-15-
Operating Instructions
Grinding Operations
SELECTING GRINDING WHEELS
Rated
RPM
of
the
grinding or cutting wheel
must be greater or equal to maximum RPM
marked on the nameplate of the tool.
Do not
use wheels rated at lower RPM than the
maximum RPM marked on the nameplate of
the tool.
GRINDING WHEELS
Grinding wheels should be carefully selected
in order to use the grinder most efficiently.
Wheels vary in type of abrasive, bond,
hardness, grit size and structure. The correct
type of wheel to use is determined by the job.
Use grinding wheels for fast grinding of
structural steel, weld beads, steel casting,
stainless steel and other ferrous metals.
GRINDING TIPS
Efficient grinding is achieved by controlling
the pressure and keep ing the angle between
wheel and workpiece at 10° to 15° (Fig. 6). If
the wheel is flat, the tool is difficult to control.
If the angle is too steep, the pressure is
concentrated on a small area causing burning
to the work surface.
Excessive or sudden
pressure on the wheel
will slow grinding action and put dangerous
stresses on the wheel.
When grinding with a new wheel be certain to
grind while pulling tool backwards until wheel
becomes rounded on its edge. New wheels
have sharp corners which tend to “bite” or
cut into work piece when pushing forward.
Cutting Operations
METAL CUTTING
With this grinder it is possible to perform
cutting of limited small stock such as metal
tubes, piping or rebar. When cutting, work
with moderate feed, adapted to the material
being cut. When cutting profiles and square
bar, it is best to start at the smallest cross
section.
Always follow precautions for kickback.
1. Allow the tool to reach full speed before
touching the tool to the work surface.
2. The tool should always be used in such way
that the sparks are directed away from
user.
3. Apply minimum pressure to the work
surface, allowing the tool to operate at
high speed. Cutting rate is greatest when
the tool operates at high speed.
4. Do not exert side pressure onto the cutting
disc. Do not tilt or oscillate the tool as
wheel may burst, (Fig. 7).
5. Remove the tool from the work surface
before turning the tool off. Allow the tool
to stop rotating before laying it down.
FIG. 6
FIG. 7
