Sanding Tips - Bosch GWS18V-8B15 Operating/Safety Instructions Manual

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.
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.
Sanding Operations
SELECTING SANDING DISC
Sanding discs are made of extremely hard and sharp
aluminum oxide grits, phenol-resin bonded to a sturdy
fiber backing for fast heavy-duty service and long life.
The discs vary as to size and spacing of the abrasive
grits. OPEN COAT (type H) — used for soft materials and
on paint or varnish. CLOSED COAT (type K) —used for
metal, hardwood, stone, marble and other materials.
Sanding discs range in grit from 16 (very coarse) to 180
(very fine). 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 get the job done faster. See chart for
application examples.
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.
Operating Instructions
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 (e.g. sand stone).

Sanding Tips

For best results, tilt the Disc Sander at a 10° to 15° angle
while sanding so that only about 1" of the surface around
the edge of the disc contacts the work.
comes in contact with the work, a violent thrust to the
side may result.
If sander is tilted too much, sanding action will be too
great and a rough cut surface or gouging and snagging
GRIT will result.
Guide the Disc Sander with crosswise strokes. Be careful
Coarse
not to hold the sander in one spot too long. Do not use a
16-24-30
circular motion, as this makes swirl marks. Test before
Medium
use on scrap stock.
36-50-80
Do not force or apply pressure when sanding. Use only
Fine
the weight of the tool for pressure. Excess pressure
100-120
actually slows the tool down. If faster stock removal is
desired, change to a coarser grit disc.
Very Fine
R e m ove g u m my p a i n t f ro m m et a l w i t h a n
150-180
"open coat" disc. Sand until sparks star t to
appear, then stop and change to a "closed coat" disc to
remove any remaining paint.
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If the disc (accessory) is held flat
or the back edge of the disc