Working Advice - Bosch GTR Professional 550 Notice Originale

10 | English
Bodyfiller/ Wall/
plaster hardness ceiling
Extremely hard Wall/ceiling

Working Advice

Pull the plug out of the socket before carrying out any
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work on the power tool.
Always wait until the power tool has come to a com-
u
plete stop before placing it down.
Do not put the power tool down on its side. This could
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permanently warp the sanding pad.
This power tool is not suitable for bench-mounted use.
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It must not be clamped into a vice or fastened to a work-
bench, for example.
Sanding Surfaces
Switch the power tool on, place the entire sanding surface
against the surface of the workpiece and apply moderate
pressure as you move the sander over the workpiece.
The material removal rate and sanding result are primarily
determined by the choice of sanding sheet, the preselected
speed setting and the contact pressure.
Only immaculate sanding sheets achieve good sanding per-
formance and make the power tool last longer.
Be sure to apply consistent contact pressure in order to in-
crease the lifetime of the sanding sheets.
Excessively increasing the contact pressure will not lead to
increased sanding performance, rather it will cause more
severe wear of the power tool and of the sanding sheet.
Do not use a sanding sheet for other materials after it has
been used to work on metal.
Use only original Bosch-sanding accessories.
Sanding Close to Edges (see figures F–G)
Thanks to the removable brush segment, you can reduce the
lateral distance between the wall/ceiling and the sanding
pad.
– Press and hold the locking mechanism (12) for the brush
segment (18).
– Swivel the brush segment (18) forwards and remove it.
– To insert, hook the brush segment (18) onto the oppos-
ite side of the locking mechanism (12), and swivel it to-
wards the sanding head (11) until it clicks into place.
Adjusting the Internal/External Airflow
Depending on the vacuum pressure, the perceived tool
weight can be reduced.
You can switch between different air flow operating modes
depending on the intended use. Turn the suction power ad-
justing lever (13) to one of the 3 positions.
1 609 92A 76U | (25.02.2022)
internal/external Suction power
air flow
➀ on uneven sur- 6
faces
➂ on even surfaces 1–3
Switch position
Adjusting suction power
You can adjust the suction power to achieve your preferred
balance between sanding speed and suction power. This
regulation is only possible when the internal airflow is activ-
ated (position ③ in the table above).
Adjust the suction power with the thumbwheel (1):
– 1−5: Low to high suction power, suitable for sanding ceil-
ings
– 6: Highest suction power, suitable for sanding walls
Start with a low suction power (position 1) and increase
slowly, until there is a noticeable contact pressure.
High suction power allows low-fatigue sanding of ceilings
and walls. An excessively high suction power can cause the
power tool to vibrate, which can make handling more diffi-
cult.
Errors – Causes and Corrective Measures
Cause
The drywall sander does not run smoothly or jolts across
the surface.
The suction effect is too
strong.
The bodyfiller material and/
or substrates are hard.
Speed setting Sanding sheet grit
4–6 From P100
Type of airflow Use
① External airflow Ideal for sanding
walls at high sand-
ing speeds and
without vacuum
pressure
② Mixed external Medium sanding
and internal air- performance with
flow vacuum pressure
effect
③ Mixed external Ideal for sanding
and internal air- ceilings at low
flow sanding speeds
but with high va-
cuum pressure
(suction power)
for a low perceived
weight
Corrective measure
Reduce the suction power or
switch to external dust ex-
traction, if necessary.
Reduce the suction power or
switch to external dust ex-
traction, if necessary.
Bosch Power Tools