Bosch GWS18V-8B15 Operating/Safety Instructions Manual page 22

MASONRY / CONCRETE CUTTING
With this grinder it is possible to perform cutting of
concrete and masonry materials. When cutting, work with
moderate feed, adapted to the material being cut.
Always follow precautions for kickback.
Operate the tool with a dust extraction system and
personal dust protection, e.g. respirator, dust mask, etc.
The vacuum used for this application must be approved for
the extraction of masonry and concrete dust. Bosch sells
suitable vacuum cleaners.
Never pull the tool backward
since blade will climb out of the
material and KICKBACK will occur.
1. Allow the tool to reach full speed before touching the
tool to the work surface.
2. If plunge cutting:
a. Tilt tool for ward with wheel lined up
with the cut line and hold the tool by the
grinder body and the auxiliar y handle
(Fig. 15).
b. Gradually lower the rear of tool using the front end of
the foot as the hinge point.
c. When the foot rests flat on the surface being cut,
proceed cutting in forward direction to end of cut.
3. Always maintain contact between the guard foot and
work piece.
4. Slide the tool forward at a moderate speed adapted
to the material being cut. Always cut towards the dust
extraction port to maximize dust extraction and reduce
likelihood of kickback (Fig. 16).
5. 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.
6. When the cut is completed, remove tool from work
piece before turning off. Allow wheel to stop rotating
before setting tool down.
Tip: When performing deep cuts, it is best to cut in several
shallow passes. Each pass should be only to the segment
depth of the wheel. Masonry dust is abrasive and may
wear and weaken the segment bond.
Operating Instructions
FIG. 16
When cutting especially hard material, e. g., concrete with
high pebble content, the dry diamond wheel can overheat
and become damaged. This is clearly indicated by circular
sparking of the rotating dry diamond wheel. In this case,
interrupt the cutting process and allow the dry diamond
wheel to cool by running the tool for a short period of time
at the maximum speed with no-load.
Noticeable decreasing work progress and circular sparking
are indications of a dry diamond wheel that has become
dull. Briefly cutting into abrasive materials (e. g. brick) can
resharpen the wheel.
Operate the tool with a dust extraction system and
personal dust protection, e.g. respirator, dust mask, etc.
The vacuum used for this application must be approved for
the extraction of masonry and concrete dust. Bosch sells
suitable vacuum cleaners.
Diamond cup wheels should be carefully selected in order
to use the grinder most efficiently. Wheels vary in type of
material they are designed to remove and how aggressively
they will remove material. The correct wheel to use is
determined by the job.
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CONCRETE SURFACING
FIG. 15