Drill Doctor 750X - Manual (Page 5)

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Identifying Basic Drill Bits
The Drill Doctor is most efficient when used to sharpen 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 and offer you an ability to
customize your point:
Standard Point
This general-purpose point is
used for drilling softer mate-
rials like cold rolled steel,
aluminum, and wood.
Split Point
Split-point bits are self-cen-
tering and are generally used
for tempered steels, hard
alloys or hard cast materials.
Anatomy of a Drill Bit
Chisel Edge
It is important to understand
that each bit has a all of
these characteristics.
Cutting Edge
Heel Relief
Angle
When viewing a well-sharp-
ened bit from the end, the
entire surface from the Cut-
ting Edge to the Heel will
have a finely ground surface
without ridges or indenta-
tions. The Heel will always
be lower than the Cutting
Edge.
Cutting Edge
Heel
Masonry Bits
Masonry bits have a carbide
insert at the point and are
used for drilling materials
like cement, brick, and
ceramic.
The Drill Doctor ® Sharpening Process
The sharpening process includes 4 easy procedures:
1. Determine the type and angle of the drill bit.
2. Align the bit in the Chuck.
3. Sharpen the bit.
4. Split the point (if you choose).
Be sure to complete the first three procedures in
order to sharpen a bit; and always sharpen a bit prior
to splitting it.
On the Model 500X
Check your drill bit angle
Most bits are 118° or 135°.
Hold your bit point up to the
key to the left to see which
type your bit looks like. If you
can’t tell due to small size or
damage on the tip, set your
Drill Doctor based on the
application. Most wood and
soft metal applications
should use 118 degree. Hard-
er materials such as stainless
steel and tool steel should
use 135° or if you are drilling contoured materials such a
car fender and plan on splitting the point.
Choosing Your Drill Bit Point Angle
When drilling into certain difficult materials, a shallower
point or 135° point angle produces a better-finished hole.
Your Drill Doctor allows you to sharpen bits with either
the standard 118°or the flatter 135° point angle. You can
also adjust the “chisel and relief angle.” (Refer to page 19
for the benefits of using Variable Alignment to adjust the
Chisel and Relief angles.)
Depending on the material you are drilling in, you may
choose to increase or decrease these angles.
1.