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BM 2610009659 03-10 :BM 2610009659 03-10 3/9/10 7:25 AM Page 15
faster stock removal is desired, change to a
coarser grit disc.
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.
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.
Be aware that wire bristles
W RNING
are thrown by 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.
CORRECT:
Wire tips doing
the work.
CORRECT:
Wire tips doing
the work.
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
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
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.
WIRE WHEEL BRUSH
INCORRECT:
Excessive
pressure can
cause wire
breakage.
WIRE CUP BRUSH
INCORRECT:
Excessive
pressure can
cause wire
breakage.
-15-
SANDING METAL
BRUSHING PRESSURE
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