35
EnGLIsh
thin workpiece may wedge under the rip fence and create
a kickback.
3) Kickback Causes and Related Warnings
Kickback is a sudden reaction of the workpiece due to a pinched,
jammed saw blade or misaligned line of cut in the workpiece with
respect to the saw blade or when a part of the workpiece binds
between the saw blade and the rip fence or other fixed object.
Most frequently during kickback, the workpiece is lifted from the
table by the rear portion of the saw blade and is propelled towards
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 )
Never stand directly in line with the saw blade.
Always position your body on the same side of
the saw blade as the fence.
Kickback may propel the
workpiece at high velocity towards anyone standing in
front and in line with the saw blade.
b )
Never reach over or in back of the saw blade to pull
or to support the workpiece.
Accidental contact with
the saw blade may occur or kickback may drag your
fingers into the saw blade.
c )
Never hold and press the workpiece that is being
cut off against the rotating saw blade.
Pressing the
workpiece being cut off against the saw blade will create a
binding condition and kickback.
d )
Align the fence to be parallel with the saw blade.
A
misaligned fence will pinch the workpiece against the saw
blade and create kickback.
e )
Use a featherboard to guide the workpiece against
the table and fence when making non-through cuts
such as rabbeting or resawing cuts.
A featherboard
helps to control the workpiece in the event of a kickback.
f )
Use extra caution when making a cut into blind
areas of assembled workpieces.
The protruding saw
blade may cut objects that can cause kickback.
g )
Support large panels to minimise the risk of saw
blade pinching and kickback.
Large panels tend to sag
under their own weight. Support(s) must be placed under
all portions of the panel overhanging the table top.
h )
Use extra caution when cutting a workpiece that is
twisted, knotted, warped or does not have a straight
edge to guide it with a mitre gauge or along the
fence.
A warped, knotted, or twisted workpiece is unstable
and causes misalignment of the kerf with the saw blade,
binding and kickback.
i )
Never cut more than one workpiece, stacked
vertically or horizontally.
The saw blade could pick up
one or more pieces and cause kickback.
j )
When restarting the saw with the saw blade in the
workpiece, centre the saw blade in the kerf so that
the saw teeth are not engaged in the material.
If the
saw blade binds, it may lift up the workpiece and cause
kickback when the saw is restarted.
k )
Keep saw blades clean, sharp, and with sufficient
set. Never use warped saw blades or saw blades with
cracked or broken teeth.
Sharp and properly set saw
blades minimise binding, stalling and kickback.
4) Table Saw Operating Procedure Warnings
a )
Turn off the table saw and disconnect the power
cord when removing the table insert, changing
the saw blade or making adjustments to the riving
knife, or saw blade guard, and when the machine
is left unattended.
Precautionary measures will
avoid accidents.
b )
Never leave the table saw running unattended.
Turn it off and don’t leave the tool until it comes
to a complete stop.
An unattended running saw is an
uncontrolled hazard.
c )
Locate the table saw in a well-lit and level area
where you can maintain good footing and balance.
It should be installed in an area that provides
enough room to easily handle the size of your
workpiece.
Cramped, dark areas, and uneven slippery
floors invite accidents.
d )
Frequently clean and remove sawdust from under
the saw table and/or the dust collection device.
Accumulated sawdust is combustible and may self-ignite.
e )
The table saw must be secured.
A table saw that is not
properly secured may move or tip over.
f )
Remove tools, wood scraps, etc. from the table
before the table saw is turned on.
Distraction or a
potential jam can be dangerous.
g )
Always use saw blades with correct size and shape
(diamond versus round) of arbour holes.
Saw blades
that do not match the mounting hardware of the saw will
run off-centre, causing loss of control.
h )
Never use damaged or incorrect saw blade mounting
means such as flanges, saw blade washers, bolts or
nuts.
These mounting means were specially designed for
your saw, for safe operation and optimum performance.
i )
Never stand on the table saw, do not use it as a
stepping stool.
Serious injury could occur if the tool is
tipped or if the cutting tool is accidentally contacted.
j )
Make sure that the saw blade is installed to rotate
in the proper direction. Do not use grinding wheels,
wire brushes, or abrasive wheels on a table saw.
Improper saw blade installation or use of accessories not
recommended may cause serious injury.
Additional Safety Rules for Saw Benches
WARNING:
Cutting plastics, sap coated wood, and other
materials may cause melted material to accumulate on
the blade tips and the body of the saw blade, increasing
the risk of blade overheating and binding while cutting.
• Make sure that the blade rotates in the correct direction and
that the teeth are pointing to the front of the saw bench.
• Be sure all clamp handles are tight before starting
any operation.
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