Dust/Chip Extraction; Maintenance And Service; Maintenance And Cleaning - Bosch GBG 60-20 Professional Originalbetriebsanleitung

OBJ_BUCH-3096-002.book Page 14 Friday, June 2, 2017 5:02 PM
14 | English
Changing a Grinding Wheel
 Before any work on the machine itself, pull the mains
plug.
 The rated speed of the accessory must be at least equal
to the maximum speed marked on the power tool. Ac-
cessories running faster than their rated speed can break
and fly apart.
 Grinding wheels whose diameter exceeds the specifi-
cation on the power tool are not permitted.
Replace the grinding wheel when the holder of the spark
guard 10 can no longer be adjusted to the required clearance
of 2 mm (max.) to the grinding wheel.
– Loosen the 3 screws of cover 1 and remove cover 1. Hold
the grinder spindle 5 with open-end spanner 9 and un-
screw the clamping nut 2 from the grinder spindle 5.
Note: The grinder spindle 5 on the left side of the machine has
a left-hand thread.
– Remove the clamping flange 3 and the grinding wheel from
the grinder spindle 5.
– The new grinding wheel is mounted in reverse order. Place
the cover 1 firmly onto the housing and tighten with the 3
screws.
 Use the power tool only with application tools which
are mounted on both spindles. This will prevent contact
with the rotating spindle.
Dress used and out-of-centre grinding wheels with a whet-
stone (accessory) before continuing to use them.

Dust/Chip Extraction

 Dust 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 dust can cause
allergic reactions and/or lead to respiratory infections of
the user or bystanders.
Certain dust, such as oak or beech dust, is considered car-
cinogenic, especially in connection with wood-treatment
additives (chromate, wood preservative). Materials con-
taining asbestos may only be worked by specialists.
– Provide for good ventilation of the working place.
– It is recommended to wear a P2 filter-class respirator.
Observe the relevant regulations in your country for the
materials to be worked.
 Prevent dust accumulation at the workplace. Dust can
easily ignite.
Operation
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.
 Check the grinding tools before using. The grinding
tools must be properly mounted and must rotate freely.
Carry out a 1 minute (minimum) test run at maximum
speed in a safe environment with no load. Do not use
1 609 92A 3NU | (2.6.17)
damaged, out-of-centre or vibrating grinding tools.
Damaged grinding tools can burst and cause injuries.
Products sold in AUS and NZ only: Use a residual current de-
vice (RCD) with a rated residual current of 30 mA or less.
Switching On and Off
To save energy, only switch the power tool on when using it.
– To start the machine, push the On/Off switch 8 to the "I"
position.
– To switch off the machine, push the On/Off switch 8 to the
"0" position.
Working Advice
 Wear a work apron. Pay attention that other persons
are not put at risk from sparking. Remove flammable
materials in close vicinity. Sparking occurs when cutting
metal.
 Never reach into the running grinding wheel of the ma-
chine. This can lead to serious injuries.
 Guide the workpiece only against the switched-on ma-
chine and do not switch the machine off until after hav-
ing removed the workpiece. The workpiece can move
suddenly.
Use silicon carbide grinding discs C (accessory) when work-
ing carbide (TC) workpieces.
– Place the workpiece subject to grinding onto the work-
piece support 12 and press it moderately against the
grinding wheel. To achieve optimal grinding results, lightly
move the workpiece back and forth. This also ensures that
the grinding wheel is worn off evenly.
– Occasionally cool off the workpiece in water.
Transport
– Remove all accessories that cannot be mounted firmly to
the power tool.
– Wind up the network cable completely and tie it together.
– To lift or transport the power tool, hold it from below by the
two protective guards 6. You can support the power tool in
the area of the holes for mounting 7.
 Never use the spark arrestor 11 or workpiece support
12 when transporting the power tool.

Maintenance and Service

Maintenance and Cleaning

 Before any work on the machine itself, pull the mains
plug.
 For safe and proper working, always keep the machine
and ventilation slots clean.
If the replacement of the supply cord is necessary, this has to
be done by Bosch or an authorized Bosch service agent in or-
der to avoid a safety hazard.
Bosch Power Tools