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Eisenhower Error - How Did This Happen?

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Domain555's Avatar
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 Posted 04/05/2015  09:43 am  Show Profile   Bookmark this reply Add Domain555 to your friends list Get a Link to this Reply
This tid-bit from Mike Diamond Error PDF


Quote:
Rolling Mill Errors Rolled-thick planchets Rolled-thin planchets Tapered planchets Rolling indentation (ES, Jan/Feb 2000) Rolled-in scrap (ES, May/June 2006) Bristles from descaling brush



Does anyone know what is a descaling brush?

What does it do?

Why would a coin need to be "descaled?

Could this "thing" in any way be responsible for the damage to the two coins in this thread?
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jasper62's Avatar
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 Posted 04/05/2015  10:15 am  Show Profile   Bookmark this reply Add jasper62 to your friends list Get a Link to this Reply

Quote:
Could this "thing" in any way be responsible for the damage to the two coins in this thread?



I'm not an expert but I know enough that it was done after the coin was struck. PSD Post Strike Damage, There's nothing more to it. Not sure what a descaling brush is myself but what ever it is, If It did cause the Damage it was after it was struck. PSD

As biokemist said

Quote:
Ultimately, it does not matter at all what tool what used to inflict the damage because it does nothing to change the fact that the coin was damaged post-mint. There is an almost infinite number of ways to damage a coin, some are plainly obvious while others are an enigma wrapped up in a riddle. Attempting to figure out the specific cause of damage can be a bit of a fool's errand since generally the only one who knows definitively is the person who did the damage in the first place.
Edited by jasper62
04/05/2015 10:38 am
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Domain555's Avatar
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 Posted 04/05/2015  10:37 am  Show Profile   Bookmark this reply Add Domain555 to your friends list Get a Link to this Reply
Jasper62


Quote:
I'm not an expert but I know enough that it was done after the coin was struck. PSD Post Strike Damage, There's nothing more to it. Not sure what a descaling brush is myself but what ever it is, If It did cause the Damage it was after it was struck. PSD


When is a "descaling Brush" applied?

Where is the coin when it is applied?

Why is a descaling brush applied to a coin?

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jasper62's Avatar
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 Posted 04/05/2015  10:42 am  Show Profile   Bookmark this reply Add jasper62 to your friends list Get a Link to this Reply
Domain555
I believe I clarified "I do not know what a descaling brush is"
Edited by jasper62
04/05/2015 10:56 am
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biokemist6's Avatar
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 Posted 04/05/2015  10:48 am  Show Profile   Bookmark this reply Add biokemist6 to your friends list Get a Link to this Reply

Quote:
Can a collar, or hammer, or anvil die ever have a catastrophic failure?

I am sure it can happen but it would be a very rare event for hardened die steel to spontaneously shatter, it is more of a gradual event with progressive cracking, chipping, and breaking.


Quote:
When is a "descaling Brush" applied?

Descaling brushes are large wire bristled rollers used to clean the metal stock sheets prior to punching out the blanks. Descaling brushes can leave marks on a planchet in extreme cases but it would take the form of fine parallel lines and not any type of rough radial pattern.



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