Bosch Professional GST 12 V-LI, Original Instructions Manual

Page: 11 / 59

English | 11
To restart the tool, set the on/off switch (7) to the off posi-
tion and then switch the power tool on again.
Note: Rapidly switching the power tool off and on again may
trigger the restart protection, meaning the power tool may
not start up even if the on/off switch
(7) is pressed. Set the
on/off switch (7) to the off position and then switch the
power tool on again.
Preselect the stroke rate
You can also preselect the stroke rate and change it during
operation using the stroke rate preselection thumbwheel
(5) .
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
u
Remove the battery from the power tool before carry-
ing out work on the power tool (e.g. maintenance,
changing tool, etc.). The battery should also be re-
moved for transport and storage.
There is risk of injury
from unintentionally pressing the on/off switch.
u
Switch the power tool off immediately if the saw blade
becomes blocked.
u
Always use a sturdy support when working on small or
thin workpieces.
Before sawing into wood, chipboard, building materials,
etc., check for and remove any foreign objects such as nails,
screws, etc.
Jigsaws are primarily designed for curved cuts. The range of
products from
Bosch also includes accessories which enable
straight cuts or circular cuts (depending on the jigsaw
model, e.g. parallel guide, guide rail or circle cutter).
Hand-held jigsaws generally tend to go off at an angle, i.e.
under certain circumstances the angle and cutting accuracy
can no longer be ensured. Decisive influencing factors on the
accuracy are the saw blade thickness, cutting length and the
material thickness and strength of the workpiece.
Therefore, always check using test cuts whether the cutting
result of the selected system meets the requirements of your
application.
Plunge cutting (see figure I)
u
Plunge cuts may only be applied to soft materials,
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
(9) rests on the workpiece, without the saw blade (13)
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
(9) 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 (27)
(accessory), the workpiece must be no more than 30 mm
thick.
Parallel cuts (see figure
J ): Loosen the locking screw (26)
and slide the scale on the parallel guide through the guide
(12) 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
(26) .
Circular cuts (see figure K ): 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
(26) on the other side of the par-
allel guide. Slide the scale on the parallel guide through the
guide
(12) into the base plate. Drill a hole in the workpiece
in the middle of the section to be cut out. Insert the centring
tip
(28) through the inner opening of the parallel guide and
into the drilled hole. Adjust the radius as a scale value on the
inside edge of the base plate. Retighten the locking screw
(26) .
Coolant/lubricant
As the material heats up along the cutting line when cutting
metal, you should apply coolant or lubricant.
Maintenance and Service
Maintenance and Cleaning
u
Remove the battery from the power tool before carry-
ing out work on the power tool (e.g. maintenance,
changing tool, etc.). The battery should also be re-
moved for transport and storage.
There is risk of injury
from unintentionally pressing the on/off switch.
u
To ensure safe and efficient operation, always keep
the power tool and the ventilation slots clean.
Clean the saw blade receptacle regularly. For this, remove
the saw blade from the power tool and lightly tap out the
power tool on a level surface.
If the power tool becomes very dirty, this can lead to serious
faults. For this reason, do not cut materials which generate
large quantities of dust from below or overhead.
If the dust outlet becomes blocked, switch off the power
tool, disconnect the dust extraction system and remove the
dust and chips.
Apply a drop of oil to the guide roller
(10) from time to time.
Check the guide roller (10) regularly. If worn, it must be re-
placed through an authorised Bosch after-sales service
centre.
Bosch Power Tools 1 609 92A 74K | (28.01.2022)