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Grit Tube Attachment
The Grit Tube attachment
is designed to keep any
sparks caused by sharpen-
ing safely inside the
machine and away from
you. In addition, the Grit
Tube reduces the sharpen-
ing dust in the air and on
your workbench.
Simply insert the Grit Tube into the Splitting Port of your
Drill Doctor when sharpening. It will catch the grit that is
formed from the sharpening process. Clean the inside of
your Drill Doctor and the Grit Tube on a regular schedule.
The grit tube is designed to accept a standard 1” shop vac-
uum for extended periods of sharpening.
Sharpening Bits of Different Lengths,
Diameters, and Types
Drill Bits Of Different Sizes
Too many rotations of a small-diameter bit may result in
incorrect sharpening and too few on a large bit may not
sharpen enough. Continue to sharpen until the Chisel
Edge is clean and straight and the entire surface from the
Cutting Edges to the Heel is finely ground.
• 3/32-inch bits—use 2 to 4 half-turns,
• 1/8-inch bits—use 4 to 6 half-turns,
• 3/8-inch bits—use 16 to 20 half-turns.
Large Drill Bits
The Model 500X sharpens bits from 3/32” to 1/2”. (You
can also purchase a Large Bit Chuck that sharpens bits up
to 3/4”.) The Model 750X comes equipped with that
Large-Bit Chuck. It sharpens bits from 3/32 to 3/4 inches.
Large bits are sharpened just like any other bit.
It is important to sharpen these bits so that the entire face
of the drill bit is sharpened. A large bit requires more
pressure and will require more half-turns to sharpen it.
Short Drill Bits and Bits Smaller than 1/8”
Set the point angle for 118°. Put the bit in the Chuck as
normal, but tighten Chuck so that it is just snug enough
for the bit to move freely. Push and hold the Alignment
Button. Partially insert the Chuck in the Alignment Port,
but do not push the Chuck all the way in. Use the Chuck
Knob to rotate the bit until it can be held by the Bit Clamp
Arms in the narrowest width of the bit. Make sure that the
bit is touching the Drill Stop, then release the Alignment
Button. Turn the Chuck until the Alignment Guide on the
Chuck aligns with the 118º notch on the Alignment Port.
Now, push the Chuck the rest of the way in. Tighten the
Chuck, remove, and tighten again.
Sharpen the small bit as usual.
Aligning and Sharpening Masonry Drill Bits
To sharpen a masonry bit, you do not turn the Chuck.
Instead you insert the Chuck until it touches the wheel,
remove, and repeat on the other side.
1.
Set the point
angle to 118°.
Bits 1/2” or larger will need a minimum of 40 half turns. A
3/4” bit may require up to 60 half turns. It may take two
or three complete sharpenings (repeat all steps) to re-
sharpen a very dull or chipped large drill bit.
Your Drill Doctor is delivered with a 180-grit Diamond
Sharpening Wheel. If you regularly sharpen larger bits
between 1/2” and 3/4”, you may wish to purchase the
coarser 100-grit Diamond Sharpening Wheel, which
sharpens larger bits faster.