Six different classes
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Classification by:
Even if drills have the same geometry, they are classified differently, depending on a viewpoint.
Structure
Type:
Features:
Solid
Carbide
Brazed
type
Indexable
type
A drill that is made solely of cemented carbide.
A drill that has the cutting edge sec-tion (tip) brazed onto the drill body. The tip is generally cemented carbide.
A drill that uses indexable inserts as the cutting edges.
Length
Type:
Features:
Stub
L/D=2~3 drill
Regular
L/D=4~5 drill
Long
L/D>5 drill
Superlong
L/D>10 drill
Helix angle
Type:
Features:
Twist
A drill that has flutes twisted to the right or left hand to the drill axis.
Straight
A drill that has straight flutes.
Shank shape
Type:
Features:
Straight
Shank
A drill that is made solely of cemented carbide.
Taper
Shank
A drill that has the cutting edge sec-tion (tip) brazed onto the drill body. The tip is generally cemented carbide.
Material
Type:
Features:
High-speed
steel
A drill that is made of high-speed steel.
Turn difference
A drill that has the cutting edge section (tip) brazed onto the drill body. The tip is generally cemented carbide.
Coated
A drill that is coated with either
CVD or PVD coating
Solid
Carbide
A drill that is made solely from
cemented carbide.
Cross section geometry
Type:
Features:
With
coolant holes
A drill that has through coolant holes.
Strepped
A drill that can machine a hole with a chamfer in one operation.
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