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Pillar of the Community
United States
7123 Posts |
I guarantee you that there is a measurement for the depth of the devices on the dies and knowing that depth would /could make a whole new approach possible for determining die state .
right now we go by the amount of detail which is visable to us by whatever means is available , but knowing the elevation of certian points on a device could and would make the state of the die precisely known as well as determining the strike quality of just about any struck coin .
being a fellow Lincoln collector ,I know that these coins are often not fully struck even on new dies due to pressures and other failures of the process.
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Bedrock of the Community
 United States
19969 Posts |
Once again Metalman, great minds think alike! Do you have hidden surveillance system in my house? LOL
Lincoln Cent Lover!VERDI-CARE™ INVENTOR https://verdi.care/
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Pillar of the Community
United States
7123 Posts |
No ,no surveillence system just many of the same frustrations .
Im one of those guys with a few hundred rolls of MS-63 Lincoln cents , whats really sad is I find better ones in pocket change many times than what I get out of rolls , its strange but true .
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Pillar of the Community
United States
2600 Posts |
Thad, are you thinking that the relief would get higher (deeper) as the die wears? I don't see how the devises could get shallower with where. Just trying to see where you are going with this.
Jim
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Pillar of the Community
United States
869 Posts |
You could use a digital micrometer for measuring the heights of devices from a proof cent.
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Bedrock of the Community
United States
10982 Posts |
Quote:Does anyone know of a "topographic" map for wheats and LMC's? I'd like to know all the exact heights of all the devices. I've seen maps of Morgans with relative relief in Coin Values magazine. These were used by PCGS for grading. I'm sure someting similar is available for Lincolns. You might try the PCGS website or send an e-mail to Q. David Bowers at qdbarchive@metrocast.net. He wrote a great book on Lincolns and would know where to find something like this. |
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Bedrock of the Community
United States
19969 Posts |
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Bedrock of the Community
United States
19969 Posts |
Quote:
Thad, are you thinking that the relief would get higher (deeper) as the die wears? I don't see how the devises could get shallower with where. Just trying to see where you are going with this.
No, I'm thinking the opposite in a way. I believe the sides/edges of a die wear first. Think of the edges as knives that cut through the metal surface. The bottom of the die is more like a kettle, just a place for the metal to move into after being "cut". The machine presses are set to a defined, contant pressure for the stamping operation and then put to work. As the "knife edges" wear, the design starts to spread-out more and actually becomes lower in relief. Lincoln Cent Lover!VERDI-CARE™ INVENTOR https://verdi.care/
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Bedrock of the Community
United States
19969 Posts |
Quote:
You could use a digital micrometer for measuring the heights of devices from a proof cent.
That's part of my problem. It may take a laser based system because of the small size.  |
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Pillar of the Community
United States
7123 Posts |
Thad
if you know any one with CNC software , they maybe able to map a coin ,my suggestion would be several coins from each grade point to get an over all difference of how wear actually affects the die .
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Pillar of the Community
United States
860 Posts |
Thad, here is an academic article on doing such using SEM, sorry but they used a quarter, but easily done for any coin once set up. You might write the author and see if they did any other coins. Also I remember a Thesis by someone on computer coin grading where it was hypothesized that such relative measurements could be used to determine strike and wear, but I forget where I read it online. http://arxiv.org/pdf/cond-mat/9802139.pdfJim |
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Bedrock of the Community
United States
19969 Posts |
Quote:
Thad
if you know any one with CNC software , they maybe able to map a coin ,my suggestion would be several coins from each grade point to get an over all difference of how wear actually affects the die .
Hummm...actually, a friend of mine has a CNC machine. I'll ask him about it. Thanks Lincoln Cent Lover!VERDI-CARE™ INVENTOR https://verdi.care/
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Bedrock of the Community
United States
19969 Posts |
desertgem - Excellent paper! Thanks for the link!
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Valued Member
United States
227 Posts |
Just out of curiosity BadThad which shop do you go to here in Cincinnati?
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Bedrock of the Community
United States
19969 Posts |
Quote:
Just out of curiosity BadThad which shop do you go to here in Cincinnati?
You're in Cincy? COOL! I like Hyde Park Rare Coin. If you go there and see Clay, tell him Thad sent you. I also like their Fairfield store, but it's a long way from me. We also have the monthly show, last Sunday every of every month, it's a nice little show. |
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Posted 11/06/2008 6:33 pm
