2018 Shield Cent Defective Planchet (Rolling Induced Fissure, Ragged Clip, Or Fissure) - Page 2

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Author	Replies: 21 / Views: 1,611	Page: of 2

Halo1st Pillar of the Community United States 2775 Posts	Posted 06/20/2024 10:38 pm Quote: Blow holes I think typically encompass the interior of the coin, not the edge. Why? The punch pattern should not deviate. It punches blanks start to finish in a set pattern. If the strip has a Blow Hole in it, it could fall / align up in the center or same on the edge. Thanks, Doug. Report this Post to the Staff
mikediamond Pillar of the Community United States 2738 Posts	Posted 06/20/2024 11:05 pm It's a "ragged fissure". It marks where the zinc of the coin metal strip pulled apart from tensile stress. Error coin writer and researcher. Report this Post to the Staff
Petespockets55 Pillar of the Community United States 5780 Posts	Posted 06/21/2024 2:05 pm Quote: It's a "ragged fissure". It marks where the zinc of the coin metal strip pulled apart from tensile stress. And on this coin, that "pulling apart" happened before the plating process, correct? Words of encouragement are one of the major food groups. We need to consume them regularly to thrive and grow. Report this Post to the Staff
mikediamond Pillar of the Community United States 2738 Posts	Posted 06/21/2024 11:04 pm Yes, the raw zinc strip pulled apart. The planchets are plated much later in the production process. Error coin writer and researcher. Report this Post to the Staff
Petespockets55 Pillar of the Community United States 5780 Posts	Posted 06/22/2024 12:42 pm Thanks for the confirmation, Mike. Also, do you know of any available resource for the modern Lincoln planchet production (before they are sent to the mint)? Is the proto-rim added before or after the plating process? Is the proto-rim still added by an upturning machine or might it be applied by striking the type 1 planchet with "forming dies"? I've often wondered if zinc was too brittle to form with an upturning machine and if anyone knows how the problem of split plating seems to have been resolved. Split plating doesn't seem to be as prolific as it once was. Maybe I should have sent these questions in an email, but I thought others might benefit from any insight you can share. Thanks. Words of encouragement are one of the major food groups. We need to consume them regularly to thrive and grow. Report this Post to the Staff
mikediamond Pillar of the Community United States 2738 Posts	Posted 06/22/2024 2:01 pm The planchet is upset before plating in a conventional upsetting mill. This, and the plating, is all done by the outside contractor. Error coin writer and researcher. Edited by mikediamond 06/22/2024 2:01 pm Report this Post to the Staff
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