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Die Breakdown. What causes the marks you see on coins?
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<p>[QUOTE="GDJMSP, post: 1588251, member: 112"]That die shows something that I have tried to explain a thousand times and few seem to understand, or be willing to believe. But this is a perfect illustration of it. </p><p><br /></p><p>Before I start I want it understood that the method used to polish these token dies, while similar, is not exactly the same as that done mints like the US Mint. Folks making these token dies just aren't going to be as careful as they are at the mint. And their polishing disk is not as big in diameter as the one used at the mint. Also, it appears that the polishing of this die was done while the die was being held by hand. At the mint, the dies are held in a press, kind of like a drill press. So the die can be held perfectly steady and lowered down onto the polishing disk.</p><p><br /></p><p>Anyway, look at the picture. The areas I have circled in red, those are what die polish lines look like on a die. See how the die polish lines are all parallel to each other and do not criss-cross - anywhere ? That's because it is impossible for them to criss-cross because of the nature of what happens when a larger spinning disk and a smaller, stationary die is held against that disk. Yes, the disk can create lines on the die. But all of the lines will be parallel and in a slight arc. The size of the arc is dictated by the size of the disk. In other words, the larger the disk then the larger the arc will be. And with a large disk like that used by the mint, the lines that are actually arced will almost appear to be straight. Conversely, the smaller the disk, then the more arced the lines will appear.</p><p><br /></p><p>[ATTACH]220935.vB[/ATTACH]</p><p><br /></p><p><br /></p><p>Now the area I have circled in blue, look at it. And then allow your eyes to move down towards the bottom of the die. In this area where the person polishing this die only held the bottom half of the die against the polishing disk. That is why you can see the die polish lines diverge, in two different arcs going in opposite directions. And that is the only reason those lines in that area cross each other. Otherwise, it cannot happen.</p><p><br /></p><p>Now all of those lines around the outer edge of the die - those are not die polish lines. That is damage that was done to the die, probably by somebody with a piece of sandpaper or steel wool. Somebody was probably trying to clean the die up or remove rust. </p><p><br /></p><p>The point is, this picture illustrates why die polish lines on coins cannot criss-cross. If lines on a coin criss-cross, then they were caused by something else besides die polishing. They can be tool marks or scratches when they criss-cross, and they may well cross real die polish lines.[/QUOTE]</p><p><br /></p>
[QUOTE="GDJMSP, post: 1588251, member: 112"]That die shows something that I have tried to explain a thousand times and few seem to understand, or be willing to believe. But this is a perfect illustration of it. Before I start I want it understood that the method used to polish these token dies, while similar, is not exactly the same as that done mints like the US Mint. Folks making these token dies just aren't going to be as careful as they are at the mint. And their polishing disk is not as big in diameter as the one used at the mint. Also, it appears that the polishing of this die was done while the die was being held by hand. At the mint, the dies are held in a press, kind of like a drill press. So the die can be held perfectly steady and lowered down onto the polishing disk. Anyway, look at the picture. The areas I have circled in red, those are what die polish lines look like on a die. See how the die polish lines are all parallel to each other and do not criss-cross - anywhere ? That's because it is impossible for them to criss-cross because of the nature of what happens when a larger spinning disk and a smaller, stationary die is held against that disk. Yes, the disk can create lines on the die. But all of the lines will be parallel and in a slight arc. The size of the arc is dictated by the size of the disk. In other words, the larger the disk then the larger the arc will be. And with a large disk like that used by the mint, the lines that are actually arced will almost appear to be straight. Conversely, the smaller the disk, then the more arced the lines will appear. [ATTACH]220935.vB[/ATTACH] Now the area I have circled in blue, look at it. And then allow your eyes to move down towards the bottom of the die. In this area where the person polishing this die only held the bottom half of the die against the polishing disk. That is why you can see the die polish lines diverge, in two different arcs going in opposite directions. And that is the only reason those lines in that area cross each other. Otherwise, it cannot happen. Now all of those lines around the outer edge of the die - those are not die polish lines. That is damage that was done to the die, probably by somebody with a piece of sandpaper or steel wool. Somebody was probably trying to clean the die up or remove rust. The point is, this picture illustrates why die polish lines on coins cannot criss-cross. If lines on a coin criss-cross, then they were caused by something else besides die polishing. They can be tool marks or scratches when they criss-cross, and they may well cross real die polish lines.[/QUOTE]
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