Bosch Professional GST 90 BE Manual Original página 17

Moving the base plate (see figure G)
You can move the base plate (5) back for sawing close to
edges.
Loosen the screw (19) and push the base plate (5) towards
the mains cable as far as it will go.
Retighten the screw (19).
Sawing with an offset base plate (5) is only possible with a
mitre/bevel angle of 0°. In addition, the parallel guide with
circle cutter (22) (accessory) as well as the anti-splinter
guard (14) must not be used.
Sawdust blower device
The cutting line can be kept clear of chips using the airflow
from the sawdust blower device.
To switch on the sawdust blower device:
When working with high material removal in
wood, plastic and other similar materials,
push the switch (6) towards the extraction
outlet.
To switch off the sawdust blower device:
When working in metal and with a dust extrac-
tion system connected, push the switch (6)
towards the saw blade.
Starting Operation
Pay attention to the mains voltage. The voltage of the
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power source must match the voltage specified on the
rating plate of the power tool. Power tools marked
with 230 V can also be operated with 220 V.
Switching On and Off (GST 90 E)
Make sure that you are able to press the On/Off switch
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without releasing the handle.
To switch on the power tool, slide the on/off switch (2) for-
wards so that "I" appears on the switch.
To switch off the power tool, slide the on/off switch (2)
backwards so that "0" appears on the switch.
Switching On and Off (GST 90 BE)
Make sure that you are able to press the On/Off switch
u
without releasing the handle.
To switch on the power tool, press the on/off switch (2).
To lock the on/off switch (2), keep it pressed down and
push the locking mechanism (1) to the right or left.
To switch off the power tool, release the on/off switch (2).
If the on/off switch (2) is locked, press the switch first and
then release it.
Controlling the stroke rate (GST 90 BE)
You can variably adjust the stroke rate of the power tool
when it is on by pressing in the on/off switch (2) to varying
extents.
Applying light pressure to the on/off switch (2) results in a
low stroke rate. Applying increasing pressure to the switch
increases the stroke rate.
Bosch Power Tools
Preselect the stroke rate
You can also preselect the stroke rate and change it during
operation using the stroke rate preselection thumbwheel
(3).
The required stroke rate is dependent on the material and
the work conditions and can be determined using practical
tests.
It is recommended that you reduce the stroke rate when
placing the saw blade on the workpiece and when sawing
plastic and aluminium.
During prolonged periods of use at a low stroke rate, the
power tool may heat up significantly. Remove the saw blade
and let the power tool run at the maximum stroke rate for
around three minutes to cool down.
Working Advice
Pull the plug out of the socket before carrying out any
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work on the power tool.
Switch the power tool off immediately if the saw blade
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becomes blocked.
When machining small or thin workpieces, always use
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a stable base or saw table (accessory).
Before sawing into wood, chipboard, building materials,
etc., check for and remove any foreign objects such as nails,
screws, etc.
Plunge cutting (see figure H)
Plunge cuts may only be applied to soft materials,
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such as wood, gypsum board, etc.
For plunge cutting, use only short saw blades. Plunge cutting
is possible only with a mitre angle of 0°.
Place the power tool so that the front edge of the base plate
(5) rests on the workpiece, without the saw blade (10)
touching the workpiece, and switch it on. On power tools
with stroke rate control, select the maximum stroke rate.
Press the power tool firmly against the workpiece and allow
the saw blade to plunge slowly into the workpiece.
As soon as the base plate (5) rests fully on the workpiece,
continue sawing along the required cutting line.
Parallel guide with circle cutter (accessory)
When working with the parallel guide with circle cutter (22)
(accessory), the workpiece must be no more than 30 mm
thick.
Parallel cuts (see figure I): Loosen the locking screw (21)
and slide the scale on the parallel guide through the guide
(20) in the base plate. Adjust the desired cutting width as a
scale value on the inside edge of the base plate. Retighten
the locking screw (21).
Circular cuts (see figure J): Drill a hole large enough to push
the saw blade through on the cutting line within the circle to
be cut. Machine the drill hole with a router or file so that the
saw blade can lie flush with the cutting line.
Position the locking screw (21) on the other side of the par-
allel guide. Slide the scale on the parallel guide through the
guide (20) into the base plate. Drill a hole in the workpiece
in the middle of the section to be cut out. Insert the centring
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