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Identifying Basic Drill Bits
The Drill Doctor is most efficient when used to sharpen the
original point angle of a drill bit. With the standard Diamond
Sharpening Wheel it will sharpen high-speed steel, cobalt, TiN-
coated, carbide and masonry drill bits.
The Model DDX
2 is designed and engineered to sharpen the most
common drill point types:
Standard Point
This general-purpose point (normally
118°) is used for drilling softer
materials like cold rolled steel,
aluminum, and wood.
Masonry Bits
Masonry bits have a carbide insert
at the point and are used for drilling
materials like cement, brick, and
ceramic.
Anatomy of a Drill Bit
It is important to understand that
each bit has a Chisel Edge, a Cutting
Edge, a Heel, a Relief Angle, and a
Leading Edge. (The Leading Edge will
be important in bit alignment.)
When viewing a well-sharpened bit
from the end, the entire surface from
the Cutting Edge to the Heel will have
a finely ground surface without ridges
or indentations. The Heel will always
be lower than the Cutting Edge; this is
called “positive relief”.
Chisel Edge
Cutting
Edge
Relief
Angle
Leading
Edge
Heel
Cutting Edge
Heel
