Dremel 4300 Operating/Safety Instructions Manual page 5

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Safety Rules for Rotary Tools - (cont.)
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 snagging
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.
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 kickout. 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
Maintain a firm grip on the power tool and
precautions as given below.
position your body and arm to allow you to
resist kickback forces. The operator can
control kickback forces, if proper precautions
Use special care when working corners,
are taken.
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
Do not attach a toothed saw blade. Such
kickback.
blades create frequent kickback and loss of
Always feed the bit into the material in the
control.
same direction 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
When using rotary files, cut-off wheels,
and pull the tool in the direction of this feed.
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.
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Safety warnings specific for
grinding and abrasive
cutting-off operations:
Use only wheel types
recommended for your power tool and only
for recommended applications. For
example: do not grind with the side of a cut-
off wheel. Abrasive cut-off wheels are intended
for peripheral grinding, side forces applied to
For threaded abrasive cones and plugs use
these wheels may cause them to shatter.
only undamaged wheel mandrels with an
unrelieved shoulder flange that are of
correct size and length. Proper mandrels will
Do not ''jam'' a cut-off wheel or apply
reduce the possibility of breakage.
excessive pressure. Do not attempt to make
an excessive depth of cut. Overstressing the
wheel increases the loading and susceptibility
to twisting or snagging of the wheel in the cut
and the possibility of kickback or wheel
Do not position your hand in line with and
breakage.
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
When wheel is pinched, snagged or when
at you.
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 pinching or
Do not restart the cutting operation in the
snagging.
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
Support panels or any oversized workpiece
restarted in the 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
Use extra caution when making a ''pocket
the wheel.
cut'' into existing walls or other blind areas.
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