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â–  SPOTTING DRILL RECOMMENDATIONS

SPOTTINGDRILLRECOMMENDATIONS FOR SOLID CARBIDE AND QWIK TWIST DRILLS

Spotting Drill Point Angle

BEST Spotting drill angle is greater than the drill point angle. •First contact is at the drill point. •Best drill centering possibility. •Drill loading increases with penetration.

Drill Point Angle Spotting Drill Point Angle

ACCEPT ABLE Spotting drill angle is the same as the drill point angle. •Tool loading proble m s can occur due to i mm ediate full engage m ent.•Chatter m ay be a proble m .•Reduced feed at entry reco

Drill Point Angle

mm ended.•Good drill centering.

Spotting Drill Point Angle

NOT RECOMMENDED WITH CARBIDE Spotting drill angle is less than the drill point angle. •Point contact along cutting lips or corner - drill point should contact spotted hole first..•Chipping likely in these areas.

Drill Point Angle

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