Bosch 1347A Manual page 7

Attaching the Disc Grinding Wheel
Disconnect tool from power source. Be sure
that wheel guard is in place for grinding. Place
BACKING FLANGE 7 and GRINDING
WHEEL 8 on the spindle. Thread on the lock
nut 9 and securely tighten nut with lock nut
wrench,while holding the spindle lock in.
TO REMOVE: Reverse procedure.
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 exceedthe 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 work piece 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.
CAUTION!
Excessive or sudden pressure
on the wheel will slow grinding action, overload
the motor, 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
Backing Pad
WARNING!
Before attaching a backing pad
10 be sure its maximum safe operating speed is
not exceeded by the nameplate speed of the
tool.
BM 3609929584 7/01
WARNING!
for most sanding operations. Always reinstall
wheel guard when converting back to grinding
operations.
Backing Pad and Sanding
Disconnect tool from power source. Set the
tool on its top side (spindle up). Place the
rubber backing pad 10 onto the spindle shaft 4.
Center the sanding disc 11 on top of the backing
pad. Insert the pad lock nut 12 through the disc
and thread onto the spindle as far as you can
with your fingers. Press in the spindle lock 3
and rotate the backing pad until the lock engages,
then tighten the pad lock nut securely with lock
nut wrench.
TO REMOVE THE SANDING DISC: Reverse
the above procedure.
Selecting Sanding Discs
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 where ground off particles are
fine.
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
and closed coat" discs are required to get the
job done faster.
Operation:
Remarks
To remove paint and to smooth "open coat"
surface irregularities.
To smooth the rough sanding.
To remove scratches left by
previous discs.
To smooth surface for painting "closed coat" Very Fine
polishing, or waxing.
For best results, tilt the Disc Sander at a 10° to
7
7
Wheel guard may not be used
Disc Installation
Refinishing painted wood or metal surfaces.
Type
16-24-30
"closed coat" Medium
36-50-80
"closed coat"
100-120
150-180
Sanding Tips
7/26/01, 12:40 PM
Grit
Coarse
Fine