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ww w.drilldoctor.com 15
The Drill Doctor® is most efficient when used to resharpen
a drill bit’s original point angle. With its standard 180° Grit
Diamond Sharpening Wheel it will sharpen high-speed steel,
cobalt, TiN-coated, carbide and masonry drill bits. Your Drill
Doctor® has been designed to sharpen the three most common
drill bit types:
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 (normally 135°) are
generally used for drilling into harder
materials, like 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.
Anatomy of a Drill Bit
When viewing a well-sharpened bit
from the side, the Heel will always be
lower than the Cutting Edge; this is
called “positive relief”.
Chisel Tip
Cutting
Edge
Relief
Angle
Leading
Edge
Heel
The Drill Doctor
®
Sharpening Process
The sharpening process includes 3 easy steps:
1. Align the bit in the Chuck.
2. Sharpen the bit (until there is no more grinding noise).
3. Split the point (optional on 118°, mandatory on 135°).
Be sure to complete each step to sharpen and split a bit and
always sharpen the bit prior to splitting it.
Identifying Basic Drill Bits
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