Hilti WSC 85 Mode D'emploi page 15

c) Adjust the cutting depth to the thick-
ness of the workpiece. Less than a full
tooth of the blade teeth should be visi-
ble below the workpiece.
d) Never hold piece being cut in your
hands or across your leg. Secure the
workpiece to a stable platform. It is
important to support the work properly
to minimize body exposure, blade bind-
ing, or loss of control.
e) Hold the power tool by insulated grip-
ping surfaces only, when performing
an operation where the cutting tool
may contact hidden wiring or its own
cord. Contact 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 mounting hardware of the saw will
run eccentrically, causing loss of con-
trol.
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.
1.2.2 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-
Printed: 14.05.2014 | Doc-Nr: PUB / 5071333 / 000 / 02
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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 mis-
aligned 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 operator.
Kickback is the result of saw misuse
and/or incorrect operating procedures or
conditions and can be avoided by taking
proper precautions 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 back-
wards, but kickback forces can be con-
trolled by the operator, if proper pre-
cautions are taken.
b) When blade is binding, or when inter-
rupting a cut for any reason, release
the trigger and hold the saw motion-
less 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 cor-
rective actions to eliminate the cause of
blade binding.
c) When restarting a saw in the work-
piece, 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 kick-
back 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 panel 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 lock-
ing levers must be tight and secure
before making cut. If blade adjustment
shifts while cutting, it may cause bind-
ing and kickback.
g) Use extra caution when sawing into
existing walls or other blind areas.
The protruding blade may cut objects
that can cause kickback.
1.2.3 Safety instructions for circular
saws with a lower guard
Function of the lower guard
a) Check lower guard for proper closing
before each use. Do not operate the
saw if lower guard does not move
freely and close instantly. Never
clamp or tie the lower guard into the
open position. If saw is accidentally
dropped, lower guard may be bent.
Raise the lower guard with the retract-
ing handle and make sure it moves
freely and does not touch the blade or
any other part, in all angles and depths
of cut.
b) Check the operation of the lower
guard spring. If the guard and the
spring are not operating properly,
they must be serviced before use.
Lower guard may operate sluggishly
due to damaged parts, gummy
deposits, or a build-up of debris.
c) Lower guard may be retracted manu-
ally only for special cuts such as
"plunge cuts" and "compound cuts."
Raise lower guard by retracting han-
dle and as soon as blade enters the
material, the lower guard must be
released. For all other sawing, the low-
er guard should operate automatically.
d) Always observe that the lower guard
is covering the blade before placing
saw down on bench or floor. An
unprotected, coasting blade will cause
the saw to walk backwards, cutting
whatever is in its path. Be aware of the
time it takes for the blade to stop after
switch is released.
1.2.4 Additional safety instructions for all
saws with a riving knife
Function of the riving knife
a) Use the appropriate saw blade for the
riving knife. For the riving knife to
function, the body of the blade must be
thinner than the riving knife and the
cutting width of the blade must be
wider than the thickness of the riving
knife.
b) Adjust the riving knife as described in
this instruction manual. Incorrect
spacing, positioning and alignment can
make the riving knife ineffective in pre-
venting kickback.
c) Always use the riving knife except
when plunge cutting. Riving knife must
be replaced after plunge cutting. Riving
knife causes interference during plunge
cutting and can create kickback.
d) For the riving knife to work, it must be
engaged in the workpiece. The riving
knife is ineffective in preventing kick-
back during short cuts.
e) Do not operate the saw if riving knife
is bent. Even a light interference can
slow the closing rate of a guard.
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