Berner BACCS-18V, Instruction Manual

Page: 22 / 276

22
E N G L I S H
Causes and Operator Prevention of
Kickback
– Kickback is a sudden reaction to a pinched, bound
or misaligned saw blade, causing an uncontrolled
saw to lift up and out of the work piece toward the
operator;
– When the blade is pinched or bound tightly 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
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 fi rm 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 interrupting
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 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 kickback from
the work piece 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 locking levers
must be tight and secure before making cut.
If
blade adjustment shifts while cutting, it may cause
binding and kickback.
g) The BACCS-18V has no plunge cutting function!
Safety instructions for saws with
a pendulum blade 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
retracting 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 should be retracted manually
only for special cuts such as “plunge cuts”
and “compound cuts”. Raise lower guard by
retracting handle and as soon as blade enters
the material, the lower guard must be released.
For all other sawing, the lower guard should
operate automatically.
d) Always observe that the lower guard is
covering the blade before placing saw down on
bench or fl oor.
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.
Additional safety instructions for circular
saws
• Wear ear protectors. Exposure to noise can
cause hearing loss.
• Wear a dust mask. Exposure to dust particles can
cause breathing diffi culty and possible injury.
• Do not use blades of larger or smaller diameter
than recommended.
For the proper blade rating
refer to the technical data. Use only the blades
specifi ed in this manual, complying with EN 847-1.
• Never use abrasive cut-off wheels .
• Ensure that the riving knife is adjusted so that the
distance between the riving knive and the rim of
the blade is not more than 5 mm, and the rim of the
blade does not extend more than 5 mm beyond the
lowest edge of the riving knife.
Additional safety instructions for all saws
with riving knife
a) Use the appropriate riving knife for the blade
being used. For the riving knife to work, it must be