Bosch GWS18V-8 Operating/Safety Instructions Manual page 21

2610067310_04-21_GWS18V-8.qxp_GWS 4/1/21 10:06 AM Page 21
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.
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 forward with wheel lined up
with the cut line and hold the tool by the
grinder body and the auxiliary 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
Never pull the tool
backward since blade will
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.
CONCRETE SURFACING
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
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FIG. 15