Relief Angle - DRILL DOCTOR XP Guia Del Usuario

3.
Cam
Cam Guide Sharpening Guide
Using the Variable Alignment to Adjust
the Chisel and Relief Angles
Model XP enables 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 increas-
ing 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 Angles. Your Drill Doc-
tor enables you to adjust both angles in one setting.
1.
Chisel
Cutting
Edge
Edge
Heel
Relief
Angle
18
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 Sharpening
Wheel. Remove the Chuck,
rotate one half-turn clock-
wise 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, tighten the Chuck,
and continue sharpening.
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.
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2.
–
+
118˚
3.
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Insert Chuck into
Alignment Port and
adjust bit poisiton
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.
Tighten Chuck, and
sharpen as usual
Refer to page 10 for these
Steps. Experiment with a few
different settings to find the
one that best suits your drill
bits and application. You may
find it helpful to mark this
setting for future use.
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