Bosch GGS Professional 8 CE Manual Original página 18

OBJ_BUCH-1269-003.book Page 18 Thursday, December 16, 2010 4:05 PM
18 | English
For example, if an abrasive wheel is snagged
or pinched by the workpiece, the edge of the
wheel that is entering into the pinch point
can dig into the surface of the material caus-
ing the wheel to climb out or kick out. The
wheel may either jump toward or away from
the operator, depending on direction of the
wheel's movement at the point of pinching.
Abrasive wheels may also break under these
conditions.
Kickback is the result of power tool misuse
and/or incorrect operating procedures or
conditions and can be avoided by taking
proper precautions as given below.
Maintain a firm grip on the power tool and
position your body and arm to allow you to
resist kickback forces. The operator can
control kickback forces, if proper precau-
tions are taken.
Use special care when working corners,
sharp edges, etc. Avoid bouncing and snag-
ging the accessory. Corners, sharp edges or
bouncing have a tendency to snag the rotat-
ing accessory and cause loss of control or
kickback.
Do not attach a thin toothed saw blade.
Such blades create frequent kickback and
loss of control.
Always feed the bit into the material in the
same direction as the cutting edge is exiting
from the material (which is the same direc-
tion as the chips are thrown). Feeding the
tool in the wrong direction causes the cutting
edge of the bit to climb out of the work and
pull the tool in the direction of this feed.
When using cut-off wheels, high-speed cut-
ters or tungsten carbide cutters, always
have the work securely clamped. These
wheels will grab if they become slightly cant-
ed in the groove, and can kickback. When a
cut-off wheel grabs, the wheel itself usually
breaks. When the steel saw, high-speed cut-
ters or tungsten carbide cutter grab, it may
jump from the groove and you could lose
control of the tool.
3 609 929 C06 | (16.12.10)
Additional safety instructions for grinding
Use only wheel types that are recommend-
ed for your power tool and only for recom-
mended applications. For example: do not
grind with the side of a cut-off wheel. Abra-
sive cut-off wheels are intended for peripher-
al grinding, side forces applied to these
wheels may cause them to shatter.
For threaded abrasive cones and plugs use
only undamaged wheel mandrels with an
unrelieved shoulder flange that are of cor-
rect size and length. Proper mandrels will re-
duce the possibility of breakage.
Do not "jam" the cut-off wheel or apply ex-
cessive pressure. Do not attempt to make
an excessive depth of cut. Overstressing the
wheel increases the loading and susceptibili-
ty to twisting or binding of the wheel in the
cut and the possibility of kickback or wheel
breakage.
Do not position your hand in line with and
behind the rotating wheel. When the wheel,
at the point of operation, is moving away
from your hand, the possible kickback may
propel the spinning wheel and the power
tool directly at you.
When wheel is binding or when interrupting
a cut for any reason, switch off the power
tool and hold the power tool motionless un-
til the wheel comes to a complete stop. Nev-
er attempt to remove the cut-off wheel from
the cut while the wheel is in motion other-
wise kickback may occur. Investigate and
take corrective action to eliminate the cause
of wheel binding.
Do not restart the cutting operation in the
workpiece. Let the wheel reach full speed
and carefully reenter the cut. The wheel may
bind, walk up or kickback if the power tool is
restarted in the workpiece.
Support panels or any oversized workpiece
to minimize the risk of wheel pinching and
kickback. Large workpieces tend to sag un-
der their own weight. Supports must be
placed under the workpiece near the line of
cut and near the edge of the workpiece on
both sides of the wheel.
Bosch Power Tools