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<p>[QUOTE=&quot;Conder101, post: 1122626, member: 66&quot;]Another, and very important, reason why todays coins are lacking in relief is because of the speed at which they are made.&nbsp; When a coin is struck the metal has to cold flow into the recesses of the die and this takes a certain amount of time.&nbsp; You can get it to flow faster by increasing the pressure but only up to a certain point.&nbsp; back when we had higher relief coins the striking speed was around 60 to 100 coins per minute.&nbsp; There are seven steps to each striking cycle so at 60 coins per minute, one per second, the actual time of the striking and metal flow is&nbsp; .14 seconds.&nbsp; Today the presses are running at 750 coins per minute or 12.5 coins per second.&nbsp; So the actual striking and metal flow time is .011 seconds.&nbsp; Increasing the pressure is not going to make the metal flow 14 times faster (and it is going to break your dies) so the only answer is to make it so the metal doesn&#039;t have to flow as far.&nbsp; You reduce the relief&nbsp; of the coins.&nbsp; With todays high speed presses it is impossible to create a higher relief coin.&nbsp; Now the collector type coins are another matter.&nbsp; Production quantities are low enough on those to be struck on the slower presses and still retain a high relief.[/QUOTE]</p><p><br /></p>

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