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full tooth of the blade teeth should be visible below the work piece.
d) Never hold piece being cut in your hands or across your leg. Secure
the work piece to a stable platform
. It is important to support the work
properly to minimize body exposure, blade binding, or loss of control.
e) Hold power 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 also make exposed metal parts of the
power tool ‘live’ and shock the operator.
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
arbor holes.
Blades that do not match the mounting hardware of the saw
will run eccentrically, 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.
Causes and operator prevention of kickback
- kickback is 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 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 if the wood causing the blade
to climb out the kerf and jump back toward the operator.
Kickback is the result of saw misuse and/or incorrect operation
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
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
kerfs 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 minimize 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 kerfs 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 making a ‘plunge cut’ into existing walls or
other blind areas.
The protruding blade may cut objects that can cause
kickback.
Safety instructions for saws with inner pendulum 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.
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 ware of the time it
takes for the blade to stop after switch is released.
Summary of Contents for 241-0428
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