Definition of rake angle (also called rake, top rake or cutting rake) in industrial cutting: the angle of the front face of the cutting edge measured from vertical, and how positive vs negative rake affects cutting force, chip flow and blade life.
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.