11
VI
English
Kickback and Related Warnings
Kickback is a sudden reaction to a pinched or snagged rotating
wheel, backing pad, brush or any other accessory. Pinching or snag-
ging causes rapid stalling of the rotating accessory which in turn
causes the uncontrolled power tool to be forced in the direction
opposite of the accessory’s rotation at the point of the binding.
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 causing 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 opera-
ting procedures or conditions and can be avoided by taking proper
precautions as given below.
a) Maintain a firm grip on the power tool and position your
body and arm to allow you to resist kickback forces. Always
use auxiliary handle, if provided, for maximum control over
kickback or torque reaction during start-up.
The operator can
control torque reactions or kickback forces, if proper precautions
are taken.
b) Use special care when working corners, sharp edges etc.
Avoid bouncing and snagging the accessory.
Corners, sharp
edges or bouncing have a tendency to snag the rotating accessory
and cause loss of control or kickback.
c) Do not attach a toothed saw blade.
Such blades create
frequent kickback and loss of control.
d) Always feed the bit into the material in the same direc-
tion as the cutting edge is exiting from the material (which
is the same direction 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.
e) When using rotary files, cut-off wheels, high-speed
cutters or tungsten carbide cutters, always have the work
securely clamped.
These wheels will grab if they become slightly
canted in the groove, and can kickback. When a cut-off wheel grabs,
the wheel itself usually breaks. When a rotary file, high-speed cutter
or tungsten carbide cutter grabs, it may jump from the groove and
you could lose control of the tool.
Safety Warnings Specific for Grinding and Abrasive Cutting-
Off Operations
a) Use only wheel types that are recommended for your
power tool and only for recommended applications. For
example do not grind with the side of a cut-off wheel.
Abra-
sive cut-off wheels are intended for peripheral grinding, side forces
applied to these wheels may cause them to shatter.
b) For threaded abrasive cones and plugs use only undama-
ged wheel mandrels with an unrelieved shoulder flange that
are of correct size and length.
Proper mandrels will reduce the
possibility of breakage.
c) Do not “jam” the cut-off wheel or apply excessive
pressure. Do not attempt to make an excessive depth of
cut.
Overstressing the wheel increases the loading and susceptibility
to twisting or binding of the wheel in the cut and the possibility of
kickback or wheel breakage.
d) 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.
e) When wheel is binding or when interrupting a cut for any
reason, switch off the power tool and hold the power tool
motionless until the wheel comes to a complete stop. Never
attempt to remove the cut-off wheel from the cut while the
wheel is in motion otherwise kickback may occur.
Investigate
and take corrective action to eliminate the cause of wheel binding.
f) Do not restart the cutting operation in the workpiece. Let
the wheel reach full speed and carefully re-enter the cut.
The
wheel may bind, walk up or kickback if the power tool is restarted in
the workpiece.
g) Support panels or any oversized workpiece to minimize the
risk of wheel pinching and kickback.
Large workpieces tend to sag
under 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.
h) Use extra caution when sawing into existing walls or other
blind areas.
The protruding wheel may cut gas or water pipes,
electrical wiring or objects that can cause kickback.
Safety Warnings Specific for Sanding Operations
a) Do not use excessively oversized sanding disc paper.
Follow manufacturers recommendations, when selecting
sanding paper.
Larger sanding paper extending beyond the
sanding pad presents a laceration hazard and may cause snagging,
tearing of the disc or kickback.
Safety Warnings Specific for Wire Brushing Operations
a) Be aware that wire bristles are thrown by the brush
even during ordinary operation. Do not overstress the wires
by applying excessive load to the brush.
The wire bristles can
easily penetrate light clothing and/or skin.
b) Allow brushes to run at operating speed for at least one
minute before using them. During this time no one is to
stand in front or in line with the brush.
Loose bristles or wires
will be discharged during the run-in time.
c) Direct the discharge of the spinning wire brush away
from you.
Small particles and tiny wire fragments may be discharged
at high velocity during the use of these brushes and may become
imbedded in your skin.
ADDITIONAL SAFETY AND WORKING INSTRUCTIONS
When grinding metal, flying sparks are produced. Take care that
no persons are endangered. Because of the danger of fire, no
combustible materials should be located in the vicinity (spark flight
zone). Do not use dust extraction.
Avoid flying sparks and sanding dust hit your body.
Only use properly fitting and undamaged open-end spanners.
The insertion tools must run completely concentrical. Do not con-
tinue to use out-of-round insertion tools, instead, replace before
continuing to work.
Never reach into the danger area of the machine when it is running.
Chips and splinters must not be removed while the machine is
running.
Immediately switch off the machine in case of considerable vibra-
tions or if other malfunctions occur. Check the machine in order to
find out the cause.
Make sure that the insertion tool comes to a complete stop before
laying it down.
Under extreme conditions (e.g. smooth-grinding metals with the
arbour and vulcanized fibre grinding wheel), significant contami-
nation can build up on the inside of the die grinder.
