Dust Extraction; Operating Modes; Starting Operation - Bosch Professional GDC 125 Manual Original

OBJ_BUCH-1810-004.book Page 17 Wednesday, February 4, 2015 11:49 AM

Dust Extraction

 Dusts from materials such as lead-containing coatings,
some wood types, minerals and metal can be harmful to
one's health. Touching or breathing-in the dusts can cause
allergic reactions and/or lead to respiratory infections of
the user or bystanders.
Certain dusts, such as oak or beech dust, are considered
as carcinogenic, especially in connection with wood-treat-
ment additives (chromate, wood preservative). Materials
containing asbestos may only be worked by specialists.
– It is recommended to wear a P2 filter-class respirator.
Observe the relevant regulations in your country for the mate-
rials to be worked.
 Prevent dust accumulation at the workplace. Dusts can
easily ignite.
Mounting/Replacing the Diamond Cutting Disc
(see figure A)
 When mounting and replacing diamond cutting discs, it
is recommended to wear protective gloves.
 Diamond cutting discs become very hot during opera-
tion; do not touch them until they have cooled down.
 Always use a correctly sized diamond cutting disc with
the fitting mounting hole that corresponds with the in-
formation listed in the technical data.
 Use only diamond-tipped cutting discs. Segmented dia-
mond wheels may only have negative cutting angles
and slots between the segments to a maximum of
10 mm.
Mounting the Diamond Cutting Disc
– Clean the diamond cutting disc 19 and all clamping parts
to be mounted.
– Mount the mounting flange 18 onto the drive spindle 17.
– Place the diamond cutting disc 19 onto the mounting
flange 18. The direction arrow on the diamond cutting disc
19 and the direction-of-rotation arrow on the blade guard
6 must correspond.
– Mount the clamping flange 20 and screw in the clamping
bolt 21.
– Press and hold the spindle lock 13.
– Use the hex key 22 to tighten the clamping bolt 21 (torque
3–5 Nm).
Removal of the Diamond Cutting Disc
– Press and hold the spindle lock 13.
– Use the hex key 22 to remove the clamping bolt 21.
– Remove the clamping flange 20 and diamond cutting disc
19 from the drive spindle 17.
Mounting the Hose Kit (see figure B–C)
 For wet cutting, use only water as the cooling liquid.
Only fasten the hose kit to the power tool using the screw and
the spring washer intended for this purpose.
Screw the hose connection 24 onto the water tap or to the
outlet of a water container. In order to reach the correct water
pressure, the water container must be positioned at least
80 cm above the working surface of the power tool.
Bosch Power Tools
Mount connection hose 23 onto hose fitting 5. Check the tight
seating by pulling on the connection hose.
Regulate the outflowing water quantity via water tap 25 be-
fore putting the power tool into operation.
The maximum permissible water pressure is 0.12 MPa.
Operation

Operating Modes

 Before any work on the machine itself, pull the mains
plug.
Pre-selecting the Cutting Depth (see figure D)
 The cutting depth may only be pre-selected when the
machine is switched off.
Adapt the cutting depth to the thickness of the workpiece. For
optimum results, the diamond cutting disc must protrude ap-
prox. 2 mm out of the material.
Loosen wing bolt 4. For a smaller cutting depth, pull the ma-
chine from the base plate 8; for a larger cutting depth, push
the machine toward the base plate 8. Adjust the desired cut-
ting depth at the cutting-depth scale 3. Tighten wing bolt 4
again.
Adjusting the Cutting Angle (see figure E)
Loosen wing bolt 8. Tilt the machine sidewards until the de-
sired cutting angle is set on the scale 10. Tighten wing bolt 8
again.
Note: For bevel cuts, the cutting depth is smaller than the set-
ting indicated on the cutting-depth scale 3.
0 cutting mark° (see figure F)
The 0° cutting mark (7) indicates the position of the diamond
cutting disc for straight cuts.

Starting Operation

 Observe correct mains voltage! The voltage of the pow-
er 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.
Residual Current Device (RCD)
Check the function of the residual current device (RCD) each
time before starting the operation of the tool!
– Switch the power tool off.
– Insert the mains plug and press the RESET button on the
residual current device (RCD) 14 until the indicator 15
lights up red.
– Press the TEST button on the residual current device
(RCD) 14 until the indicator 15 disappears. If the indicator
15 does not disappear, then the residual current device
(RCD) is faulty and must be repaired.Under no circum-
stances work with the power tool!
– Once the indicator 15 goes off, press the RESET button
again.
– Switch on the machine.
English | 17
1 609 92A 0Y3 | (4.2.15)