TurningMillingDrillingTechnicalInformationIndex General turning Chip breaker overview Positive inserts A Roughing HR P K Single sided chip breaker with positive rake angle and stable cutting edge for light to medium roughing of steel and cast iron. B SNR S M Single sided chip breaker for roughing. Wide range of application due to excellent balance of sharpness and cutting edge stability. Basic P K C Single sided chip breaker with encircling cutting edge for universal machining of steel and cast iron. Aluminium machining LC N D Single sided chip breaker with excellent cutting edge design. Sharp cutting edge with positive rake angle. G-tolerance for high repeatability. LH N E Single sided chipbreaker for machining of cast aluminium alloys. Sharp cutting edge with positive rake angle. G-tolerance for high repeatability. A 24