1983 Kennedy Half Missing Hair - Not Accent Etc. Grease? - Page 2

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Author	Replies: 21 / Views: 3,793	Page: of 2

Slamnbass Pillar of the Community United States 3644 Posts	Posted 10/06/2015 9:09 pm Ive read quite a bit past couple years but where I learned about grease errors,die deteriation and over polished dies was right here from this forum and I still have plenty to learn from them if you stick around you will too Report this Post to the Staff
biokemist6 Bedrock of the Community United States 12437 Posts	Posted 10/07/2015 02:00 am Quote: Is there available any information on the exact striking pressure used by the mint? Van Allen and Mallis list the striking pressure for a Morgan dollar at 150 tons and I think I have seen the striking pressure for a Lincoln Cent listed at 25 tons with all other denominations in between. Report this Post to the Staff
Pete2226 Pillar of the Community United States 3330 Posts	Posted 10/07/2015 08:28 am Thank you, biokemist6. Report this Post to the Staff
coop Bedrock of the Community United States 62064 Posts	Posted 10/07/2015 12:13 pm Here is an image from a plate off a machine in SF mint for creating dies from the hubs. (probably proof settings) Edited by coop 10/07/2015 12:14 pm Report this Post to the Staff
Pete2226 Pillar of the Community United States 3330 Posts	Posted 10/07/2015 1:22 pm Quote: (probably proof settings) Please pardon my ignorance...would dies to mint proofs be different in composition than dies to make business strikes? The research I am doing for a paper on another subject identified only 2 different compositions for the steel in dies: Alloy 52100 for small diameter coins and Alloy L6 for quarter on up. My research did not uncover any difference between dies for proof strike and dies for business strike. That doesn't mean it doesn't exist though! I would be interested in where I might find more information on this question? Report this Post to the Staff
coop Bedrock of the Community United States 62064 Posts	Posted 10/07/2015 1:40 pm This was an image someone took at the SF mint on a machine. That about all I can tell you right now. Report this Post to the Staff
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