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H8203 Professional Drill Sharpening Machine
The Model H8203 allows you to select a specific
point angle based on the type of material to be
drilled. For general purpose use, such as wood
and soft metal, set the point angle to 118º (see
Figure
16). Set the point angle at 135º or 140º for
drilling harder workpieces such as stainless steel,
or 90º-100
º for drilling soft cast iron workpieces.
To adjust the point angle:
1. Determine the point angle of your bit.
—If you want to grind the same angle that is
already on your bit, match the bit with one
shown in
Figure 16.
Figure 17. Point angle set to 118º.
Point
Angle
Scale
Setting Point Angle
Figure 16. Point angle examples.
—If you are not certain of the bit angle or
want to select a different point angle, base
the angle on the material softness or hard-
ness of your application.
2. Use the included hex wrench to loosen the
cap screw on the point angle scale (
Figure
17).
3. Turn the scale to the desired angle and tight-
en the cap screw.
118º135º 90º
Figure 19. Collet holder notch parallel to
grinding area flange.
Flange
Notch
Front Grinding Area
The grinding wheel adjusts the drill bit point angle
and taper relief angle in the front grinding area
(Figure 18).
To grind the point angle:
1. Make sure the grinding wheel cover is
secured, turn the machine
ON, and wait for
the machine to reach full speed.
2. Insert and rotate the collet holder into the
front grinding area so the notch on the collet
holder fits against the edge on the grinding
area flange, as shown in
Figure 19.
Figure 18. Drill bit point angle.
To reduce risk of fire or explosion from hot
metal or chips, do not operate machine near
flammable materials.