Ryobi P423, Operator'S Manual

Page: 10 / 36

10 — English
OPERATION
GRINDING WITH THE TOOL
See Figure 12, page 14.
Always carefully select and use grinding wheels that are
recommended for the material to be ground. Make sure
that the minimum operating speed of any accessory wheel
selected is 10,400 r/min. or more. The grinding wheel
provided with the tool is suitable for grinding welds, preparing
surfaces to be welded, grinding structural steel, and grinding
stainless steel.
To grind with the tool:

Secure all work in a vise or clamp to a workbench.
DANGER:
Never use the tool with the guard removed. It has been
designed for use only with the guard installed. Attempting
to use tool with guard removed will result in loose
particles being thrown against the operator resulting in
serious personal injury.

Remove the battery pack.

Install grinding wheel guard and grinding wheel.

Install the battery pack.

Hold the grinder in front and away from you with both
hands, keeping the grinding wheel clear of the workpiece.

Turn the tool ON and let the motor and grinding wheel
build up to full speed.

Lower the grinder gradually until the grinding wheel
contacts the workpiece.
WARNING:
To prevent loss of control and possible serious personal
injury, always operate the grinder with both hands,
keeping one hand on the side handle.
 Keep the grinder tilted at an angle from 5° to 15° and
continuously moving at a steady, consistent pace.
NOTICE:
If the grinder is held in one spot too long, it will gouge
and cut grooves in the workpiece. If the grinder is held
at too sharp an angle, it will also gouge the workpiece
because of concentration of pressure on a small area.

Use just enough pressure to keep the grinder from
chattering or bouncing.
NOTE:
Heavy pressure will decrease the grinder’s speed and
put a strain on the motor. Normally the weight of the tool
alone is adequate for most grinding jobs. Use light pressure
when grinding jagged edges or loose bolts where there is the
potential for the grinder to snag on the metal edge.

Lift the grinder away from the workpiece before turning
off the grinder.
CUTTING WITH THE TOOL
See Figure 13, page 14.
It is important to understand the correct method for cutting
with this tool. Refer to the figure in this section to learn the
correct way to handle the tool during a cutting operation.
WARNING:
To maintain proper control, always operate the tool with
both hands, keeping one hand on the side handle. Loss
of control could cause an accident resulting in possible
serious injury.
WARNING:
Since wheel is exposed on underside of work, keep
hands and fingers away from cutting area. Any part of
your body coming in contact with moving wheel may
result in serious injury.
WARNING:
Do not grind with the side of the cutting wheel. Abrasive
cutting wheels are intended for peripheral grinding, side
forces applied to these wheels may cause them to shatter.
To make the best possible cut:

Clamp the workpiece firmly and cut close to the clamping
point to eliminate any vibration of the work. Cut the
workpiece using the peripheral edge of the cutting
wheel. When cutting conduit pipe or angle iron, clamp
the workpiece in a vise if possible and cut close to the
vise. To cut thin sheet material, “sandwich” the material
between hardboard or plywood and clamp the layers to
eliminate vibration and material tearing.
DANGER:
Never use the tool with the guard removed. It has been
designed for use only with the guard installed. Attempting
to use tool with guard removed will result in loose
particles being thrown against the operator resulting in
serious personal injury.