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| PROBLEM | CAUSES | SOLUTIONS |
| CHIPPING OR BREAKAGE | Poor chip evacuation due to insufficient coolant pressure and/or volume | Increase coolant flow |
| Deflection | Reduce overhang | |
| Misalignment | Check concentricity not to exceed +/- .005 tir | |
| Speed too slow, feed too light | Increase speed and/or feed | |
| Wrong chipbreaker geometry | Use stronger chipbreaker (3P) | |
| CORNER OF INSIDE INSERT CHIPS AT CENTER | High cutting force at center of drill | Use tougher grade or uncoated grade in inside position |
| LOUD, ROUGH CUTTING | Excessive thrust force | Reduce feed, increase speed |
| Re-cutting chip | Increase coolant flow | |
| LONG UNBROKEN CHIP | Insufficient coolant pressure and volume | Increase coolant flow |
| Feed rate too light | Increase feed | |
| Wrong chipbreaker geometry | Use more positive geometry: (1P) | |
| CHATTER | Vibration | Check setup and part rigidity |
| Poor chip control | Increase coolant flow | |
| Drill not properly seated in holder | Check set-up | |
| HOLE SIZE TOO LARGE | Drill misaligned | Correct misalignment |
| FRACTURING OF DRILL | Improper seating of inserts | Check insert seating |
| Unstable spindle | Use rigid machine | |
| Insufficient horsepower | Reduce feed or change machines | |
| Excessive thrust force | Reduce feed | |
| SHORT TOOL LIFE | Excessive insert wear | Lower cutting speed or change grade |
| Lack of rigidity | Check set-up and spindle | |
| Improper coolant | Check type of coolant and mixture |
