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<p>[QUOTE=&quot;Oldhoopster, post: 3475536, member: 84179&quot;]From a process and metallurgy standpoint, I don&#039;t think a test mark is going to survive, even in the unlikely event the planchets were to make it to the minting process.</p><p><br /></p><p>I would expect the Rockwell test to be performed as part of an incoming inspection.&nbsp; In many production processes, incoming raw materials are sampled and taken to the lab.&nbsp; Once they have met all the testing criteria, the bulk shipment is released for production.&nbsp; Based on my experience in manufacturing, the test samples are discarded as written in the testing procedures.&nbsp; </p><p><br /></p><p>It makes no sense to use Rockwell as an in line process check.&nbsp; If you find a bad one, you&#039;ll have to shut down a high speed production line to remove them.&nbsp; It&#039;s a lot easier and cost effective to sample and test a lot prior to putting them in the production stream.</p><p><br /></p><p>I mentioned my thoughts on the metallurgy previously.&nbsp; [USER=77814]@Clawcoins[/USER] posted the mint used a 15T test, which is the 1/16&quot; ball.&nbsp; That&#039;s 62.5 thousandth s.&nbsp; Might the indent induce some localized work hardening? Maybe.&nbsp; I&#039;m not a metallurgist, but I would think it would be very small based on the size /depth of the indent.</p><p><br /></p><p>Based on manufacturing process control methods and testing it seems that for a Rockwell test piece to make it back into the process would be&nbsp; unlikely, and if one were to make it, there&#039;s a good chance, it wouldn&#039;t be recognizable.&nbsp; I think Fred&#039;s skepticism is warranted[/QUOTE]</p><p><br /></p>

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