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Elliptical wear

An elliptical wear pattern on the upper or lower blade suggests extreme run-out of that blade. The run-out is caused by an inconsistent contact point between the upper and lower blade as the lower blade oscillates back and forth or up and down. All slitter blades have some level of run-out that contributes to blade wear. A small amount of run-out may be acceptable at slower speeds, but causes more aggressive blade wear at higher speeds.