Don't See These Every Day, Unstruck Clad Ike Blank - Page 2

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Author	Replies: 23 / Views: 2,571	Page: of 2

mrwhatisit Pillar of the Community United States 2961 Posts	Posted 05/11/2022 07:37 am When the blanks get punched by the blanking machines, I would expect the nickel surfaces to get somewhat pushed down into the copper core from the pressure during blanking hence the irregular looking rim. It's a smooth rim since the collar with reeding had not struck the coin yet. This is how I understand it at least Report this Post to the Staff
Dearborn Moderator United States 97904 Posts	Posted 05/11/2022 08:00 am Quote: When the blanks get punched by the blanking machines, I would expect the nickel surfaces to get somewhat pushed down into the copper core from the pressure during blanking I agree completely. In fact someone here (Coop I think) had an illustration of this blanking process. Quote: It's a smooth rim since the collar with reeding had not struck the coin yet. Yep, you are correct. Collecting since 1972. Learning from then on "Tell me and I forget. Teach me and I remember. Involve me and I learn." - Benjamin Franklin 7070 type set coin count: 51/76 Uncirculated American Silver Eagles My American Silver Eagle Proof Collection Sacagawea Dollars Innovation Dollars Eisenhower-Dollars Kennedy-Half Dollars Washington-Quarters Roosevelt-Dimes Buffalo-Nickels 1938-2005 Jefferson-Nickels Lincoln-Cents Report this Post to the Staff
jbuck Moderator United States 189673 Posts	Posted 05/11/2022 08:59 am Looks legit to me. Coin Collector Since 1978 Avatar Old Avatar 7070 Eisenhower Australia Canada World CCF Members on eBay CCF eBay Search Engine Report this Post to the Staff
silviosi Pillar of the Community Canada 6244 Posts	Posted 05/11/2022 11:04 am Quote: When the blanks get punched by the blanking machines, I would expect the nickel surfaces to get somewhat pushed down Correct, but when the blanc is cut the Ni push down is always strait line and equal. the cutting blanc machine is 90 deg with a tolerance of the .05 deg., so the blanc sides are strait, which it is not the case of this example. Second: The blanc type I is bigger in diameter then the finish coins. Why, because the milling process will adjust the blanc to the normal dimension. If a blanc is to small 1.5 mm in diameter (this case). the blanc will pass the milling process without been touch by the rolls, and will pass the machine because will be push by the next blanc. Maybe COOP has the photo of the milling process or cutting machine to be understood by all. I know if we do not have the opportunity to see the minting process line is hard to understand and imagine exact how it is work. Other thing here it is the weight. At 1.5 mm smaller in diameter blank, this weight do not fit exactly with the normal clad planchet. Edited by silviosi 05/11/2022 11:06 am Report this Post to the Staff
coop Bedrock of the Community United States 62064 Posts	Posted 05/11/2022 11:36 am I have no image images of the process. But it is a dollar planchet. The reason it is smaller is during the striking process, the planchet is struck in the collar and the reeds are filled on the outside edges of the coin. (Becomes a coin at this point) So it is normal for it to be a slight amount smaller. Other wise if would not drop into the collar. But it is a normal planchet. (These are the most expensive ones as less coinage of these were struck) Common find is a Cent, Nickel, Dime and quarter planchets. Blanking process: Upsetup Process: Striking process: A few other references that I have that are not exactly what I need, but part of these show part of the processes to go through on making coins: CoopHome: What is involved in the process of making blanks/planchets/coins creating the process of cutting, upset and striking? Edited by coop 05/11/2022 11:44 am Report this Post to the Staff
HGK3 Pillar of the Community United States 575 Posts	Posted 05/11/2022 11:38 am Quote: Correct, but when the blanc is cut the Ni push down is always strait line and equal Not necessarily. Check out the photo of the edge of the dime planchet on the page below. There are two on the page, one pre upset mill and the second post upset mill. I'm referring to the post upset mill edge, which clearly shows an uneven copper/nickel line. https://www.error-ref.com/?s=blank Quote: Second: The blanc type I is bigger in diameter then the finish coins. I'm not sure that's accurate, but since this one has clearly been through the upset mill its not a type 1, but rather a type 2. The upset mill reduces the diameter of the type 1 blank slightly by compressing the edges to form the proto rim, hence the minor loss of diameter. Since the upset mill reduces the diameter of a planchet slightly due to compression and the collar has to have the exact inside diameter of the finished coin, there has to be a little expansion of the planchet when smashed with 50 tons of pressure. Report this Post to the Staff
coop Bedrock of the Community United States 62064 Posts	Posted 05/11/2022 11:47 am The blank/planchet may have been stored not in a holder to protect the edges. If this is a Eisenhower example, where has it been kept all this time. If not protected, it may have damaged the edges of the piece in question. Report this Post to the Staff
silviosi Pillar of the Community Canada 6244 Posts	Posted 05/11/2022 1:05 pm @HGK3 the dollars are struck at 120 tone. the smaller struck it is 60 tone for penny. The upset mill show by COOP show you clear the differences of the diameters. It is work like this. Just think of smaller (1.5 mm) diameter entering mill machine, no rolls will press in any ways. Coop has the best example for this process, me I have the engineering design for this machine which it is very technical and hard to understand if you do not work with. Report this Post to the Staff
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