7
Kickback and Related Warnings
Kickback is a sudden reaction to a pinched or snagged rotating wheel, backing
pad, brush, or any other accessory. Pinching or snagging causes rapid stalling
of the rotating accessory which in turn causes the uncontrolled power tool to
be forced in the direction
opposite of the accessory’s rotation at the point of the
binding.
For example, if a backing pad is snagged or pinched by the workpiece, the
edge of the pad that is entering into the pinch point can dig into the surface of
the material causing the wheel to climb out or kick out. The wheel may either
jump toward or away from the operator,
depending on direction of the wheel’s
movement at the point of pinching.
Kickback is the result of power tool misuse and/or incorrect operating
procedures or conditions and can be avoided by taking proper precautions as
given below.
a)
Maintain a firm grip on the power tool and position your body and
arm to allow you to resist kickback forces.
Always use auxiliary
handle, if provided, for maximum control over kickback or torque reaction
during start-up. The operator can control torque reactions or kickback
forces, if proper precautions are taken.
b)
Never place your hand near the rotating accessory.
Accessory may
kickback over your hand.
c)
Do not position your body in the area where power tool will move if
kickback occurs.
Kickback will propel the tool in direction opposite to
the wheel’s movement at the point of snagging.
d)
Use special care when working corners, sharp edges etc.
Avoid
bouncing and snagging the accessory. Corners, sharp edges or
bouncing have a tendency to snag the rotating accessory and cause loss
of control or kickback.
e)
Do not attach a saw chain woodcarving blade or toothed saw blade.
Such blades create frequent kickback and loss of control.
Safety Warnings Specific for Sanding Operations:
1.
Do not use excessively oversized sanding disc paper.
Follow
manufacturer’s recommendations when selecting sanding paper. Larger
sanding paper extending beyond the sanding pad presents a laceration
hazard and may cause snagging, tearing of the disc or kickback.
WARNING:
Some dust created by power sanding, sawing, grinding, drilling,
and other construction activities contains chemicals known to the State of
California to cause cancer, birth defects or other reproductive harm. Some
examples of these chemicals are:
•
lead from lead-based paint.
•
crystalline silica from bricks and cement and other masonry products.
•
arsenic and chromium from chemically-treated lumber (CCA).
