Edge damageToolholder, others Change to harder grade Change to tougher grade Vc fz Coolant discharge condition Chipbreaker review Inner edge's center height check (Core dia. check) Toolholder rigidity improvement (Short type) Workpiece / Tool installation Insert installation Offset check Adjustable sleeve usage Power, rigidity Technical information Trouble shooting Drilling (Magic Drill series) Check item Insert grades Cutting conditions Tool geometry Setting Machine Countermeasures Trouble Trouble item Higher (Larger) LargerLower (Smaller)Smaller Unsuitable cutting speed (too high) Unsuitable cutting speed (too low) Unsuitable coolant discharge Unusual wear Poor rigidity of machine / workpiece Small hole dia. *1 Unsuitable insert grade No core, too small core Poor rigidity of machine / workpiece Unstable drilling start Inner edge cracking High hardness workpiece Clogged chips Unstable insert installation Poor rigidity of machine / workpiece Unstable drilling start Outer edge cracking High hardness workpiece Poor chip control Unstable insert installation R Poor rigidity of machine / workpiece Scratches on tool body Inaccurate tool installment *1 Clogged chips Unstable drilling start Poor rigidity of machine / workpiece Poor rigidity of toolholder Inaccurate tool installment *1 Poor hole dia. accuracy / Surface finish Clogged chips Large core dia. Unstable drilling start Unsuitable coolant discharge Large vibration / chattering Unsuitable cutting conditions,installation Unsuitable cutting conditions Long chips Unsuitable chipbreaker Machine failure Lack of machine power *1. For lathe operation R39