Bosch 3725DEVS Consignes D'utilisation/De Sécurité page 11

2610051952.qxp_3725DEVS 8/16/18 2:01 PM Page 11
TRIGGER "ON-OFF" SWITCH
To turn the tool "ON" squeeze the trigger
switch. To turn the tool "OFF", release the
trigger switch, which is spring loaded and will
return to the "OFF" position automatically.
See START OF SANDING on page 11.
"LOCK-ON" BUTTON
The "Lock-ON" button, located near the trigger
allows for continuous operation at maximum
OPM without holding the trigger (Fig. 1).
TO LOCK TRIGGER "ON": squeeze trigger,
depress button and release trigger.
TO UNLOCK THE TRIGGER: squeeze trigger
and release it without depressing the "Lock-
ON" button.
depressed, the trigger can not be released.
VARIABLE SPEED WITH DIAL SETTING
Your sander is also equipped with a variable
speed dial. The sander's orbital pad speed can
be preset from zero to maximum nameplate
OPM by rotating the dial in the housing. The
dial may be set on or between any of six
positions (1=low through 6=high). The "Lock-
SELECTING SANDING DISCS
Open-coat aluminum oxide sanding discs are
recommended for most wood or metal sanding
applications, as this synthetic material cuts
quickly and wears well. Some applications,
such as plastics, glass, or stone require silicon
carbide discs, which have a very sharp cutting
edge. For best results, use Bosch sanding
and polishing accessories, which are of
superior quality and are carefully selected to
produce professional quality results with your
sander.
An alternative to standard sanding discs is to
use a SandNet™ connection pad and
SandNet™ mesh sanding discs.
START OF SANDING
With the workpiece firmly secured, first place
the sander's pad on the work surface, then
switch the tool on.
DO NOT start the tool and bring it up to speed
before applying to the work
DO NOT apply excessive pressure when
switch the tool on (or at any other time)
Operating Instructions
If the "Lock-ON" button is
continuously being
Tool Tips
ON" button may also be used with any setting
of the dial.
The following table may be used as a general
guide for abrasive and backing pad selection,
but the best results will be obtained by sanding
a test sample of the workpiece first.
Switch
Material setting
rough/finish
woods:
softwoods 4 / 6
hardwoods 4 / 6
veneers 4
metals:
steel 4
stainless 4
aluminum 4/ 6
rust spots 6
paintwork:
sanding 2 / 3
scratches 4 / 6
stripping 4
Either method will likely create swirl marks.
Applying excessive pressure upon start-up will
also shorten the life of the switch.
SANDING ACTION
This sander has optimized random sanding
action. The pad orbits and rotates freely,
duplicating natural hand sanding action for
aggressive stock removal and smooth, well-
blended surface finish. The orbit offset for this
tool is 2 mm (5/64")
In general, higher speeds will give the best
results. If faster removal is desired, DO NOT
APPLY PRESSURE ON THE TOOL; use a
coarser grade of abrasive. Move the sander in
long sweeping strokes, parallel to the grain
using some lateral motion to overlap the
strokes by as much as 75%. The random orbit
action allows cross-grain sanding, but be
careful not to tilt the sander near edges, or
undesirable rounding may result.
SANDING SEQUENCE
If the surface is rough, begin with coarser grits
and then complete the surfacing with medium
-11-
Backing Grit
pad size
rough/finish
extra soft 60 / 240
soft 60 / 180
soft 240 / 320
soft 60 / 240
soft 120 / 240
soft 80 / 240
extra soft 60 / 120
soft 180 / 400
hard 120 / 240
soft 40/60 /80