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Pillar of the Community
United States
3330 Posts |
I hope someone can give me some guidance on this. I would like to know your opinion and why? Thanks for any help!  |
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Pillar of the Community
United States
5964 Posts |
I think it started out vertical from too much pressure or a couple different reasons. Then it folded over. I believe you can call it a Rolling Fold. I say that because you can see the edge that was not originally part of the rim.
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Pillar of the Community
 United States
3330 Posts |
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Bedrock of the Community
United States
62064 Posts |
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Pillar of the Community
United States
3516 Posts |
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Pillar of the Community
United States
5964 Posts |
Your welcome Pete. As I said, it starts out vertical and is caused by too much pressure. If it's just in one area the fin was probably caused by excessive pressure brought on because of a tilted die. If it goes around the whole coin, just too much pressure. After the strike, the vertical Rim Fin often "folds" over like yours has done. The main culprit for folding is circulation. So on your coin, the Vertical Rim Fin has become a Folded Fin. I'm pretty sure the term Rolling Fold applies. |
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Pillar of the Community
United States
3330 Posts |
Excellent explanation! Thanks!
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Pillar of the Community
United States
3330 Posts |
Quote:Your welcome Pete. As I said, it starts out vertical and is caused by too much pressure. If it's just in one area the fin was probably caused by excessive pressure brought on because of a tilted die. If it goes around the whole coin, just too much pressure. After the strike, the vertical Rim Fin often "folds" over like yours has done. The main culprit for folding is circulation. So on your coin, the Vertical Rim Fin has become a Folded Fin. I'm pretty sure the term Rolling Fold applies. I have been doing some more research on this. The description in the above quote seems to be an apt description of a "Folded Over Rim Fin". It turns out that it seems that this is not the same as a "Rolling Fold". A "Rolling Fold" is another name for "Blanking Burr" as can be seen in the following quote: Quote:Conventional blanking burrs ("rolling folds") are burrs that project from the edge of a blank. http://www.error-ref.com/?s=blanking+burr So I am going back to one of the 2 options I originally though (see my subject): it is a "Folded Over Rim Fin". Thanks, everyone for making me think and contributing to my education! I love research. I was also encouraged to look into this further by some additional comments I received. |
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Pillar of the Community
United States
2775 Posts |
First I have to ask if the strike is misaligned a bit? I think a lot of rim features are a product of this type of strike. All bets are off unless other signs are evident or point otherwise. After we rule that out then my attention focuses back on the feature again along with the edge. Is it actually raised higher than the design rim should be? If so possible rim Cud. That said this doesn't seem to be directly on the rim, but evolving from a gutter. My thoughts on a Rim Fin is they usually graduate slowly to a peak. This example seems to abruptly start and stop. Circulation is another factor to consider as things wear down and become distorted in the process. Thanks, Doug. Edited by Halo1st
11/30/2016 1:33 pm
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Pillar of the Community
United States
3330 Posts |
Quote:
First I have to ask if the strike is misaligned a bit? Yes it is a slight amount of misalignment. |
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Pillar of the Community
United States
3330 Posts |
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Pillar of the Community
United States
5964 Posts |
Thanks Pete, we both learn together. I wasn't positive on the Rolling Fold. A Folded Fin it is! In one of my previous posts Mike Diamond said this is a Blanking Burr:    |
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Pillar of the Community
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Bedrock of the Community
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I'm going to go with rim Cud. It starts and ends abruptly. If it was a folded over fin it would have had to be quite high to reach that far in when it was folded over, and while there is a fin continuing at either end of the anomaly it is much lower than it would have to be to create that kind of fold over. |
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Pillar of the Community
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3330 Posts |
Thanks Condor101 - I guess I will send it to JC.
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Posted 11/27/2016 7:45 pm
looks like a 
