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 Replies: 28 / Views: 25,058 |
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Pillar of the Community
United States
1285 Posts |
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Valued Member
United States
116 Posts |
Biokemist6: Question... The copper and Zincoln blanks, not yet upset, is there a difference in size from the normal coin? Thanks buddy
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Pillar of the Community
United States
2189 Posts |
Wow! I just realized this thread is 8 years old
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Valued Member
United States
116 Posts |
Yer Jasper, I found it in my quest to understand non upset planchets and their size. A member in another forum I am in was giving what appeared to be misinformation, and I wanted to get actual facts on the sizing.
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Bedrock of the Community
 United States
12835 Posts |
@Michael - there should not be a diameter delta between upset planchet and finished coin. With the forces involved in minting coins, the coin would flatten to a ribbon if there were no collar to keep the metal from flowing out from between the dies (check out broadstrike errors). Quite the necro-bump here!  All good. Edited by CelticKnot
02/09/2018 01:30 am
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Valued Member
United States
116 Posts |
Thanks Celtic, I was looking at a blank, pre upsetting, I figured that an upset planchet and a finished coin should be the same size, I was trying to find out if there is a significant difference in the blank and an upset planchet/finished coin.I noticed that Biokemist6 had examples of all.
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Pillar of the Community
United States
997 Posts |
Don't they give blank planchets away on the Mint tour's? I am pretty sure I got one at Denver a year or two ago...
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Bedrock of the Community
United States
20753 Posts |
Blank metals for coins have been around for a long time. Many companies that make washers have some rather nasty people working there that make those blanks. They used to use them in what used to be called pay telephones. Not many left on Earth now though. Also, used in many laundromats. Someone I used to know that operated a laundromat showed me a pile of those blanks. Many places that have vending machines for food get those too. If they are made of Iron or Steel they jam up most vending machines.
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Bedrock of the Community
United States
17884 Posts |
Blanks and finished coins should be the same size, planchets are smaller. The edge compression of the blanks to upset the rim makes them smaller, and the planchets need to be slightly smaller in order to fall easily into the coining chamber. Then during striking the metal is pushed outward against the collar making them larger and the same size as the finished coin.
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Valued Member
United States
116 Posts |
Thank you Conder! I wasn't aware of how the process affected the blanks and planchet. That is helpful information!
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New Member
United States
9 Posts |
I have types 1 and 2 for all denominations from the Indian Head to the Presidential dollar. Also have half the silver ones simce the 1870s. Type 1 of those very hard. I would be happy to show photos if,anyone is interested. |
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Pillar of the Community
United States
3324 Posts |
Quote:I have types 1 and 2 for all denominations from the Indian Head to the Presidential dollar. Also have half the silver ones since the 1870s. Type 1 of those very hard. I would be happy to show photos if, anyone is interested. Put me down as VERY interested! "Nummi rari mira sunt, si sumptus ferre potes." - Christophorus filius Scotiae
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Bedrock of the Community
United States
12835 Posts |
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Replies: 28 / Views: 25,058 |
First Page
Posted 02/08/2018 04:55 am
