Aligning And Sharpening Masonry Drill Bits - DRILL DOCTOR 350X Mode D'emploi

Large Drill Bits
Large drill bits (3/8" to 1/2") will require more half-turns
of the Chuck. A well-sharpened bit will have a smooth sur-
face from Cutting Edge to Heel. It may take two or three
complete sharpenings (repeat all steps) to re-sharpen a
very dull or chipped large drill bit. A 1/2" bit will need a
minimum of 20 half-turns.
Short Drill Bits
The new Chuck design on the 350X enables you to sharp-
en short bits as easily as longer ones. Simply align the bit
in the Chuck as normal. Then sharpen the bit using very
light pressure and fewer half-turns. The bit should only
briefly contact the Sharpening Wheel. Note that it is OK
for the Chuck Fingers to come into contact with the
Sharpening Wheel. This will not damage the Chuck.
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. Chuck the masonry bit.
Insert your masonry bit in the
Chuck in the same manner as
other bits, but in this case,
make sure the carbide insert is
touching the end of the Align-
ment Fingers as shown.
Alignment Finger
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Carbide
Insert
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2.
3.
White Triangle
Cam Guide
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Tighten
Tighten the Chuck while
checking that the insert is
touching the end of the Align-
ment Fingers. Tighten until
the bit no longer moves in the
chuck
Plunge until sharp.
Align the White Triangle on
the Chuck with the Cam
Guide on the machine.
Plunge the Chuck into the
Sharpening Port until it con-
tacts the Sharpening Wheel.
Remove the Chuck and rotate
one half-turn to the opposite
White Triangle. Plunge the
Chuck into the Sharpening
Port again to sharpen the
other side of the carbide
insert. Start with four
plunges. Inspect the bit.
Then sharpen more if needed.
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