Difference between new and worn cavity
Let’s look at this through the images below. These show a cross-section of crusher liners under two conditions: on the left a new profile without any wear and on the right, the same profile worn in use. Thicknesses in the worn profile indicate a utilization rate of over 50%, so we can estimate that it was removed at the right time. Note that both profiles keep the CSS (close side setting) at 40 mm, but we can see that the top size of 112 mm is located outside the crushing zone in the worn profile, and the the worn cavity measures 84 mm.