Bosch 1873-8 Consignes De Fonctionnement/Sécurité page 13

2610001808.qxp_1873 10/10/16 8:19 AM Page 13
PADDLE SWITCH WITH "LOCK-OFF"FEATURE
(Models 1873-8D only)
The Paddle switch enables the operator to
control the switch functions of "Lock-OFF",
and "ON/OFF".
tool, since torque from the motor can cause the
tool to twist.
TO UNLOCK SWITCH AND TURN TOOL
"ON": Push paddle lever FORWARD (toward
Grinding Operations
SELECTING GRINDING WHEELS
maximum safe operating speed is not
exceeded by the nameplate speed of the
grinder. Do not exceed the recom mended
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
keep ing 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.
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 work piece when pushing
forward.
CUTTING METAL
Using the optional Type 1A wheel guard, it is
possible to perform limited cutting on small
Hold the tool with both
hands while starting the
Before using a grinding
wheel, be certain that its
Excessive or sudden pres-
sure on the wheel will slow
the spindle) then squeeze the paddle lever.
TO SWITCH TOOL "OFF": Release pressure
on paddle lever. The switch is spring loaded
and will return to "OFF" position automatically.
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.
stock such as metal tubes, piping or rebar.
When cutting, work with moderate feed,
adapted to the material being cut. Do not
exert side pressure onto the cutting disc, tilt
or oscillate the tool. When cutting profiles
and square bar, it is best to start at the
smallest cross section.
Always follow precautions for kickback.
Do not apply side pressure to cutting wheel
to reduce wheel speed.
The tool should always be used so that
sparks are directed away from user.
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.
GRIT
Coarse
16-24-30
Medium
36-50-80
Fine
100-120
Very Fine
150-180
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