoarding Member
USA
993 Posts |
Posted - 08/27/2010 : 13:38:00
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It's math time!
A $25.00 box of cents, filled entirely with copper Lincolns, would weigh 2500 X 3.11g = 7775 grams.
The density of copper is roughly 0.009 grams per cubic millimeter. So the volume taken up by all the copper together is 7775 grams / 0.009 g/mm3 = 863,889 cubic millimeters.
How big of a coin will 863,889 cubic millimeters make?
I will assume that the diameter to thickness ratio of the cent will be preserved. The cent is 19.05 mm in diameter and 1.55 mm thick, giving a D/t ratio of 12.29. That means that the diameter of our big coin will be 12.29 times larger than the coin's thickness.
The volume of a cylinder is V = Pi * r^2 * h
In terms of the diameter, that is V = Pi * d^2 * h / 4
Now, replacing d with 12.29*t, I can express the volume in terms of thickness, V = Pi * (12.29 * t)^2 * t / 4
Now, I solve the equation for t = ( (4 * V) / (12.29 * Pi) )^0.333
And the result is t = 44.7mm (or 1.76 inches). The corresponding diameter would be 1.76 inches * 12.29 = 21.6 inches.
If you melted a whole box of copper cents into one big cent, keeping the coin proportions the same, you'd make a coin that is 21.6 inches in diameter, 1.76 inches thick, and weighs 7.8 kilograms. |
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Cerulean's Standing Offer: $3/lb shipped for foreign coins |
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uthminsta
1000+ Penny Miser Member
USA
1872 Posts |
Posted - 08/27/2010 : 16:21:03
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| Would you have the 5% other metals still included in that, or would it be 999 fine after the creation of this Franken-coin? |
Come to the new and improved realcent: http://realcent.org
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abe
Penny Pincher Member
117 Posts |
Posted - 08/27/2010 : 16:27:49
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| Now that would be one LARGE copper round. |
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Flbandit
Penny Hoarding Member
USA
851 Posts |
Posted - 08/27/2010 : 16:42:49
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| My eyes! Can't take Math!! |
Are you throwing that out? |
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PreservingThePast
1000+ Penny Miser Member
USA
1572 Posts |
Posted - 08/27/2010 : 17:04:44
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quote:
Originally posted by cwgii
i know i am just not using the right search words.
does anyone know of 'large' rounds being made. the gf's son came up with the idea he wanted one. after saying, imagine how big a coin we could make, if we melted a whole 25.00 box of cu.
so , xmas present presented itself.... if i can find a 'coin' of 8oz to a kilo.
thanks
charlie
Have you checked The Copper Cave which Nate runs? |
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natsb88
Administrator
USA
1850 Posts |
Posted - 08/27/2010 : 20:48:04
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The largest copper round I have come across to date was a 1 pound giant 999 fine copper penny. I don't have it any more (sold it to a magician who wanted to use it in his tricks  ) but I have a couple pictures.
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Nate
The Copper Cave
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HoardCopperByTheTon
Administrator
USA
6807 Posts |
Posted - 08/27/2010 : 22:59:57
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That is pretty cool Nate. You know we all want one now.  |
If your percentages are low.. just sort more. If your percentages are high.. just sort more.
Now selling Copper pennies. 1.6x plus shipping. Limited amounts available. |
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Verbane
Penny Sorter Member
USA
42 Posts |
Posted - 08/27/2010 : 23:21:19
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I did a a little searching, this is what I found. Not sure its worth $60.00. Maybe Nate could give a good buy/sell estimate?
You must be logged in to see this link.
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"If everyone is thinking alike, no one is thinking" General George S. Patton |
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Verbane
Penny Sorter Member
USA
42 Posts |
Posted - 08/27/2010 : 23:25:34
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BTW searches for the "Great American Penny Co." were worthless, unless this was a product from You must be logged in to see this link.
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"If everyone is thinking alike, no one is thinking" General George S. Patton |
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MichaelOnion
Penny Pincher Member
USA
105 Posts |
Posted - 08/27/2010 : 23:32:01
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| Hey Nate, where did you come across that thing and how long ago? Something like that should be standard issue when you sign up for an account here |
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-M
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hobo finds
Penny Hoarding Member
838 Posts |
Posted - 08/27/2010 : 23:56:40
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| so the one with Cerulean's specs weighs 17.2 lbs?? |
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HoardCopperByTheTon
Administrator
USA
6807 Posts |
Posted - 08/28/2010 : 00:31:03
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| Well let's see.. if we use 3.141592653591 for Pi.. and allow for wear.. and melt in the plastic and cardboard for a box.. 17.10 lbs. |
If your percentages are low.. just sort more. If your percentages are high.. just sort more.
Now selling Copper pennies. 1.6x plus shipping. Limited amounts available. |
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slickeast
1000+ Penny Miser Member
USA
2533 Posts |
Posted - 08/28/2010 : 01:20:26
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ok Nate, now we need to find some more of those, cause I want one
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You don't have to be the BEST you just have to be.......SLICK
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Ardent Listener
Administrator
USA
4841 Posts |
Posted - 08/28/2010 : 06:29:15
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Yes, that was a nice looking coin but what's that .999 crap? I want one made out of 95% copper so it can be circulated.  |
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Think positive. |
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natsb88
Administrator
USA
1850 Posts |
Posted - 08/28/2010 : 07:23:14
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| I came across that about a year ago and haven't seen any more since. Ended up selling it for $40. |
Nate
The Copper Cave
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hawkeye
New Member
11 Posts |
Posted - 08/30/2010 : 18:23:33
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| I've been "lurking" for a while now, enjoying reading what everybody has to say. But this brought me out of my shell. I WANT THAT. And many more like it... |
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large copper rounds
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