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3.
Set the depth
Set the depth by lining up the
Sharpening Guide with the Cam
Guide. Push the Chuck into the
Sharpening Port until it stops and
tighten the Chuck. Remove the
Chuck to ensure the carbide insert
is aligned with the
Masonry Sharpen-
ing Marks and
tighten again.
Using the Variable Alignment to Adjust
the Chisel and Relief Angles
Both Models 500X and 750X enable you to adjust the
Chisel and Relief Angles of your drill bit. The Chisel and
Relief Angles have a direct effect on the performance of
your drill. By increasing the Relief Angle, you can
increase the speed of the drill in softer materials. To
improve the quality of the hole you can adjust the drill to
be less aggressive. A less-aggressive drill has a lower
Chisel and Relief Angle. Your Drill Doctor enables you to
adjust both angles in one setting.
Chuck bit as usual
To prepare your bit for this
fine adjustment, follow all
the Steps for chucking your
bit given previously in this
User’s Guide.
1.
Insert Chuck into
Alignment Port
To adjust the Chisel and
Relief Angles, simply align
the bit as usual with the fol-
lowing adjustment;
To increase Relief—position
the Chuck in the Alignment
Port so that the Alignment
Guide is closer to the (+)
position. This will make a
more aggressive drill point.
To decrease Chisel and
Relief—position the Chuck in
the Alignment Port so that
the Alignment Guide is closer
to the (-) position. This will make a more precise hole.
Take care not to adjust Relief too far as this will actually
cause the drill to lose all Relief and therefore not drill a
hole. Each notch in the Alignment Port is approximately a
10° change in Chisel Angle.
2.
Alignment
Port
Sharpen by “plunging”
Line up the Sharpening Guide
on the Chuck with the Cam
Guide on the machine. Plunge
the Chuck into the Sharpening
Port until it touches the Sharp-
ening Wheel. Remove the
Chuck, rotate one half-turn
clockwise and repeat the plunge
action. Start with four plunges
and always use an even number.
Inspect the bit and continue until the cutting surfaces are
sharp. If the bit stops grinding before the edges are sharp,
loosen the Chuck, push the bit out slightly. Make sure car-
bide insert is still aligned with Masonry Sharpening
Marks. Tighten the Chuck, and continue sharpening.
2.
Align the bit with the Masonry
Sharpening Marks
Insert the bit into the Chuck and line
up the carbide insert on the tip of the
bit so that it is parallel to the Mason-
ry Sharpening Marks on the end of
the chuck. Leave about
1/2”-5/8” of bit stick-
ing out past the nose of
the chuck. Tighten the
chuck just to the point
that the bit slides in
and out.
Cam Guide
Cam
Sharpening Guide
Masonry
Sharpening Marks
4.
Cam
Guide
Cam
1”
118°
-
+
Carbide Insert