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<p>[QUOTE="calcol, post: 2711821, member: 77639"]I think we're pretty much in agreement about the definition of a hub. I'm not so sure dies could not have been created from hubs before the 19th century. Starting backward from the planchet, a die has to be of significantly tougher material than the planchet. If the planchet is hot silver or gold, the die could be bronze, and pounding the dies between a hammer and anvil would be enough force for striking a coin. For creating a die from a hub, the hub has to be of significantly tougher material than the die at the time the hub impresses the die material. Could the ancients harden an iron/steel hub sufficiently to create a die in a heated slug of bronze with the force from a slinging sledge hammer? I dunno, but they could certainly create bronze coins by slinging a sledge on (presumably iron) dies with a heated bronze planchet between them. So why couldn't they use an iron hub to create bronze dies?</p><p><br /></p><p>It's also possible that bronze dies could have been created by a casting molten bronze on to an iron "hub". However, I would not consider the process to be hubbing.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>
[QUOTE="calcol, post: 2711821, member: 77639"]I think we're pretty much in agreement about the definition of a hub. I'm not so sure dies could not have been created from hubs before the 19th century. Starting backward from the planchet, a die has to be of significantly tougher material than the planchet. If the planchet is hot silver or gold, the die could be bronze, and pounding the dies between a hammer and anvil would be enough force for striking a coin. For creating a die from a hub, the hub has to be of significantly tougher material than the die at the time the hub impresses the die material. Could the ancients harden an iron/steel hub sufficiently to create a die in a heated slug of bronze with the force from a slinging sledge hammer? I dunno, but they could certainly create bronze coins by slinging a sledge on (presumably iron) dies with a heated bronze planchet between them. So why couldn't they use an iron hub to create bronze dies? It's also possible that bronze dies could have been created by a casting molten bronze on to an iron "hub". However, I would not consider the process to be hubbing. Cal[/QUOTE]
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