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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 GRIT
To remove paint and to smooth Coarse
surface irregularities. 16-24-30
To smooth Medium
the rough sanding. 36-50-80
To remove scratches left by Fine
previous discs. 100-120
To smooth surfaces for painting, Very Fine
polishing or waxing. 150-180
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
a
nd 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.
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.
Sanding Operations
Wire Brush Operations
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-
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
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.
BRUSHING PRESSURE
1. Remember, the tips of a wire brush do the
work. Operate the brush with the lightest
!
WARNING
!
WARNING
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