Bosch 1873-8 Consignes De Fonctionnement/Sécurité page 14

2610001808.qxp_1873 10/10/16 8:19 AM Page 14
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.
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.
Wire brushes are intended to "clean"
structural steel, castings, sheet metal, stone
and concrete. They are used to remove rust,
scale and paint.
cially when working corners, sharp edges
etc. This can cause loss of control and
kickback.
the brush even during ordinary operation.
Do not overstress the wires by applying
excessive load to the brush. The wire
bristles can easily penetrate light clothing
and/or skin.
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
14
Wire Brush Operations
Avoid bouncing and snag-
ging the wire brush, espe-
Be aware that wire
bristles are thrown by
Remove gummy paint from metal with an "open
coat" disc. Sand until sparks start to appear,
then stop and change to a "closed coat" disc to
remove any remaining paint.
SANDING WOOD
When sanding wood the direction of the disc
motion at the contact point should parallel the
grain as much as possible. The rapid cut of
discs and the swirl type scratch pattern they
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 sand ing lines
that were made by a previous coarser disc.
SANDING METAL
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.
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
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.
CORRECT: Wire tips doing the work.
INCORRECT: Excessive pressure can cause wire breakage.