Protool SBP 285 Mode D'emploi page 9

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Remaining risks
Even when the electric tool is used properly and all the
relevant safety measures are followed, the following
remaining risks can still occur due to the design of the
electric tool required for the intended working
operations:
- contact with the working tool in the cutting area;
- hazards invited by the flexible supply cord.
Operating the electric tool for
a first time
The portable band saws are designed as Class I tools,
optionally 1-phase AC or 3-phase AC, meeting the
requirements on Protection Class IP44 and equipped
with earthing connection.
- Check if the actual mains voltage is correct (see the
nameplate).
- Check the sense of rotation (see the arrow on the
motor housing).
- The switching unit integrated into the right handle is
protected against inadvertent operation. For
switching on, first press the lock-off button (12)
located at the face of the selector-switch lever (11)
and turn the lever, with the lock-off button depressed
simultaneously. Then the lock-off button may be
released, but the selector-switch lever is to be hold
at ON position. The electric tool switches off
automatically when the lever is released.
- Generally, for sawing along a marked line, cutting
direction is upwards. When necessary, there is also
possible to reverse cutting direction, so that the saw
band runs downwards.
- For easy transportation, storage or putting the
electric tool aside during work, it is recommended to
use the transport carriage (accessories).
- For jobs where full cutting height is not needed, it is
advisable to use the adjustable guide extension
(accessories) to achieve better saw band guidance.
This guide extension is to be inserted into the lower
part of the tool housing instead of the standard saw
band guide. Thus the clear cutting height can be
varied between 200 mm and 280 mm.
Fitting of the saw band
- Place the electric tool on a flat support so that it
cannot tilt.
- Loosen the star-shaped hand nut (3) on the lower
part of the tool housing.
- Remove both the safety guards (9, 10) by
pressing both the retaining springs (1, 2) together.
- Loosen the wing screws (8) of the four saw
band guides and push them back.
- When inserting the saw band, ensure that cutting
direction of the saw teeth matches the direction of
rotation. Otherwise the saw band must be reversed.
- Slightly tension the saw band, using the star-shaped
hand nut (3), and turn the drive wheel by hand
for a while.
Check if the saw band runs in the middle of the wheel
peripheral surface.
GB
- Adjust running of the saw band when necessary,
using the wing screw (4). The locking nut (5) must be
loosened first and retightened after correction of the
saw band running is finished.
After replacement of the saw band with a new one or
with a wider/narrower saw band, there is not necessary
to adjust saw band running, but only adjust the saw
band guides.
- Tension the saw band by means of the hand nut (3).
- Push all the four saw band guides with the wing
screws (8) forward, until the guide pin (6) for back
guidance touches the rear edge of the saw
band. Push the guide sleeve (7) for lateral
guidance of the saw band so far forward that the saw
teeth run outside of the guide sleeve.
- Set the guide pin to a distance of approximately
1 mm from the saw band and tighten the wing screw.
Only when cutting pressure is applied, the saw band
should touch the back guidance and even then the
saw teeth must not touch the guide sleeves.
- Replace both the safety guards (9, 10).
Prevention of cracks
in the saw band
Correct alignment of the saw band
Alignment of the saw band has to be such that it runs in
the middle of the coating on the drive wheel peripheral
surface. Under no circumstances may the teeth project
beyond the rim of the drive wheel coating, as the saw
band is liable to warping and breakage otherwise.
Adjustment of the saw band back guidance
The distance between the rear edge of the saw band
and the guide pin for back guidance should be 1 mm
when the saw is running at no load. The back of the
saw band should only contact the back guidance during
sawing, otherwise the back of the saw band and the
guide get overheated, which results in excessive strain
and formation of cracks.
Relieving the saw band tension
When the saw is not being used for longer periods, it is
advisable to relieve tension of the saw band. Firstly to
prevent uneven deformation of the drive wheel coating,
secondly because the saw band heats up during
sawing or at high room temperatures and contracts with
temperature drops. A saw band which is strongly
tensioned during sawing will excessively stretch and
therefore breaks too early.
Regular sharpening of saw bands
Sharpening is particularly important for service life of
the saw bands. Blunt saw bands often derail and
overheat with the result of excessive strain and
formation of cracks.
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