Makita 4100NS Manuel D'instruction page 4

CAUTION: Wheels coast after turn off.
4. Always observe that the wheel has stopped
spinning before placing tool down on bench
or floor. A coasting wheel will cause the tool to
walk backwards, cutting whatever is in its path. Be
aware of the time it takes for the wheel to stop after
switch is released.
5. NEVER hold piece being cut in your hands or
across your leg. It is important to support the
work properly to minimize body exposure, wheel
binding, or loss of control.
6. Hold tool by insulated gripping surfaces when
performing an operation where the cutting tool
may contact hidden wiring or its own cord.
Contact with a "live" wire will make exposed metal
parts of the tool "live" and shock the operator.
7. When ripping always use a rip fence or
straight edge guide. This improves the accuracy
of cut and reduces the chance for wheel binding.
8. Always use wheels with correct size and
shape (diamond vs. round) arbor holes.
Wheels that do not match the mounting hardware
of the tool will run eccentrically, causing loss of
control.
9. Never use damaged or incorrect wheel
washers or bolts. The wheel washers and bolt
were specially designed for your tool, for optimum
performance and safety of operation.
10. Causes and Operator Prevention of Kickback:
Kickback is a sudden reaction to a pinched, bound,
or misaligned wheel, causing an uncontrolled tool
to lift up and out of the workpiece toward the
operator.
When the wheel is pinched or bound tightly by the
kerf closing down, the wheel stalls and the motor
reaction drives the unit rapidly back toward the
operator.
If the wheel becomes twisted or misaligned in the
cut, the teeth at the back edge of the wheel can dig
into the top surface of the material being cut
causing the wheel to climb out of the kerf and jump
back toward the operator.
Kickback is the result of tool misuse and/or
incorrect operating procedures or conditions and
can be avoided by taking proper precautions as
given below:
Maintain a firm grip on the tool and position
your body and arm to allow you to resist
KICKBACK forces. KICKBACK forces can be
controlled by the operator, if proper precautions are
taken.
When wheel is binding, or when interrupting a
cut for any reason, release the trigger and hold
the tool motionless in the material until the
wheel comes to a complete stop. Never attempt
to remove the tool from the work or pull the
tool backward while the wheel is in motion or
KICKBACK may occur. Investigate and take
corrective actions to eliminate the cause of wheel
binding.
When restarting a tool in the workpiece, center
the wheel in the kerf and check that teeth are
not engaged into the material. If wheel is binding,
it may walk up or KICKBACK from the workpiece as
the tool is restarted.
Support large panels to minimize the risk of
wheel 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.
To minimize the risk of blade pinching and kickback.
When cutting operation requires the resting of the
tool on the workpiece, the tool should be rested on
the larger portion and the smaller piece cut off.
Do not use
Unsharpened or improperly set wheels produce
narrow kerf causing excessive friction, wheel
binding and KICKBACK.
Wheel depth and bevel adjusting locking levers
must be tight and secure before making cut. If
wheel adjustment shifts while cutting, it may cause
binding and KICKBACK.
Use extra caution when making a "Pocket Cut"
into existing walls or other blind areas. The
protruding wheel may cut objects that can cause
KICKBACK.
NEVER place your hand or fingers behind the
tool. If kickback occurs, the tool could easily jump
backwards over your hand, leading to serious
personal injury.
11. When operating the tool, keep the cord away
from the cutting area and position it so that it
will not be caught on the workpiece during the
cutting operation. Operate with proper hand
support, proper workpiece
supply cord routing away from the work area.
WARNING: It is important to support the
workpiece properly and to hold the tool firmly
to prevent loss of control which could cause
personal injury.
12. Use only diamond wheels. NEVER use tool
with wood cutting blades or other sawblades.
Such blades when used on this tool frequently
kick and cause loss of control leading to
personal injury.
13. Check the wheel carefully for cracks or
damage before operation. Replace cracked or
damaged wheel immediately.
14. Use only flanges specified for this tool.
4
dull or damaged
support,
wheel.
and