® Type of Chip Breakers MachiningMethod ChipBreaker Cutting Edge Cross-Section (Approximate) Application Land width Land width Rake Angle GL Rake Angle For milling stainless steel: a breaker with a large rake angle anda small flat land to reduce cutting force. Land width LLaannddwwididthth Rake Angle GM Land width RRaakkee AAnnggllee For milling various materials from steel to cast iron: a breakerLand widthLand widthRake AngleRake Anglewith a superior balance of rake angle and flat land. Rake Angle Land width Land width LLaannddwwididthth Rake Angle Land width RRaakkee AAnngglleeRake Angle For milling various materials from steel to cast iron: a highly GR Land widthLand width Rake AngleRake Angle rigid breaker with large rake angle and flat and to provide asharp cutting edge and enable efficient milling. Rake Angle Milling Land widthLand width Rake AngleRake Angle HR Land widthLand width RRaakkee AAnnggllee For milling high hardened steel: a breaker with sharpness andLand widthRake AngleRake Angleexcellent rigidity. Rake Angle Land width Rake Angle RRaakkee AAnnggllee Rake Angle Rake Angle For milling difficult materials: a breaker with a sharp cutting SM Rake Angle edge to reduce cutting force and provide smooth chip Land width Rake Angle evacuation. Rake Angle Rake Angle RRRaaakkkeee AAAnnngggllleee Rake Angle Rake Angle For milling non-ferrous materials: a breaker with a sharp cutting NM Land width Rake Angle edge and a large rake angle to suppress welding, improve the Rake Angle milling surface and prevent burrs. RRaakkee AAnnggllee Rake Angle Land width Rake Angle DM Land width RRaakkee AAnnggllee For drilling various materials from steel to cast iron: a generalRake Anglepurpose breaker with an ideal rake angle. Rake Angle Land width Rake Angle Holemaking DR Rake Angle For drilling cast iron: a highly rigid breaker with an optimal landwidth and rake angle. Land width Rake Angle Rake Angle DN For drilling non-ferrous materials: a breaker with a sharp cuttingedge and polish treatment for excellent chip evacuation. Rake Angle Rake Angle Rake Angle 1150 OSG PHOENIX® WWW.OSGTOOL.COM Rake Angle