4
Safety Recommendations
• Tasks should be performed in such a manner that the
wrists are maintained in a neutral position, which is
not flexed, hyperextended, or turned side to side
• Stressful postures should be avoided — select a tool
appropriate for the job and work location
• Avoid highly repetitive movements of hands and
wrists, and continuous vibration exposure (after each
period of operation, exercise to increase blood circu-
lation)
• Use quality abrasive wheels
• Keep tool well maintained and replace worn parts
Work gloves with vibration reducing liners and wrist supports are
available from some manufacturers of industrial work gloves.
Tool wraps and grips are also available from a number of
different manufacturers. These gloves, wraps, and wrist sup-
ports are designed to reduce and moderate the effects of
extended vibration exposure and repetitive wrist trauma. Since
they vary widely in design, material, thickness, vibration reduc-
tion, and wrist support qualities, it is recommended that the
glove, tool wrap, or wrist support manufacturer be consulted for
items designed for your specific application. WARNING! Proper
fit of gloves is important. Improperly fitted gloves may
restrict blood flow to the fingers and can substantially
reduce grip strength.
USE QUALITY ABRASIVE WHEELS
The primary source of vibration when using a portable grinder is
an abrasive wheel that is out of balance, out of round, untrue, or
possibly any combination of all three.
The use of quality abrasive wheels which are well balanced,
round, and true is highly recommended as they have been found
to significantly reduce vibration. Some abrasive wheels lose
their balance, roundness, and trueness as they wear from use.
Because of the abusive nature of the vibration caused by out of
balance, out of round, and untrue condition of some abrasive
wheels, it is felt that these wheels are more susceptible to failure.
Excessive vibration may signal eminent wheel failure. Flat
spotting of the abrasive wheel, caused by grinding the wheel to
a stop after the power has been shut off can result in changes to
the balance and shape of the wheel. Be sure the grinding wheel
has stopped before setting the tool down. Set the tool in a tool
rest or tool holder when not in use.
Some individuals may be susceptible to disorders of the hands
and arms when performing tasks consisting of highly repetitive
motions and/or exposure to extended vibration. Cumulative
trauma disorders such as carpal tunnel syndrome and tendoni-
tis may be caused or aggravated by repetitious, forceful exer-
tions of the hands and arms. Vibration may contribute to a
condition called Raynaud's Syndrome. These disorders de-
velop gradually over periods of weeks, months, and years. It is
presently unknown to what extent exposure to vibrations or
repetitive motions may contribute to the disorders. Hereditary
factors, vasculatory or circulatory problems, exposure to cold
and dampness, diet, smoking and work practices are thought
to contribute to the conditions. Any tool operator should be aware
of the following warning signs and symptoms so that a problem
can be addressed before it becomes a debilitating injury. Any
user suffering prolonged symptoms of tingling, numbness,
blanching of fingers, clumsiness or weakened grip, nocturnal
pain in the hand, or any other disorder of the shoulders, arms,
wrists, or fingers is advised to consult a physician. If it is
determined that the symptoms are job related or aggravated by
movements and postures dictated by the job design, it may be
necessary for the employer to take steps to prevent further
occurrences. These steps might include, but are not limited to,
repositioning the workpiece or redesigning the workstation,
reassigning workers to other jobs, rotating jobs, changing work
pace, and/or changing the type of tool used so as to minimize
stress on the operator. Some tasks may require more than one
type of tool to obtain the optimum operator/tool/task relation-
ship.
The following suggestions will help reduce or moderate the
effects of repetitive work motions and/or extended vibration
exposure:
• Use a minimum hand grip force consistent with proper
control and safe operation
• Keep body and hands warm and dry (cold weather is
reported to be a major factor contributing to Raynaud's
Syndrome)
• Avoid anything that inhibits blood circulation
—Smoking Tobacco (another contributing
factor)
—Cold Temperatures
—Certain Drugs
WARNING
!
Repetitive work motions and/or vibration
can cause injury to hands and arms.
Use minimum hand grip force.
Keep body and hands warm and dry.
Avoid anything that inhibits blood curculation.
Avoid continuous vibration exposure.
Keep wrists straight.
Avoid repeated bending of wrists and hands.
Extension
Neutral
Flexion
Radial Deviation
Neutral
Ulnar Deviation
Avoid
Avoid
Avoid
OK
Avoid
OK
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