Husqvarna HG 125 VS Original Instructions Manual page 22

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.
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. 21).
FIG. 21
Operating Instructions
-22-
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).
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.
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.
GRIT
Coarse
16-24-30
Medium
36-50-80
Fine
100-120
Very Fine
150-180