Bosch GBH 2-21 Professional Notice Originale page 15

– Pull the depth stop far enough out that the distance
between the drill bit tip and the edge of the depth stop
corresponds to the required drilling depth X.
Selecting Drill Chucks and Tools
Hammer drilling and chiselling require SDS-plus application
tools that are inserted into the SDS-plus drill chuck.
For drilling without impact in wood, metal, ceramic and
plastic as well as for screwdriving, tools without SDS‑plus
are used (e.g. cylindrical shank drill bits). For these tools, a
keyless chuck or a keyed chuck are required.
Inserting/removing the keyless chuck/keyed
chuck
Fitting the keyless chuck/keyed chuck (see figure C)
– Screw the SDS-plus shank (17) into a keyless chuck (1)/
keyed chuck (16). Secure the keyless chuck (1)/keyed
chuck (16) using the securing screw (15). Note that the
securing screw has a left-hand thread.
Inserting the keyless chuck/keyed chuck (see figure C)
– Clean and lightly grease the insertion end of the shank.
– Insert the keyless chuck/keyed chuck with the adapter
shank into the tool holder with a turning motion until it
automatically locks.
– Check that it is locked by pulling the keyless chuck/keyed
chuck.
Removing the keyless chuck/keyed chuck
– Push the locking sleeve (5) back and remove the keyless
chuck (1)/keyed chuck (16).
Changing the Tool
The dust protection cap (4) largely prevents the penetration
of drilling dust into the tool holder during operation. When
inserting the tool, make sure that the dust protection cap (4)
does not become damaged.
Replace a damaged dust protection cap immediately.
u
It is recommended that you have use an after-sales
service for this.
Changing the tool (SDS plus)
Inserting SDS-plus application tools (see figure D)
The SDS-plus drill chuck enables you to change the applica-
tion tool easily and conveniently without needing to use ad-
ditional tools.
– Clean and lightly grease the insertion end of the applica-
tion tool.
– Insert the application tool into the tool holder while turn-
ing it until it locks automatically.
– Check the latching by pulling the tool.
As a requirement of the system, the SDS-plus application
tool can move freely. This causes a certain radial run-out at
no-load, which has no effect on the accuracy of the drill hole,
as the drill bit centres itself upon drilling.
Bosch Power Tools
Removing SDS-plus application tools (see figure E)
– Push the locking sleeve (5) back and remove the applica-
tion tool.
Changing the tool (without SDS plus)
Inserting the application tool (see figure F)
Note: Application tools that do not have SDS plus must not
be used for hammer drilling or chiselling. Tools without SDS
plus and their drill chucks are damaged by hammer drilling
or chiselling.
– Insert the keyless chuck (1).
– Hold the rear sleeve (19) of the keyless chuck (1) firmly
and turn the front sleeve (18) anti-clockwise until the tool
can be inserted. Insert the tool.
– Hold the rear sleeve of the keyless chuck (1) and firmly
tighten the front sleeve by hand in a clockwise direction
until it stops clicking. This will automatically lock the drill
chuck.
– Check that it is seated securely by pulling the tool.
Note: If the tool holder was unscrewed all the way, a scrap-
ing sound may be heard while retightening the tool holder
and it may not fully tighten.
In this case, turn the front sleeve in the opposite direction to
the arrow by one full turn. This will allow the tool holder to be
fully tightened.
– Turn the impact/mode selector switch (10) to the
"drilling" position.
Removing the application tool (see figure G)
– Hold the rear sleeve (19) of the keyless chuck firmly in
place. Open the tool holder by turning the front sleeve in
the direction of the arrow until the tool can be removed.
Dust/Chip Extraction
The dust from materials such as lead paint, some types of
wood, minerals and metal can be harmful to human health.
Touching or breathing in this dust can trigger allergic reac-
tions and/or cause respiratory illnesses in the user or in
people in the near vicinity.
Certain dusts, such as oak or beech dust, are classified as
carcinogenic, especially in conjunction with wood treatment
additives (chromate, wood preservative). Materials contain-
ing asbestos may only be machined by specialists.
– Use a dust extraction system that is suitable for the ma-
terial wherever possible.
– Provide good ventilation at the workplace.
– It is advisable to wear a P2 filter class breathing mask.
The regulations on the material being machined that apply in
the country of use must be observed.
Avoid dust accumulation at the workplace. Dust can
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easily ignite.
Dust extraction with GDE 16 Plus/GDE 68
(accessory)
A GDE 16 Plus (accessory) or GDE 68 (accessory) is re-
quired for dust extraction.
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1 609 92A 5SR | (20.08.2020)