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1.3 Kickback and related warnings
Kickback is a sudden reaction to a pinched or snagged grinding accessory. Pinching or snagging
causes rapid stalling of the grinding accessory which in turn causes the uncontrolled grinding
tool to be forced in the direction opposite of the accessory’s rot
ation at the point of the
binding.
For example, if a rotary burr is snagged or pinched by the workpiece, the edge of it that is
entering into the pinch point can dig into the surface of the material causing the rotary burr
to climb out or kick out .The rotary burr may either jump toward or away from the operator,
depending on direction of its movement at the point of pinching.
Kickback is the result of grinding tool misuse and/or incorrect operating procedures or
conditions and can be avoided by taking proper precautions as given below:
1.
Maintain a firm grip on the grinding tool and position your body and arm to allow you
to resist kickback forces.
2.
Always operate the machine using two hands, 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.
3.
When using rotary burrs or other grinding accessories, always have the workpiece
securely clamped. These grinding accessories will grab if they become slightly canted
in the groove, and can kickback. When a rotary burr grabs, it may jump from the groove
and you could lose control of the grinder.
4.
Never place your hand near the grinding accessory. Accessory may kickback over your
hand.