pro.point 8712135 User Manual page 17

V1.0 8 in. BENCH GRINDER WITH PCB LCD READOUT
Sharpening twist bits freehand will require considerable practice
and dry runs with the grinder OFF to acquire the skill of rotating
the bit while maintaining the original cutting edge angle.
1. Set the grooved tool rest horizontal to the face of the
grinding wheel.
2. Hold the drill shank between the thumb and index finger,
resting the back of the index finger on the tool rest.
3. Be sure that the cutting lip is straight across the face of the
wheel before beginning each stroke
4. When the drill contacts the wheel, push the drill shank
downward and to the left at a slight angle. At the same
time, rotate the drill so the other lip is just visible.
5. Repeat this process on the other lip to sharpen the entire
twist drill
Consider using a sharpening jig if you anticipate sharpening
numerous bits.
SHARPENING WOOD CHISELS & PLANE IRONS
Sharpening chisels and irons on the bench grinder will produce
razor sharp hollow ground bevels, which must be followed by
honing on a whetstone. Practice the steps below with the
power off before attempting to sharpen a chisel or plane iron.
1. The chisel cutting edge must be free of nicks and be 90° to
the chisel edge. With the tool rest flat, lightly dress the
cutting edge if nicks are present or it's out of square.
2. Adjust the tool rest's angle between 25 to 30 degrees in relation
to the grinding wheel's face. Rest the chisel on the angled tool
rest and move it laterally across the face of the wheel.
3. Occasionally cool the workpiece in water to maintain
its hardness.
4. Continue grinding the cutting edge and bevel until the
bevel length is roughly twice the thickness of the chisel.
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8712135
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