Identifying Basic Drill Bits; Anatomy Of A Drill Bit - DRILL DOCTOR XP Mode D'emploi

Identifying Basic Drill Bits

The Drill Doctor® is most efficient when used to resharpen a drill
bit's original point angle. With its standard Diamond Sharpening
Wheel it will sharpen high-speed steel, cobalt, TiN-coated, carbide
and masonry drill bits. It has been designed and engineered to
sharpen three of the most common drill bit types:

Anatomy of a Drill Bit

Chisel Edge
Heel
Leading
Edge
Heel
Cutting Edge
44
Standard Point
This general-purpose point (normally
118°) is used for drilling softer
materials like cold rolled steel,
aluminum, and wood.
Split Point
Split-point bits are self-centering and
are generally used for tempered steels,
hard alloys or hard cast materials.
Masonry Bits
Masonry bits have a carbide insert
at the point and are used for drilling
materials like cement, brick, and
ceramic.
It is important to understand that each
Cutting
bit has all of these characteristics.
Edge
Relief
Angle
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".
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