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Problem	Solution
Wear on Outer Corners	Reduce cutting speed Increase feed (IPR) Improve direction of coolant flow Increase coolant pressure Add corner break
Chipping of Chisel Edge	Check accuracy of drill runout Check workpiece clamping accuracy and movement Check point centrality and lip height Increase feed rate
Chipping of Cutting Lips	Check accuracy of drill runout Check workpiece clamping accuracy and movement Reduce speed Reduce point clearance Increase hone
Cracking of Lands	Check movement of workpiece Increase back taper Check accuracy of drill runout Chip pakcing; increase flute form opening or peck drill Slow down helix, horizontal drilling Increase feed When spot drilling, reduce feed Improve direction of coolant flow Increase coolant pressure
Oversize Hole	Increase speed, reduce feed Check workpiece clamping accuracy and movement Check accuracy of drill runout Chip packing, increase flute form opening or peck drill Check point centrality and lip height
Undersize Hole	Improve direction of coolant flow Reduce cutting speed, increase feed Check drill diameter
Hole Not Round	Check accuracy of drill runout Check workpiece clamping accuracy and movement Check point centrality and lip height Chip packing, increase flut form opening or peck drill
Drill Breakage	Chip packing, increase flute form opening or peck drill Check workpiece clamping accuracy and movement Check accuracy of drill runout Reduce feed rate, increase feed rate Improve direction of coolant flow Increase coolant pressure