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<p>[QUOTE=&quot;Conder101, post: 803326, member: 66&quot;]Back years ago they didn&#039;t have the fancy high speed counting and rollng machines.&nbsp; Coins were counted manually by stacking them.&nbsp; Coins with high relief were unstable when stacked and tended to fall over requiring recounting, and sometimes knocking over other stacks in the process.&nbsp; Lower relief coins were more stable.</p><p><br /></p><p>Today the low relief is for a different reason, metal flow.&nbsp; Back in the early to late twentieth century, the rate at which the presses ran striking coins was around 60 cycles per minute or about one coin per second per die.&nbsp; During that one second seven operations occured.&nbsp; The dies came together, they opened up, the anvil die rose up pushing the coin out of the collar, the feed fingers puch the coin out, the anvil die retracts, a planchet is dropped into the coining chamber, and the feed fingers get out of the way.&nbsp; Call it .14 seconds for each step. Todays press runs 750 cycles per minute or about 12 coins per second.&nbsp; Now each of those steps has just .011 seconds to take place.&nbsp; With the old press the metal had .14 seconds to flow up into the die, today it only has .011 seconds.&nbsp; Now the metal will only flow a given distance in a given time no matter how hard you smack it.&nbsp; So as the time allowed for the strike declined the relief had to be lowered more and more because the metal just wouldn&#039;t flow far enough in the time allowed.[/QUOTE]</p><p><br /></p>

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