TurningMillingDrillingTechnicalInformationIndex General turning Chip breaker overview Negative inserts A Medium machining TC K P Double sided chip breaker with surrounding cutting edge. Process reliable machining due to highest cutting edge stability. B NM S M Double sided chip breaker with ground cutting edge and large rake angle for medium machining of heat-resistant materials. EM M S C Double sided chip breaker with sharp cutting edge and large rake angle. Process reliable medium machining of stainless steel. EG M S D Double sided chip breaker with grinded cutting edge and large rake angle. Wide range of application for medium machining of stainless steel. Basic P K E Double sided chip breaker with surrounding cutting edge for universal machining of steel and cast iron. A 18