a. Use. Figure 7-21 shows a typical use of a crowfoot
wrench, where a bolt is installed in a location where an
obstruction does not allow the use of a socket or a
wrench. The wrench is attached to an extension, which
is then attached to a socket handle which is in this case
Ensure that the wrench being used is of
the right size. Use of a wrench larger
than the head of the bolt or nut will
result in rounding of the faces.
b. Care. Observe the following practices for the care
and upkeep of crowfoot wrenches:
(1) Clean wrenches after each use.
Figure 7-20. Crowfoot Wrench
(2) Apply a coat of light oil to wrenches to prevent
7-16. Soldering Tools. Soldering is a metal-joining
process in which a lower melting-point metal (called
solder) is heated to the point where it melts and wets the
joint surface and then is allowed to solidify in place.
These types are shown in figure 7-22.
a. Types. The following paragraphs describe
(1) Electrical soldering guns. The electrical
soldering guns operates from a standard 115 volt outlet.
The guns operate in a temperature range of 500 to
600°F (260 to 316°C).
Never use a soldering gun when
Serious damage to diodes, transistors,
and other solid state components can
(2) Cordless soldering gun. The cordless soldering
gun operates off a rechargeable nickel cadmium battery.
The gun has a tip performance up to 50 watts and over
700°F tip temperature.
b. Safety. The following precautions must be
observed when using these tools:
Figure 7-21. Using a Crowfoot Wrench