Common signs include rough edges, incomplete cuts, increased pressure, material movement, uneven results across the cutting width, and visible nicks in the edge. First rule out a worn cutting surface, poor clamping, incorrect adjustment, or debris around the blade path. If approved sharpening is available, maintenance records should state how many times the blade has been serviced and whether its dimensions remain within specification. Continued use of a damaged edge can increase waste and place more strain on the machine. Stop operation when the blade shows cracking, loose mounting, or unexpected movement. Replacement should restore the original fit and cutting geometry rather than simply provide a sharper edge.