Bosch AG40-85 Consignes D'utilisation/De Sécurité page 23

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 correct wheel to
use is determined by the job.
1. Allow the tool to reach full speed before
touching the tool to the work surface.
2. Hold the tool with two hands and keep
diamond wheel flat on the work surface.
Sanding
Sanding discs range in grit from 16 (very
course) to 180 (very fine). They also vary in
size and spacing of grit.
OPEN COAT (type H) is used for soft materials
and on paint and varnish, CLOSED COAT
(type K) is used for metal, hardwood, stone,
marble and other materials. To obtain best
results, select sanding discs carefully. Many
jobs require the use of several grit sizes and at
times both open coat and closed coat discs are
required to complete the job. See chart for
application examples.
1. Allow the tool to reach full speed before
touching the tool to the work surface.
2. Apply minimum pressure to the work
surface, allowing the tool to operate at high
speed. Sanding rate is greatest when the
tool operates at high speed.
3. Maintain a 10° to 15° angle between the tool
and work surface, (Fig. 23).
FIG. 23
4. Continuously move the tool at a moderate
speed to avoid creating gouges in the work
surface.
3. Apply minimum pressure, allowing the tool
to operate at high speed. Removal rate is
greatest when the tool operates at high
speed.
4. Continuously move the tool at a moderate
speed to avoid creating gouges in the work
surface.
5. Remove the tool from work surface before
turning tool off. Allow the tool to stop rotating
before laying it down.
Tip: For optimal dust collection, all sides of the
surfacing dust collection guard must stay in
contact with the surface and the surfacing
guard must be connected to a vacuum. A dull
diamond wheel can be sharpened by briefly
surfacing an abrasive material (eg. sand
stone).
5. Remove the tool from work surface before
turning tool off. Allow the tool to stop rotating
before laying it down.
Tips: Guide the disc with crisscross strokes.
Do not use a circular motion as this makes
swirl marks.
Operation: Refinishing painted wood or metal surfaces.
REMARKS
To remove paint and to smooth
surface irregularities.
To smooth the rough sanding.
To remove scratches left by
previous discs.
To smooth surfaces for painting,
polishing or waxing.
-23-
GRIT
Coarse
16-24-30
Medium
36-50-80
Fine
100-120
Very Fine
150-180