Identifying Basic Drill Bits; Anatomy Of A Drill Bit - Drill Master XP User Manual

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
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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.
When viewing a well-sharpened bit
Cutting
from the side, the Heel will always be
Edge
lower than the Cutting Edge; this is
called "positive relief".
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.
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