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[ Nomenclature of Drill ]

MARGIN WIDTH
> Technical DataLIP HEIGHTPOINT ANGLE
LEAD
추천절삭조건표

CHISEL EDGE ANGLE
FLUTEWIDTH
DIAMETER
FLUTE HELIX
HEEL ANGLE
CHISEL EDGE
BODY CLEARANCE CUTTING FACE
BODY CLEARANCE DIAMETER
FLUTE LENGTH SHANK LENGTH
WEB THINNING
OVERALL LENGTH

CHISEL EDGE LENGTH

WEB THIKNESSS
WEB

[ Working of Main Angle ] HELIX ANGLE LIP RELIEF ANGLE

POINT ANGLE 7。 10。 12。 15。

70。 118。 140。 10。 38。 40。 Small → Tool Wear → Large
Small → Vibration → Large
Large → Torque → Small Bad → Cutting Capacity → Good
Small → Thrust → Large Good → Chip Ejection → Bad

Large → Rigidity of tool → Small

N ●Cutting Speed ●Feed
D
V = πx D x N (m/min) f = S (m/rev)

1000 N

• V : Cutting Speed (m/min) • f : Feed (mm/rev)
• D : Diameter of drill (mm) • S : Depth of cut per min (mm/min)
• N : Revolution (rpm) • N : Revolution (rpm)
• π : (3.14)

f ●Helix Angle

δ。= Tan-1 ( πD )

L

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

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