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        General Data

        Drill

        Nomenclature of Drill

        Nomenclature of Drill

        Machining formula

        Working of Main Angle
        Point Angle Torsional Angle Lip Relief Angle  

        Large → Tork → Small
        Small → Thrust → Large

        Bad → Cutting ability → Good
        Good → Chip emission → Bad
        Large → Tool toughness → Small

        Small → Tool wear → Large
        Small → Vibration → Large
        Point Angle Torsional Angle Lip Relief Angle

        • V : Cutting Speed
        • D : Diameter of drill
        • N : Revolution
        • π : (3.14)
        (m/min)
        (mm)
        (rpm)

        • f : Feed
        • S : Depth of cut per min
        • N : Revolution
        (mm/rev)
        (mm/min)
        (rpm)

        • δ : Helix angle
        • D : Diameter of drill
        • L : lead
        • π : (3.14)
        (mm)
        (mm)

        Drill Trouble Shooting

        Drill Trouble Shooting
        Trouble issue Cause Solution
        Drill does not enter the workpiece
        • Shortage of Lip Relief.
        • Thick the Web.
        • Regrinding to Lip Relief properly.
        • Thin down the Web.
        Margine chipping
        • Excessive Jig busing
        • Using the suitable busing for Drill size.
        Blance of cutting edge
        • Overheating the drill on work.
        • Reduce feed speed and supply with cutting oil sufficiently.
        Chipping of cutting edge
        • Excessive rake angle.
        • Excessive feed speed.
        • Modify for Lip Relief.
        • Reduce feed speed.
        Broken of tang
        • Imperfection of connect between Taper shank and socket
        • Remove to socket alien substance or change to socket if it wear
        Broken for brass work
        • Improper choice for Drill shape
        • blockage the chip on groove point
        • Choice to Drill properly
        Crack of Drill core
        • Shortage of Flute Clearance.
        • over feed speed
        • Regrinding to Drill proper rake angle.
        • Reduce feed speed.
        Over hole size
        • Edge of flue angle and cutting length is different.
        • Main shaft is loose
        • Choice for good quality Drill.
        • Tight up the Main shaft properly.
        Broken for Flute edge
        • Over cutting speed
        • Hard alien substance on workpiece
        • Shortage of Drill tip
        • Wear to Drill
        • Grinding for tip properly.
        • Reduce feed speed.
        • Regrinding.
        Irregular chip size
        • Edge of flue was wrong grinded or did work one
        • side of flute.
        • Need to regrinding accurately.
        • Choice for good quality drill.
        Rough hole
        • Edge of flute was grinded as blunt or improperly.
        • Unsupplied with cutting oil on Drill tip.
        • Over feed speed
        • Unsubstantial Tool holder.
        • Regrinding to edge of flute angle.
        • Supply with cutting oil properly.
        • Reduce feed speed.
        • Fix to Tool Holder solidly.