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198(2) Copper Elliptical Planchet-Not "Clipped"?

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 Posted 06/18/2024  10:22 pm  Show Profile   Bookmark this reply Add Oldgrouchyguy to your friends list
Dearborn: here is a blow-up
Cujohn: I saw that too; it would have to be an edge ding, as would the dot by the 8. If they are not dings, then they must be part of the obv. die?
1982-Copper-Elliptical-Planchet-Not-
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 Posted 06/19/2024  3:08 pm  Show Profile   Bookmark this reply Add Cujohn to your friends list

Quote:
I just can't see how a 'clip' like this can occur.
You can't think of it as a regular clip. It came from the end or side of the roll of copper sheeting. Like a ragged clip.
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 Posted 06/19/2024  4:18 pm  Show Profile   Bookmark this reply Add jfeed to your friends list
Very nice. I like it.
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 Posted 06/20/2024  12:56 pm  Show Profile   Bookmark this reply Add Oldgrouchyguy to your friends list
Cujohn had it right.... it did pass through the upsetting mill, so it must have been cut from the strip punching-out all the other blanks. That part of the strip was very thin and did not have enough metal to fill the planchet cutter. Think that where the part of the rim that you can see was probably but not necessarily at the right or left end of the strip, the cutter punching what was remaining. What we see as "elliptical" is the rolled-out end of the strip
Edited by Oldgrouchyguy
06/20/2024 12:58 pm
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 Posted 06/20/2024  11:10 pm  Show Profile   Bookmark this reply Add mikediamond to your friends list
Elliptical clips like this can form in more than one way. An incompletely punched hole can fail to advance properly and is sliced completely through on a second pass. The two parts eventually separate as a crescent clip blank and an elliptical blank. It's also possible for a blank to get trapped beneath the strip, lag behind, and get sliced through again. There may be other possibilities, but I'd have to go back and read my previous analyses.
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 Posted 06/21/2024  3:13 pm  Show Profile   Bookmark this reply Add Oldgrouchyguy to your friends list
Thaks Mike... as you can see, this one has pretty much normal thickness at one end, and is extremely thin opposite that
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 Posted 06/21/2024  3:19 pm  Show Profile   Bookmark this reply Add Dearborn to your friends list
Thanks Mike - I had not thought of the blanks getting caught under the material and getting cut again. makes sense
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 Posted 06/21/2024  11:03 pm  Show Profile   Bookmark this reply Add mikediamond to your friends list
The tips of the coin's long axis will contact the collar and will therefore be thicker than parts of the coin that were free to expand within the striking chamber.
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 Posted 06/22/2024  12:18 am  Show Profile   Bookmark this reply Add Oldgrouchyguy to your friends list
This obviously passed through the Upsetting Mill, and would be a characterized as a Ty.2 planchet, thus making the rimmed side thicker, irrespective of the striking chamber movement?
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 Posted 06/22/2024  2:05 pm  Show Profile   Bookmark this reply Add mikediamond to your friends list
There is no way to determine if this elliptical blank passed through the upsetting mill. It most likely passed through without picking up any evidence of that passage. The oval blank will slide through lying on its side and pushed along by the planchets behind it. The ends of the football will not be squeezed by the upsetting mill.
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 Posted 06/22/2024  6:42 pm  Show Profile   Bookmark this reply Add Oldgrouchyguy to your friends list
Thanks, Mike. Always learning something... I would assume that it had passed through the Mill by default. I wasn't aware that an unmilled coin could produce a squared edge
Edited by Oldgrouchyguy
06/22/2024 6:42 pm
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 Posted 06/22/2024  6:46 pm  Show Profile   Bookmark this reply Add Oldgrouchyguy to your friends list
I'm surprised that ANACS didn't weight it. I'll do that after I crack it out for better pics
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 Posted 06/22/2024  9:39 pm  Show Profile   Bookmark this reply Add mikediamond to your friends list
Oldgrouchyguy commented, "I wasn't aware that an unmilled coin could produce a squared edge." Upsetting helps in formation of the design rim but is not always necessary. In the case of your elliptical clip blank, the force of the expanding blank is concentrated at the ends of the football, helping ensure the formation of a proper design rim. Also, because the elliptical blank is smaller than a circular blank, the force of the dies' impact is concentrated in a smaller area. The increased effective striking pressure also produces a well-formed design rim at the tips of the football.
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