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Problem	Solution
Wear on Outer Corners	Reduce cutting speed Increase feed (IPR) Improve coolant flow Add corner break Review and adjust alignment Check for proper drill clearance
Chipping of Cutting Lips	Reduce lip clearance Reduce feed rate
Margin Chipping	Review and adjust alignment Replace oversize bushing
Drill Breakage	Resharpen or replace drill Review and adjust alignment Review and adjust setup Check point geometry Check drill geometry (possible chip congestion)
Drill Splits Up Center	Check web thickness Reduce feed rate Check lip clearance
Drill will Not Enter Workpiece	Check lip clearance Check web thickness (web too heavy) Resharpen or replace drill Check drill rotation Check chisel edge angle (angle too high)
Oversize Hole	Resharpen or replace drill Check drill geometry (possible chip congestion) Review and adjust alignment
Rough Hole	Reduce feed Resharpen or replace drill Adjust coolant flow Check drill geometry (possible chip congestion) Check point geometry
Tang Breaks	Check socket for proper fit Check for nicks on shank Check for dirty sockets