||Over Size Hole
||Lip angles are not equal. Lip Lengths unequal.
||Regrinding the Drill point to correct lip angle with proper relief, marinating Lip lengths equal
||Buckling of theDril
||Drill deflects axially
||Use Correct Guide Bush
||Hard, Tough work Piece, Torsion deflection of the Drill
||Increase Torsion Stiffness by replacing thicker Web Drill. Reduce Drill Length and Shorten flute Length.
||Fixture not rigid, Web Thickness more, Speed and Feed not Proper
||Use Rigid Fixture, Web Thinning to be implemented, Use proper speed and feed according to work material
||Drill Breaking in deep hole Drilling
||Chips blocking in Flutes, No informed back Taper, Drill Run out on OD
||Use Wood Packing System Before using check uniform back taper and concentricity
||No proper relief on Point, No uniform back Taper
||Regrind point with proper point relief, Check uniform Back Taper, add no point negative back Taper should occur on Drill Diameter.
||Heat Generation while Drilling
||Coolant insufficient Proper. Coolant not used, Work Piece is hard.
||Use Proper Coolant flow. Use Proper Coolant. Select Drill with Correct Geometry for the material