BE SURE YOU ARE NOT DAYDREAMING
when you use the rotary scaler.
Needle scalers accomplish their task with an
assembly of individual needles impacting on a surface
hundreds of times a minute. The advantage of using
individual needles is that irregular surfaces can be
cleaned readily. See figure 1-66.
PORTABLE PNEUMATIC IMPACT WRENCH
The portable pneumatic impact wrench (fig. 1-67)
is designed for installing or removing nuts and bolts.
The wrench comes in different sizes and is classified by
the size of the square anvil on the drive end. The anvil is
equipped with a socket lock, which provides positive
locking of the socket wrenches or attachments.
Nearly all pneumatic wrenches operate most
efficiently on an air pressure range of 80 to 100 psi.
Lower pressure causes a decrease in the driving speeds,
while higher pressure causes the wrench to overspeed
with subsequent abnormal wear of the motor impact
mechanisms.
Before operating the pneumatic impact wrench,
make sure the socket or other attachment you are using
is properly secured to the anvil. It is always a good idea
to operate the wrench free of load in both forward and
reverse directions to see that it operates properly. Check
the installation of the air hose to make sure it is in
accordance with the manufacturer's recommendation.
SAFETY PRECAUTIONS FOR USE WITH
PNEUMATIC TOOLS—GENERAL
When using pneumatic tools, you should use the
following procedures:
You should wear and use necessary personnel
protective devices. Pneumatic tools shall not be
connected to, or driven by, air pressure in excess
of that for which the tools are designed. The
wearing of appropriate eye protection equip-
ment is mandatory for Navy personnel when
operating pneumatic tools.
You should be authorized and trained to operate
pneumatic tools.
Pneumatic tools should be laid down in such a
manner that no harm can be done if the switch is
accidentally tripped. No idle tools should be left
in a standing position.
Pneumatic tools should be kept in good
operating condition. They should be thoroughly
inspected at regular intervals with particular
attention given to the ON-OFF control valve
trigger guard (if installed), hose connections,
guide clips on hammers, and the chucks of
reamers and drills.
Pneumatic tools and air lines may be fitted with
quick-disconnect
fittings.
These
should
incorporate an automatic excess-flow shutoff
valve. This valve automatically shuts off the air
1-41
Figure 1-66.—Needle impact scaler.
ABDf0171
Figure 1-67.—Pneumatic impact wrench.
