Bosch 1370DEVS Operating/Safety Instructions Manual page 7

BM 3609929305 10/01 10/2/01
BACKING PAD INSTALLATION
The random orbit sander is equipped with a
backing pad of medium hardness, which is
suitable for general service. Harder and softer
pads are available for other purposes, and in
general are used as follows;
Soft pad - Polishing or sanding large or
curved surfaces.
Medium pad - All purpose general sanding
and polishing.
Hard pad - Heavy sanding on flat surfaces,
especially with coarser abrasives.
To change backing pad, hold pad firmly and
turn screw counterclockwise with 6mm allen
wrench provided. Remove old pad, and place
new pad over locating pins on drive spindle.
Replace screw and securely tighten in a
clockwise direction with the allen wrench.
Damaged or worn backing pads must be
replaced immediately (Fig. 1).
INSTALLING ACCESSORIES
The random orbit sander uses hook-and-loop
backed accessories, which firmly grip the pad
when applied with moderate pressure. To
change the accessory, merely peel off the old
accessory, remove dust from the pad if
necessary, and press the new accessory in
place. Be sure to align the sanding disc holes
with the holes in the backing pad to allow the
dust extraction system to function.
After considerable service the pad surface will
become worn, and the pad must be replaced
when it no longer offers a firm grip. If you are
experiencing premature wearout of the pad
facing, decrease the amount of pressure you
are applying during operation of the tool.
SETTING DRIVE DISC
The drive disc may be installed in two different
positions, which controls the movement of the
pad, which affects the type of finish the tool
will produce.
When the drive disc is assembled in the
"Direct Drive" mode with the teeth facing UP,
the gear teeth on the drive disc are engaged
with the gears on the tool, producing a
positive transmission of power.
This position is best for aggressive sanding
applications where fast stock removal is
desired, or for heavy buffing (Fig.2).
When the drive disc is reversed and the teeth
are facing DOWN, the smooth rubber drive
ring on the disc is in contact with the gear ring
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Assembly
on the tool, producing a "Friction Drive" mode,
which allows the tool pad to slip as more
pressure is applied by the operator producing
a friction transmission of power (Fig. 3).
FIG. 2
DRIVE DISC
(Drive Position a)
With a little practice, the rotational speed of
the pad can be controlled to produce very fine
sanding finishes or deeply polished surfaces
with no unwanted swirl marks.
DUST EXTRACTION
The integral dust extraction system collects
sanding dust in the bag supplied with your
sander. For maximum efficiency, the bag
should be emptied when it is no more than half
full, and should be replaced when it becomes
clogged with dust. To empty or replace bag,
squeeze the tabs on the mounting ring, pull
bag free of dust port adapter, and empty
contents of bag into a suitable receptacle
(Fig. 1)..
For added efficiency, a vacuum hose is also
available which will allow your sander to be
connected to a shop vacuum system. See
your Bosch catalog for this and other optional
Bosch Airsweep accessories.
SIDE HANDLE
The side handle used to guide and balance
the tool can be threaded into the front housing
on either side of the tool, depending on per-
sonal preference and comfort. Use the side
handle for safe control and ease of operation.
The front housing has threaded holes on both
sides, which contains screws caps when not
in use. To mount handle, remove one screw
cap on desired side of front housing, and
thread handle securely in place (Fig.1).
Do not run the tool without these cap screws.
The dust extraction system will not function
correctly.
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FIG. 3
DRIVE DISC
(Drive Position b)