Operating Modes; Starting Operation; Working Advice - Bosch GKS Professional 55 Manual Original

OBJ_BUCH-244-004.book Page 18 Friday, April 8, 2011 10:03 AM
18 | English
Operation

Operating Modes

Before any work on the machine itself, pull the mains
plug.
Adjusting the Cutting Depth (see figure C)
Adjust the cutting depth to the thickness of the work-
piece. Less than a full tooth of the blade teeth should be
visible below the workpiece.
Loosen the clamping lever 26. For a smaller cutting depth,
pull the saw away from the base plate 15; for a larger cutting
depth, push the saw toward the base plate 15. Adjust the de-
sired cutting depth at the cutting-depth scale. Tighten the
clamping lever 26 again. The tightening tension of the clamping lever 26 can be read-
justed. For this, unscrew the clamping lever 26, and screw it
back again turned offset by at least 30° in anticlockwise direc-
tion.
Adjusting the Cutting Angle
It is best to place the machine on the face side of the blade
guard 18.
Loosen the wing bolts 8 and 16. Tilt the saw sidewards. Ad-
just the desired measure on the scale 6. Tighten the wing
bolts 8 and 16 again.
Note: For bevel cuts, the cutting depth is smaller than the set-
ting indicated on the cutting-depth scale 27.
Cutting Marks
The 0° cutting mark (9) indicates the position of the saw
blade for straight cuts. The 45° cutting mark (10) indicates
the position of the saw blade for 45° cuts without using the
guide rail.

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.
Switching On and Off
To start the machine, first push the lock-off button for the
On/Off switch 2 and then press the On/Off switch 1 and keep
it pressed.
To switch off the machine, release the On/Off switch 1.
Note: For safety reasons, the On/Off switch 1 cannot be
locked; it must remain pressed during the entire operation.
Reduced starting current (GKS 55 GCE)
The electronic reduced starting current limits the power con-
sumption when switching the tool on and enables operation
from a 13 ampere fuse.
Constant Electronic Control (GKS 55 GCE)
Constant electronic control holds the speed constant at no-
load and under load, and ensures uniform working perform-
ance.
2 609 932 800 | (8.4.11)
Speed preselection (GKS 55 GCE)
The required speed can be preselected with the thumbwheel
3 (also while running).
The required speed depends on the saw blade being used and
on the material being worked (see overview of saw blades at
the end of these operating instructions).

Working Advice

Protect saw blades against impact and shock. Guide the machine evenly and with light feed in the cutting di-
rection. Excessive feed significantly reduces the service life of
the saw blade and can cause damage to the power tool.
Sawing performance and cutting quality depend essentially
on the condition and the tooth form of the saw blade. There-
fore, use only sharp saw blades that are suited for the material
to be worked.
Sawing Wood
The correct selection of the saw blade depends on the type
and quality of the wood and whether lengthway or crossway
cuts are required.
When cutting spruce lengthways, long spiral chips are
formed.
Beech and oak dusts are especially detrimental to health.
Therefore, work only with dust extraction.
Sawing Plastic (GKS 55 GCE)
Note: When sawing plastic, especially PVC, long spiral chips
are formed that can be electrostatically charged. This can clog
the sawdust ejector 17 and cause the retracting blade guard
13 to jam. It is best to work with dust extraction.
Guide the switched on power tool against the workpiece and
carefully start the cut. Continue the cut with low feed and
without interruption, so that the saw teeth do not gum up too
quickly.
Sawing Non-ferrous Metals
Note: Use only a sharp saw blade that is suitable for non-fer-
rous metals. This ensures a clean cut and prevents blade bind-
ing.
Guide the switched on power tool against the workpiece and
carefully start the cut. Continue the cut with low feed and
without interruption.
When sawing profiles, always begin the cut from the narrow
side; when sawing U-profiles, never start the cut from the
open side. Support long profiles in order to avoid blade bind-
ing and kickback of the power tool.
Sawing Light Building Materials (Materials with Mineral
Content) (GKS 55 GCE)
When sawing light building materials, observe the stat-
utory provisions and the recommendations of the ma-
terial suppliers.
Light building materials may only be sawn dry and when ap-
plying dust extraction. Always work with the guide rail 29 (ac-
cessory).
The vacuum cleaner must be approved for the extraction of
masonry dust. Bosch provides suitable vacuum cleaners.
Bosch Power Tools