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OPERATION
SLIDE ON-OFF SWITCH WITH LOCK (Fig. 4)
The tool is switched "ON" by the switch button located at the
top of the motor housing. The switch can be locked in the
"ON" position, a convenience for long grinding operations.
To turn the tool "ON" without locking it, slide the switch
button forward by applying pressure ONLY at the REAR
portion of the button. When pressure is released the switch
button will snap to "OFF" position.
To lock the switch "ON", slide the switch button forward and
press "IN" the FRONT portion.
To unlock the switch, simply press and release the REAR
portion of the button. Switch is spring loaded and will snap
back automatically.
WARNING!
Hold the tool with both hands while starting the
tool, since torque from the motor can cause the
tool to twist.
Start the tool before applying to work and let the tool come
to full speed before contacting the workpiece. Lift the tool
from the work before releasing the switch. DO NOT turn the
switch "ON" and "OFF" while the tool is under load; this will
greatly decrease the switch life.
GRINDING OPERATIONS
Selecting Grinding Wheels
WARNING!
Before using a grinding wheel, be certain that
its maximum safe operating speed is not
exceeded by the nameplate speed of the
grinder. Do not exceed the recommended
wheel diameter.
Disc Grinding Wheels
Grinding wheels should be carefully selected in order to use
the grinder most efficiently. Wheels vary in type of abrasive,
bond, hardness, grit size and structure. The correct type of
wheel to use is determined by the job. Use disc grinding
wheels for fast grinding of structural steel, heavy weld beads,
steel casting, stainless steel and other ferrous metals.
Grinding Tips
Efficient grinding is achieved by controlling the pressure and
keeping the angle between wheel and workpiece at 10° to
15°. If the wheel is flat, the tool is difficult to control. If the
angle is too steep, the pressure is concentrated on a small
area causing burning to the work surface.
WARNING!
Excessive or sudden pressure on the wheel will
slow grinding action and put dangerous
stresses on the wheel.
When grinding with a new wheel be certain to grind while
pulling tool backwards until wheel becomes rounded on its
edge. New wheels have sharp corners which tend to "bite"
or cut into workpiece when pushing forward.
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.
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.
WARNING!
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.
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 sanding 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.
WIRE BRUSH OPERATIONS
Wire brushes are intended to "clean" structural steel,
castings, sheet metal, stone and oncrete.
They are used to remove rust, scale and paint.
WARNING!
Avoid bouncing and snaging the wire brush,
especially when working corners, sharp edges
etc. This can cause loss of control and kick-back.
5
GRIT
Coarse
16-24-30
Medium
36-50-80
Fine
100-120
Very fine
150-180
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