Ryobi P420 - Manual (Page 15)

15
OPERATION
OPERATING THE GRINDER
See Figure 12.
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 6,500 r/min. or more. The grinding wheel
provided with the grinder is suitable for grinding welds,
preparing surfaces to be welded, grinding structural steel,
and grinding stainless steel.
To operate the grinder:

Secure all work in a vise or clamp to a workbench.
DANGER:
Never use the grinder with the guard removed. It has been
designed for use only with the guard installed. Attempting
to use grinder with guard removed will result in loose
particles being thrown against the operator resulting in
serious personal injury.
 Hold the grinder in front and away from you with
both hands, keeping the grinding wheel clear of the
workpiece.
 Turn on the grinder and let the motor and grinding wheel
build up to full speed.
 Lower the grinder gradually until the grinding wheel
contacts the workpiece.
 Keep the grinder tilted at an angle between 5° and 15°.
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.
 Move the grinder continuously at a steady, consistent
pace.
CAUTION:
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. Fig. 12
Fig. 11
270°
180°
90°
Fig. 10
SIDE HANDLE ON RIGHT SIDE OF GRINDER
TOOLLESS
GUARD