| Author |
Replies: 31 / Views: 17,232 |
Page 3 of 3
|
|
|
|
Pillar of the Community
Canada
6244 Posts |
If proof you has a good beer for 3-4K.
|
|
Pillar of the Community
 United States
8939 Posts |
Quote: Damage I sold the last propriety in state and now till summer (when I will buy a new one in Texas,) been in Canada I can not obtain no documentation from the mint.
The problem with the matte could occur in many ways. Me I thing because it is a balance of the cost of the production and stay in - OR : 1): Purge melt and Krinos cool, or 2). In the annealing.
Your studies are supper from my point of view. Question: do it is only the strike?  Quote: I do not contradicted you but I put in question 300 tones strike. This are mean the mint prepared special collars, why? I can strike 3 time at 90 and have same result. That is NOT true at all. 3 strikes at 90 are still less than one at 300. Just because 3x90 is 270 does not mean that that "270" total would be equal to a single strike at 270. Quote: I have a 1994P or 1997P penny. How I can say it is matte or not? just by rim? It's not. Proof is a method of manufacture, not condition. Matte proof dies were carefully selected and sandblasted and used specially prepared planchets.
|
|
Bedrock of the Community
 United States
62064 Posts |
Edited by coop 04/26/2021 10:59 am
|
|
Pillar of the Community
Canada
6244 Posts |
Thank you COOP, now I understand. your encyclopedia clear my mind.
To answer to those which think the mint will strike at 200 or more tones. If you strike the 200 tones the collar must resist 265 and more tones. The forces go lateral make press the margins. This it is the most simply physic of forces and materials resistance. If I take the penny for example. It is copper alloy. If you press at 200 tones and more the crystalline structure will broke. For the reason of the material resistance also in this days the proof are strike 2-3 time.
You guys talk about a strike which the collar take. What material will use the mint to resist at this forces? they change the alloys because was to expensive, but in same time will use noble metals for collars to be able to strike?
|
|
Bedrock of the Community
 United States
62064 Posts |
I've seen images of the hub process. It looks real heavy duty: 
|
|
Pillar of the Community
Canada
6244 Posts |
Yes is heavy duty. But the margins? It is steel, which has his own proprieties. Even if you enforce with Ir or Ca (iridium or cadmium) will not resist for 750 strike a minute and 150 K strikes. The collar take the forces and go millions. You change the anvil and the hammer, not the collar. This it is the processes. I was in the studies of and damage we do not find the high resistence then 120 tones at this rhythm and sequences.
|
|
Bedrock of the Community
 United States
62064 Posts |
The hub makes the dies. Its not so many coins a second. It is a press that creates the dies. Later they are tapered to the correct size. 
|
|
Pillar of the Community
Canada
6244 Posts |
Excellent photos. If you look the collar will be 2 to 3 mm.
|
|
Pillar of the Community
2145 Posts |
Grape - you really should stop making fun of @Silviosi - thought I read somewhere this was family friendly forum?
|
|
Pillar of the Community
Canada
6244 Posts |
@ Rothery thanks but believe me no one will make fun of me. Some times we has to joke also. the life is life. But believe me if someone is impolite or insult I will be the first to jump. I do 'it and I will do again, and this it is because if we do not respect others we do not respect ourselves. thanks Rothery
|
|
Pillar of the Community
 United States
8939 Posts |
Quote: Grape - you really should stop making fun of @Silviosi - thought I read somewhere this was family friendly forum? I'm 99% sure he understands I'm not trying to be mean. I've done my best to make that clear to him on an interpersonal level. Also, I know that if he really had an issue he'd have either come to me or one of the mods who would have contacted me. If it was a genuinely problematic behavior I would have stopped a while ago.
|
|
Pillar of the Community
Canada
6244 Posts |
@ GrapeCollects Do not worry. you state your opinion, me mine. the best thing of this it is that two opposed ideas and visions in general could end with the best inventions. I was the assistant of proff. dr. Johnson and argues all time. Resulted in one of the best treatment of the cancer. so for me argue, is normal an open windows to new things.
|
|
New Member
United States
5 Posts |
A good reference for Lincoln Cent matte proofs I use is: " Lincoln Cent Matte Proofs" by Kevin Flynn, 2009, with extensive contributions and bibliography. Another reference: "Matte Proof Lincoln Cents 1909-1917", by Leonard Albrecht, 1983. After 40 years collecting Lincoln Cents, I'm still a student of the series, learning new information regularly. There's always new information! The Lincoln Cent, being the most enduring coin series in U.S. history, is a humbling topic. Regarding multiple striking of Lincoln Cent matte proofs - I haven't seen definitive records. Multiple striking may well have been the practice. I just don't know. Reference pp. 18 -20 " Lincoln Cent Matte Proof Striking Characteristics", with the Flynn text. Striking pressures, die preparation, planchet heating, collar placement etc. are all discussed. I find no mention of multiple striking. But that doesn't mean it wasn't the practice. Absence of evidence doesn't mean evidence of absence! Regarding the recent posting of the 1916 Lincoln Cent - refer to Flynn, pp. 19, 61-2, 90-1. The 1916 cent is generally found with the spectacular strikes, exhibiting full device and beard detail - some of the 1916 business strikes almost rival the matte proofs. Much improvement over the quality of the immediately preceding years. The 1916 cent is first in strong striking characteristics of the matte proofs. Maybe the Philadelphia mint upgraded the dies and upped the hydraulic striking pressures for the 1916 cent? The die diagnostics with the 1916 matte proof cent are subtle and I couldn't identify any clues from the posted photo. Profession certification is essential.
|
|
Valued Member
206 Posts |
|
|
Bedrock of the Community
 United States
62064 Posts |
Edited by coop 04/26/2021 1:02 pm
|
|
Page 3 of 3
|
Replies: 31 / Views: 17,232 |
Page 3 of 3
|