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Part 2 of the roller press 17th century
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<p>[QUOTE="2/3 thaler, post: 26129013, member: 170842"]<b>Is there a way to tell if a coin was rolled rather than pressed?</b></p><p><b><br /></b></p><p><b>The coin will have a slight bend (thick pieces) or wavy look to it (thin pieces) depending on the thickness of the strip of metal.</b></p><p><b><br /></b></p><p><b><br /></b></p><p><b>How widespread was the usage of this type of machine?</b></p><p><b><br /></b></p><p><b>By 1585 there were 13 known mints using this type of minting. Mints were in use in Germany, England, France, Austria, Slovakia, Romania, Switzerland and Poland. There were smaller mints also during this time. I guess you could them branch mints, as these mints had to get the ok by the Emperor to mint coinage.</b></p><p><b><br /></b></p><p><b>Oh, and these were strips rolled through at one long run, right? I wonder how they were then cut and separated?</b></p><p><b>There were trimming or punch machines. (I’ve included a pic of a punch press) The mint master would use shears to trim off any metal that trimming machines or punch press may not of remove. Also of note. When the mint warden would weigh the coins, if any coin was over weight, a file would be used to bring the weight of what the coin should be. When you see a coin with these file marks, it is call adjustment marks. It was a very common practice at that time.</b></p><p><b><br /></b></p><p><b>The process reminds me of the elongated penny machines that are still used. But when one is run through, it's...well, elongated. I wonder how this is avoided. Less pressure maybe?</b></p><p><b>The metal strip being used was flatten out to different thicknesses depending on what the coin was to weigh. These strips were also flatten out using a roller press. More pressure, the thinner the strip. The process would take a while as the pressure on the rollers had to be changed many times to get the strip to the thickness it needed to be. After the thickness of the strip was set, the hardest part in the minting process was over. All that needed to be done for the die press, was the set enough pressure to mint the blank.</b></p><p><b>Pic #1 is of a puch press used to punch the coin out of the strip. </b></p><p><br /></p><p><br /></p><p>[ATTACH=full]1667388[/ATTACH] </p><p><br /></p><p>[ATTACH=full]1667389[/ATTACH][/QUOTE]</p><p><br /></p>
[QUOTE="2/3 thaler, post: 26129013, member: 170842"][B]Is there a way to tell if a coin was rolled rather than pressed? The coin will have a slight bend (thick pieces) or wavy look to it (thin pieces) depending on the thickness of the strip of metal. How widespread was the usage of this type of machine? By 1585 there were 13 known mints using this type of minting. Mints were in use in Germany, England, France, Austria, Slovakia, Romania, Switzerland and Poland. There were smaller mints also during this time. I guess you could them branch mints, as these mints had to get the ok by the Emperor to mint coinage. Oh, and these were strips rolled through at one long run, right? I wonder how they were then cut and separated? There were trimming or punch machines. (I’ve included a pic of a punch press) The mint master would use shears to trim off any metal that trimming machines or punch press may not of remove. Also of note. When the mint warden would weigh the coins, if any coin was over weight, a file would be used to bring the weight of what the coin should be. When you see a coin with these file marks, it is call adjustment marks. It was a very common practice at that time. The process reminds me of the elongated penny machines that are still used. But when one is run through, it's...well, elongated. I wonder how this is avoided. Less pressure maybe? The metal strip being used was flatten out to different thicknesses depending on what the coin was to weigh. These strips were also flatten out using a roller press. More pressure, the thinner the strip. The process would take a while as the pressure on the rollers had to be changed many times to get the strip to the thickness it needed to be. After the thickness of the strip was set, the hardest part in the minting process was over. All that needed to be done for the die press, was the set enough pressure to mint the blank. Pic #1 is of a puch press used to punch the coin out of the strip. [/B] [ATTACH=full]1667388[/ATTACH] [ATTACH=full]1667389[/ATTACH][/QUOTE]
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Part 2 of the roller press 17th century
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