Bosch 1873-8 Instrucciones De Funcionamiento página 11

BM 2610001808 02-09:BM 2610001808 02-09 2/9/09 2:49 PM Page 11
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.
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.
If the disc (accessory) is held flat or the back
edge of the disc 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 will result.
Guide the Disc Sander with crosswise strokes.
Be careful not to hold the sander in one spot too
long. Do not use a circular motion, as this
makes swirl marks. Test before use on scrap
stock.
Wire brushes are intended to "clean"
structural steel, castings, sheet metal, stone
and concrete. They are used to remove rust,
scale and paint.
Avoid bouncing and snag-
W RNING
ging the wire brush, espe-
cially when working corners, sharp edges
etc. This can cause loss of control and
kickback.
BRUSHING PRESSURE
1. Remember, the tips of a wire brush do the
work. Operate the brush with the lightest
pressure so only the tips of the wire come in
contact with the work.
2. If heavier pressures are used, the wires
will be overstressed, resulting in a wiping
action; and if this is continued, the life of the
brush will be shortened due to wire fatigue.
3. Apply the brush to the work in such a way
Do not force or apply pressure when sanding.
Use only the weight of the tool for pressure.
Excess pressure actually slows the tool down. If
faster stock removal is desired, change to a
coarser grit disc.
GRIT
Remove gummy paint from metal with an "open
coat" disc. Sand until sparks start to appear,
Coarse
16-24-30 then stop and change to a "closed coat" disc to
remove any remaining paint.
Medium
36-50-80
When sanding wood the direction of the disc
Fine
100-120 motion at the contact point should parallel the
grain as much as possible. The rapid cut of
Very Fine
discs and the swirl type scratch pattern they
150-180
occasionally create generally prohibit their use
for producing the final finish.
Scratches and circular marks are usually the
result of using too coarse a grit. When changing
to a finer grit, move across the sanding lines that
were made by a previous coarser disc.
When sanding automobiles or appliances, wipe
the metal clean with a non-flammable solvent or
commercial cleaner to remove all wax and
grease. By doing this first, the sanding discs will
sand better and last longer.
For heavy duty work, use a coarse grit disc first.
Follow-up with a medium grit to remove
scratches. To produce smooth finish, use fine
grit disc.
Wire Brush Operations
that as much of the brush face as possible is
in full contact with the work. Applying the side
or edge of the brush to the work will result in
wire breakage and shortened brush life.
INCORRECT: Excessive pressure can cause wire breakage.
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SANDING WOOD
SANDING METAL
CORRECT: Wire tips doing the work.