Starting Operation; Working Advice - Bosch GST 75 BE Professional Originalbetriebsanleitung

OBJ_BUCH-171-004.book Page 22 Thursday, June 17, 2010 11:43 AM
22 | English

Starting Operation

Observe correct mains voltage! The voltage
of the power source must agree with the
voltage specified on the nameplate of the
machine. Power tools marked with 230 V
can also be operated with 220 V.
Switching On and Off
To start the machine, press the On/Off switch 2
and keep it pressed.
To lock the pressed On/Off switch 2, push the
lock-on button 1 toward the right or left.
To switch off the machine, release the On/Off
switch 2. When the On/Off switch 2 is locked,
press it first and then release it.
Controlling/Presetting the Stroke Rate
Increasing or reducing the pressure on the
On/Off switch 2 enables stepless stroke-rate
control of the switched-on machine.
Light pressure on the On/Off switch 2 results in
a low stroke rate. Increasing the pressure also
increases the stroke rate.
When the On/Off switch 2 is locked, it is not
possible to reduce the stroke rate.
With the thumbwheel for stroke rate preselec-
tion 4, the stroke rate can be preset and
changed during operation.
1–2: Low stroke rate
3–4: Medium stroke rate
5–6: High stroke rate
The required stroke rate is dependent on the
material and the working conditions and can be
determined by a practical trial.
Reducing the stroke rate is recommended when
the saw blade engages in the material as well as
when sawing plastic and aluminium.
After longer periods of work at low stroke rate,
the machine can heat up considerably. Remove
the saw blade from the machine and allow the
machine to cool down by running it for approx.
3 minutes at maximum stroke rate.
1 609 929 W89 | (17.6.10)
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Working Advice

When working small or thin work pieces, al-
ways use a sturdy support or a saw table
(accessory).
Check wood, press boards, building materials,
etc. for foreign objects such as nails, screws or
similar, and remove them, if required.
Plunge Cutting (see figure H)
The plunge cutting procedure is only suita-
ble for treating soft materials such as wood,
plaster board or similar! Do not work metal
materials with the plunge cutting proce-
dure!
Use only short saw blades for plunge cutting.
Plunge cutting is possible only with the mitre an-
gle set at 0°.
Place the machine with the front edge of the
base plate 6 on to the workpiece without the
saw blade 10 touching the workpiece and
switch on. For machines with stroke rate con-
trol, select the maximum stroke rate. Firmly
hold the machine against the workpiece and by
tilting the machine, slowly plunge the saw blade
into the workpiece.
When the base plate 6 fully lays on the work-
piece, continue sawing along the desired cutting
line.
Parallel Guide with Circle Cutter (Accessory)
For cuts using the parallel guide with circle cut-
ter 26 (accessory), the thickness of the material
must not exceed a maximum of 30 mm.
Parallel Cuts (see figure J): Loosen the locking
screw 25 and slide the scale of the parallel guide
through the lead 24 in the base plate. Set the
desired cutting width as the scale value on the
inside edge of the base plate. Tighten the lock-
ing screw 25.
Circular Cuts (see figure K): Set the locking
screw 25 to the other side of the parallel guide.
Slide the scale of the parallel guide through the
lead 24 in the base plate. Drill a hole in the work-
piece centred in the section to be sawn. Insert
the centring tip 27 through the inside opening of
the parallel guide and into the drilled hole. Set
the radius as the scale value on the inside edge
of the base plate. Tighten the locking screw 25.
Bosch Power Tools