Porter-Cable PCB575BG

TWIST DRILL BITS (FIG. Q)

Drill bits are best sharpened on a sharpening jig,

available at most hardware stores, but can be “dressed

up” on your grinder. Begin on one side of the point at

the existing angle, then twist the bit while maintaining a

constant angle with grinding surface. Sharpen only the

tip. This technique requires considerable practice, so

take your time and make a few “dry runs” ﬁrst with the

grinder off. Be sure to maintain the original cutting edge

angle as this is important to the efﬁciency of your bits.

One tool rest has a V-groove that is correctly angled for

most drill bits.

Fig. Q

LAWN MOWER BLADES

Lawn mower blades are usually sharpened on only

one side and dressed up slightly on the other. After

sharpening, be sure to balance the blade by removing

additional material from the heavy end. There are a

number of inexpensive cone balancers on the market

for this purpose. Unbalanced blades can cause serious

crank shaft damage to your lawn mower. Always remove

spark plug wires from the mower before servicing the

blades to prevent accidental starting.

DRESSING A GRINDING WHEEL (FIG. R)

A wheel dressing tool is provided with the grinder. Bring

the dressing tool forward on the tool rest until it touches

the high point on the face of the wheel. Dress the wheel

by moving the dressing tool back and forth. Repeat this

operation until the face of the grinding wheel is clean

and the corner of the wheel is square. NOTE: DO NOT

use the wheel dressing tool on wire wheels.

Fig. R

GENERAL OPERATION

Keep all bystanders a safe distance away from

the tool and not in direct line, front or back of the

grinder.

1. Your bench grinder has a medium wheel (60 grit)

for medium material removal and general purpose

grinding, and a coarse wheel (36 grit) for fast material

removal.

2. To operate the bench grinder, always wear safety

glasses and turn the tool on while standing at the side

and not in front of the grinder. Allow it to reach full

speed before grinding.

3. Hold the work piece ﬁrmly against the tool rest. Hold

very small pieces with pliers or other suitable clamps.

4. Feed the work piece smoothly and evenly into the

grinding wheel.

5. Move the work piece slowly and avoid jamming the

work piece against the wheel. If the wheel tends

to slow down from excessive force, you should

occasionally release the pressure to let the wheel

return to full speed.

6. Grind only on the face of the grinding wheel and

never the side of it. (Some wheels are designed

for side grinding and will say so on their blotters/

cardboard disc.)

Prolonged grinding will cause most materials

to become hot. Use care when handling such

materials.

SCISSORS

If possible, take the scissors apart to make the

sharpening operation easier and safer. Remove material

only from the outside surface and work from the heavy

end of the blade toward the tip.

KNIVES

Remove metal from both faces of most knives, working

from the heavy end of the blade toward the tip.

SCREWDRIVERS

The end of a properly sharpened screwdriver will be

a perfect rectangle, absolutely ﬂat and perpendicular

to the center line of the shank. The two sides and two

faces will taper outward from the edge of the shoulder

or shank. They should be ﬂat with intersecting faces

perpendicular. Hold each face of the screwdriver against

the wheel to true it up, then ease the end straight into

the stone to grind it true.

CAUTION