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The attachment (cone crusher wear profile.pdf) shows a before/after profile of wear parts from a cone crusher. The light line is the original profile. The bold line is the worn profile. The phantom shows the worn liner profile where it would have been positioned in the crusher just prior to removal. The mantle displays a typical wear pattern that leaves a 'dish' in the parallel zone of the mantle just above the very bottom and a portion of the very bottom that does not wear as much.The resulting worn part has a bell shaped profile. I see this a lot on almost all worn mantles and consider this normal and there are no particularly bad negative side effects in most cases. But a) why does the bottom of the mantle not wear out and b) what can be done to the 'new' profile to prevent this from happening?