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Grinding Operations
SELECTING GRINDING WHEELS
Before using a grinding wheel,
be certain that its maximum
safe operating speed is not exceeded by the
nameplate speed of the grinder. Do not exceed the
recom mended wheel diameter.
DISC 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 disc grinding wheels for fast grinding of structural
steel, heavy 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°. 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
A Type 1A/41 wheel guard may
not be included with this tool
but is required when using a cutting wheel. Cutting with
a type 27 wheel guard may not provide the operator
sufficient protection in the event of a wheel burst.
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. 14).
5. Remove the tool from the work surface before turning
the tool off. Allow the tool to stop rotating before laying it
down.
Operating Instructions
FIG. 14
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