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Definition of relief in industrial cutting: the surface behind the cutting edge that prevents the body of the knife from rubbing on the cut surface.

Definition of runout in industrial blade measurement: the total indicated reading (TIR) of the knife as it rotates on a spindle, and how runout affects cut quality.

Definition of secondary bevel in industrial cutting: a smaller angled face behind the primary bevel, used to add strength without sacrificing hone.

Definition of side clearance (also called side relief or lateral clearance) in industrial cutting: the angle that lets the substrate separate from the knife after the cut, on circular and rectangular slitter blades.

Definition of spark-out in industrial blade grinding: the final pass at zero infeed that removes residual stress and produces a stable surface finish.

Definition of surface roughness (Ra) in industrial blade measurement: the arithmetic average of the absolute deviations of the surface profile from the mean, and the typical Ra targets for slitter and shear blades.