Dust/Chip Extraction; Starting Operation; Working Advice - Bosch GKF 550 Professional Notice Originale

14 | English
Open the wing bolt (10) on the routing base (2).
Pull the drive unit out in an upward direction.
Changing the Collet (see figure B)
Depending on the router bit used, you may have to change
the cap nut with the collet (7) before fitting the router bit.
If the right collet for your router bit is already fitted, please
follow the work steps in the following section.
The collet (13) must sit in the cap nut with a small amount of
play. The cap nut (7) must be easy to fit. If the cap nut or col-
let is damaged, replace it immediately.
Place the open-ended spanner (15) on the tool holder (14)
(see figure C1).
Unscrew the cap nut (7) anticlockwise using the open-ended
spanner (16).
If required, clean all the parts you want to fit with a soft
brush or by blowing them clean with compressed air before
assembling them.
Place the new cap nut on the tool holder (14).
Loosely tighten the cap nut.
Do not, under any circumstances, tighten the collet
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with the tightening nut until a router bit has been fit-
ted. The collet may otherwise become damaged.
Fitting the router bit (see figure C1 – C2)
Router bits are available in a wide variety of designs and
qualities depending on the intended application.
Router bits made of high-performance high-speed steel
(HSS) are suited to machining soft materials such as soft-
wood and plastic.
Router bits with carbide tips (HM) are especially suitable
for hard and abrasive materials such as hardwood and alu-
minium.
Original router bits from the extensive range of Bosch ac-
cessories are available from your specialist dealer.
Only use undamaged and clean router bits.
Fitting the routing base (see figure A)
To start routing, the routing base (2) must be fitted back
onto the drive unit (1).
Open the wing bolt (10) on the routing base (2).
Slide the drive unit (1) into the routing base (2).
Close the wing bolt (10) on the routing base (2).
After assembly, always check that the drive unit is
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firmly seated in the routing base.

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 carci-
nogenic, especially in connection with wood-treatment ad-
ditives (chromate, wood preservative). Materials containing
asbestos may only be worked by specialists.
– Provide for good ventilation of the working place.
1 609 92A 5JF | (14.01.2020)
– It is recommended to wear a P2 filter-class respirator.
Observe the relevant regulations in your country for the ma-
terials to be worked.
Avoid dust accumulation at the workplace. Dust can
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easily ignite.
Operation
Products that are only sold in AUS and NZ: Use a resid-
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ual current device (RCD) with a nominal residual current
of 30 mA or less.
Pay attention to the mains voltage. The voltage of the
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power source must match the voltage specified on the
rating plate of the power tool. Power tools marked
with 230 V can also be operated with 220 V.
Setting the routing depth
The routing depth must only be set while the power
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tool is switched off.
To set the rough routing depth, proceed as follows:
– Place the power tool with a fitted router bit onto the work-
piece you want to machine.
– Open the wing bolt (10) on the routing base (2).
– Move the drive unit (1) to the required depth using the
scale for setting the routing depth (12) as a guide.
– Close the wing bolt (10) on the routing base (2).
– Check the routing depth you have set by carrying out a
practical test and correct it if required.

Starting Operation

Switching on/off
To switch on the power tool, set the on/off switch (11) to I.
To switch off the power tool, set the on/off switch (11) to 0.

Working Advice

Protect router bits against shock and impact.
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Pull the plug out of the socket before carrying out any
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work on the power tool.
Routing direction and routing process (see figure D)
Routing must always be carried out with the work-
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piece being moved against the direction in which the
router bit (6) is turning (up cut). If the workpiece is
moved in the same direction as the router bit is turning
(down cut), the power tool may be pulled out of your
hands.
Only use the power tool when the routing base (2) is
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fitted. Losing control of the power tool can cause injur-
ies.
Note: Be aware that the router bit (6) always protrudes
slightly from the base plate (9). Do not damage the template
or the workpiece.
Set the routing depth you want.
Switch on the power tool and guide it to the point you want
to machine.
Bosch Power Tools