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<p>[QUOTE="Kasia, post: 3418041, member: 31533"]Basically mass production and fatigue of the die. Rather than cracking with excessive use, the features of the plated surface of the working die becomes very weak (think like metal fatigue) and rapid deterioration can happen, dramatically changing the sharper features to not. So you will see the mushiness, etc. Also features seem to lose their ability to strike cleanly and the extreme DDD or mechanical type of machine doubling either occurs or this is not necessarily MD, but DDD that kind of mimics it, I'm not sure. Anyways, a working die is originally a cylinder that has a raised point at the center so with extreme fatigue I think you can expect metal flow lines radiating and I think the deterioration wear follows flow lines. Check this out: <a href="http://www.error-ref.com/radial-flow-lines/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.error-ref.com/radial-flow-lines/" rel="nofollow">http://www.error-ref.com/radial-flow-lines/</a></p><p><i><br /></i></p><p><i><br /></i></p><p><i></i>[/QUOTE]</p><p><br /></p>
[QUOTE="Kasia, post: 3418041, member: 31533"]Basically mass production and fatigue of the die. Rather than cracking with excessive use, the features of the plated surface of the working die becomes very weak (think like metal fatigue) and rapid deterioration can happen, dramatically changing the sharper features to not. So you will see the mushiness, etc. Also features seem to lose their ability to strike cleanly and the extreme DDD or mechanical type of machine doubling either occurs or this is not necessarily MD, but DDD that kind of mimics it, I'm not sure. Anyways, a working die is originally a cylinder that has a raised point at the center so with extreme fatigue I think you can expect metal flow lines radiating and I think the deterioration wear follows flow lines. Check this out: [url]http://www.error-ref.com/radial-flow-lines/[/url] [I] [/I][/QUOTE]
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