Hilti DC-SE20 Operating Instructions Manual page 12

of parts and any other condition that may
affect the power tool's operation. If dam-
aged, have the power tool repaired before
use. Many accidents are caused by poorly
maintained power tools.
f) Keep cutting tools sharp and clean. Prop-
erly maintained cutting tools with sharp cutting
edges are less likely to bind and are easier to
control.
g) Use the power tool, accessories and tool
bits etc. in accordance with these instruc-
tions, taking into account the working con-
ditions and the work to be performed. Use
of the power tool for operations different from
those intended could result in a hazardous sit-
uation.
1.5 Service
a) Have your power tool serviced by a quali-
fied repair person using only identical replace-
ment parts. This will ensure that the safety of
the power tool is maintained.
2 Additional safety precautions
2.1 Safety instructions for all saws
DANGER:
a) Keep hands away from cutting area and
the blade. Keep your second hand on
auxiliary handle, or motor housing. If
both hands are holding the saw, they can-
not be cut by the blade.
b)Do not reach underneath the workpiece.
The guard cannot protect you from the
blade below the workpiece.
c) Adjust the cutting depth to the thickness
of the workpiece. Less than a full tooth
of the blade teeth should be visible below
the workpiece.
d)Never hold piece being cut in your hands
or across your leg. Secure the workpiece
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Printed: 08.07.2013 | Doc-Nr: PUB / 5069486 / 000 / 01
to a stable platform. It is important to
support the work properly to minimize
body exposure, blade binding, or loss of
control.
e) Hold the power tool by insulated grip-
ping surfaces only, when performing an
operation where the cutting tool may con-
tact hidden wiring or its own cord. Con-
tact with a "live" wire will also make exposed
metal parts of the power tool "live" and
could give the operator an electric shock.
f) When ripping always use a rip fence or
straight edge guide. This improves the
accuracy of cut and reduces the chance
of blade binding.
g)Always use blades with correct size and
shape (diamond versus round) of arbour
holes. Blades that do not match the mount-
ing hardware of the saw will run eccen-
trically, causing loss of control.
h)Never use damaged or incorrect blade
washers or bolt. The blade washers and
bolt were specially designed for your saw,
for optimum performance and safety of
operation.
2.2 Further safety instructions for all saws
Kickback causes and related warnings:
– kickback is a sudden reaction to a pinched,
bound or misaligned saw blade, causing
an uncontrolled saw to lift up and out of
the workpiece toward the operator;
– when the blade is pinched or bound tight-
ly by the kerf closing down, the blade stalls
and the motor reaction drives the unit
rapidly back toward the operator;
– if the blade becomes twisted or misaligned
in the cut, the teeth at the back edge of the
blade can dig into the top surface of the
wood causing the blade to climb out of
the kerf and jump back toward the oper-
ator.
Kickback is the result of saw misuse and/or
incorrect operating procedures or conditi-
ons and can be avoided by taking proper pre-
cautions as given below.
a) Maintain a firm grip with both hands on
the saw and position your arms to resist
kickback forces. Position your body to
either side of the blade, but not in line
with the blade. Kickback could cause the
saw to jump backwards, but kickback
forces can be controlled by the operator,
if proper precautions are taken.
b)When blade is binding, or when inter-
rupting a cut for any reason, release the
trigger and hold the saw motionless in
the material until the blade comes to a
complete stop. Never attempt to remove
the saw from the work or pull the saw
backward while the blade is in motion
or kickback may occur. Investigate and
take corrective actions to eliminate the
cause of blade binding.
c) When restarting a saw in the workpiece,
centre the saw blade in the kerf and check
that saw teeth are not engaged into the
material. If saw blade is binding, it may
walk up or kickback from the workpiece
as the saw is restarted.
d)Support large panels to minimise the
risk of blade pinching and kickback. Large
panels tend to sag under their own weight.
Supports must be placed under the pan-
el on both sides, near the line of cut and
near the edge of the panel.
e) Do not use dull or damaged blades.
Unsharpened or improperly set blades
produce narrow kerf causing excessive
friction, blade binding and kickback.
f) Blade depth and bevel adjusting locking
levers must be tight and secure before
making cut. If blade adjustment shifts
while cutting, it may cause binding and
kickback.
g)Use extra caution when sawing into exist-
ing walls or other blind areas. The pro-
truding blade may cut objects that can
cause kickback.
2.3 Safety instructions for plung-type cir-
cular saws
a) Check guard for proper closing before
each use. Do not operate the saw if guard
does not move freely and enclose the
blade instantly. Never clamp or tie the
guard sp that the blade is exposed. If
saw is accidentally dropped, guard may
be bent. Check to make sure that guard
moves freely and does not touch the blade
or any other part, in all angles and depths
of cut.
b)Check the operation and condition of the
guard return spring. If the guard and the
spring are not operating properly, they
must be serviced before use. Guard may
operate sluggishly due to damaged parts,
gummy deposits, or a build-up of debris.
c) Assure that the base plate of the saw will
not shift while performing the "plunge
cut" when the blade bevel setting is not
at 90°. Blade shifting sideways will cause
binding and likely kick back.
d)Always observe that the guard is cover-
ing the blade before placing saw down
on bench or floor. An unprotected, coast-
ing blade will cause the saw to walk back-
wards, cutting whatever is in its path. Be
aware of the time it takes for the blade to
stop after switch is released.
2.4 Personal safety
a) Wear ear protection. Excessive noise
may lead to a loss of hearing.
b)Always hold the tool securely, with both
hands on the grips provided. Keep the