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Pillar of the Community
United States
3644 Posts |
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Pillar of the Community
613 Posts |
Ok good read,goes to say a bunch of not sure and unknowings for the most part.
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Pillar of the Community
Canada
2632 Posts |
Nice find, I found a 1939 and a 1916 Wheat cent today but no lam. Anyway I would most certainly say that an improperly mixed alloy could and would be much more likely to separate..IMO |
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Bedrock of the Community
United States
62064 Posts |
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Moderator
 United States
56855 Posts |
Would a bad mix of copper cause a bad adhesion of the metal leading to a LAM? John1  |
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Pillar of the Community
 United States
5828 Posts |
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Bedrock of the Community
United States
62064 Posts |
I would think it is more in the rolling of the stock. A piece of loose copper scrap could get rolled into the roll. Then after the stock was cut, it may com loose. https://video.search.yahoo.com/vide...d=15.1&rurl=https://www.youtube.com/watch%3Fv=pkb8SYjlAqc&tit=Rolling+Machine+Mill+Copper+%2C+Aluminium+&+steel+%2C+VIDEO+NO+1+.wmv&c=3&sigr=11bqpnad8&sigt=121ate13j&sigi=11r987beg&back=https://search.yahoo.com/yhs/search%3Fp=copper%2Brolling%2Bmill%2Bvideo&ei=UTF-8&hsimp=yhs-004&hspart=mozilla&sigb=1358mfq0f&ct=p&age=1346601600&fr2=p:s%2Cv:v&hsimp=yhs-004&hspart=mozilla&tt=b I feel it is this stage that peeling metal happens at this point. Not in the mix. |
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Pillar of the Community
United States
1034 Posts |
So.... kinda like a strike through, that works it's way out later. But instead of strike through, a rolled in. I can see that being the case in most instances. But I have some coins that have lamination issues on the whole surface. Almost look like they are a woody, but under closer examination, the whole coin a pears to be paling in a woody like appearance. Is it possible there are different types of lamination errors Coop?
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Bedrock of the Community
United States
62064 Posts |
Yes. Some are I feel, rolled onto the stock material and other times a break down of the stock material. But I just found a lot better detailed explination on Mike Diamond's website on this subject: http://www.error-ref.com/?s=lamination |
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Pillar of the Community
United States
1034 Posts |
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Valued Member
 Canada
497 Posts |
Thanks for the link, Slamnbass, interesting read.
I was thinking along the same lines of what John1 said, but I now understand that a change in the alloy composition will not affect adhesion. Thanks everyone for your comments.
Edited by west- canuk
03/18/2015 12:13 am
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Bedrock of the Community
United States
12437 Posts |
The same conditions that cause improper mixing of the alloy can also cause laminations due to poor bonding of areas with a heterogeneous mixture. With that said, slag and other impurities can also cause laminations in an otherwise normal coin. These impurities can be introduced during the alloying process or rolled in as the thickness is set for the metal stock sheets. Pictured below is one of the worst alloy mixtures you could find. The large diagonal stripe on the reverse has a series of small laminations starting at E and along the periphery as it crosses ONE CENT.   Edited by biokemist6
03/18/2015 12:40 am
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Pillar of the Community
Canada
2632 Posts |
Very nice cent Biokemist6 and good explanation too.
I know poorly made (after market & counterfeit) auto and airplane parts have come apart under normal wear due to bad metal.
A good and proper alloy mix is much less likely to separate under stress..IMO
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Moderator
United States
56855 Posts |
Bio said what I was thinking  John1 |
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Pillar of the Community
613 Posts |
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Posted 03/15/2015 11:56 pm
