Years 2005 - Now , Jefferson Nickel - Liberty Study - Page 2

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Author	Replies: 24 / Views: 2,224	Page: of 2

numidan Valued Member Canada 219 Posts	Posted 04/25/2023 9:43 pm Thank you Coop for your pictures. Doubled die on Reverse Here is what I have found for the reverse side. 2013-P DDR-003 reference: http://www.varietyvista.com/04d%20J...3PDDR003.htm I do not know what happened for this one! Maybe one of you have seen this kind of doubling. The whole right side of the building seems doubled (red arrow shows the doubling of door and small window under door) and the details are not sharp. There are metal ripples on the wall of the building. Reference coin vs coin in question This is the window to the right. Notice the concave depression after the edges of the walls. Edited by numidan 04/26/2023 07:45 am Report this Post to the Staff
numidan Valued Member Canada 219 Posts	Posted 04/26/2023 07:58 am The 2007 P in previous reply is still a mystery Doubled die on Obverse This is what I found in lot. 2005 D WDDO-001 reference: https://www2.briansvarietycoins.com...gs/view/1697 2008 P Doubling on left side of legend mostly visible on word "TRUST" The rest is doubling on the word Liberty sometimes affecting digits in year. 2011 D Strong doubling on letters "ber" Die state = Silvio's catergory 1b+ 2007 D Small doubling on letters "ber" and digits "200" Die state = Silvio's catergory 1b 2012 D Small doubling on letters "ber" and digits "201" Die state = Silvio's catergory 1b+ Edited by numidan 04/26/2023 08:00 am Report this Post to the Staff
numidan Valued Member Canada 219 Posts	Posted 04/26/2023 8:23 pm Die Clash on Reverse Here is what I have found. The most common die clash is the one on the side of building as shown in image below (Two areas I found highlighted in red). I have 11 coins with DC all having slightly different clash position. I only provided one picture of each DC type found. Note: Obverse picture was flipped for this montage. Edited by numidan 04/26/2023 8:27 pm Report this Post to the Staff
numidan Valued Member Canada 219 Posts	Posted 04/27/2023 09:12 am Incuse Doubling I never understood this type of deterioration but very easy to recognize. There is a concave depression outside the edges of the device. This type of error mostly seen on pennies, seldom seen on nickels. Trails Very noticeable lines extending from the corners of the letters "PLUR" There are other observations I have made but the few nickels I have, prevents me to reach an acceptable conclusion (ie. lack of steps on building, is it a one year problem or can be observed on other years). Hope this was as informative as it has been for me. There are noticeable differences between errors found on Canadian nickels and those found on American nickels within this time frame. I have enjoyed this exercise. Until I get more US nickels (between 2005-now) to search through, I will try to perform the finite element analysis (this is new to me!) to get a better understanding of stresses on the working die. Here is a preview of the 3D modelling phase. Edited by numidan 04/27/2023 09:17 am Report this Post to the Staff
numidan Valued Member Canada 219 Posts	Posted 05/10/2023 3:14 pm Update After 2 weeks into online course, the simulation process is harder than I thought! The student version of software is limited so I will not be able to simulate previous reply's 3D model :( In the course, it is mentioned that we can simplify a model to obtain meaningful results that can be extrapolated. So here is reduced version of Hub and Die colliding. You will notice the outer surface of die rod blank expanding during the hubbing process confirming what is seen in picture below. The simulation reports up to approximately 1.5mm diameter expansion. This might be the reason for some "play" between collar and Hub/Die. Sorry for small animation, CC will only allow 300k file size. source:https://www.coinnews.net/2013/09/13...oduce-coins/ Depending on the material used for the die rod blank, there could be some contraction as the piston is lifted. This depends on the elastic portion of stress-strain curve. Edited by numidan 05/10/2023 3:15 pm Report this Post to the Staff
silviosi Pillar of the Community Canada 6244 Posts	Posted 05/11/2023 12:04 am @ numidan I think your photo must be the working hub or perhaps the master Die. In my office I show you the really working Die how it is and the points. I just ask for my own clarification because produce Dies is Vertical squeeze and the coins struck is Horizontal. IMHO by the markers must be an Working Hub. Thanks. Report this Post to the Staff
numidan Valued Member Canada 219 Posts	Posted 05/11/2023 09:21 am Quote: I just ask for my own clarification No problem Silvio, always glad to clarify. Quote: In my office I show you the really working Die how it is and the points. Thank you for showing me the working die as it was the first time I could see one in person! Below is a picture showing the different stages of producing a working die. What you showed me was the hardened ("working") die ground as indicated by the blue arrow. I was working on the struck ("working") die as indicated by the red arrow. What could have been confusing is that I have not included the shoulder on the working die blank in this simulation but in the new simulation I am attempting, it is there as shown in image below. source:https://www.coinnews.net/2013/09/13...oduce-coins/ Report this Post to the Staff
numidan Valued Member Canada 219 Posts	Posted 05/16/2023 2:36 pm Here is an interesting find for 2005 D Ocean. I think that a piece of metal was stuck between the letters E and R on the hub producing the die as shown in the top picture. The force during the hubbing process made a mark of the outline of the piece of metal on the hub. When the piece of metal fell out, the following die(s) produced shows the mark where the piece of metal was as shown in the bottom picture. Report this Post to the Staff
numidan Valued Member Canada 219 Posts	Posted 05/18/2023 09:32 am At first I thought it was a new DDR but closer inspection it is a die clash. I am surprised at the amount of die clashes I find in the new rolls I purchased recently for the study! In the montage below, I have indicated with red arrows and numbers the marks left by Jefferson's nose as it is hard to get a good picture. Report this Post to the Staff
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