tighten the chuck jaws and rear centering jaws. Put the
tool support bar in a position to support the cutter
handle. Next, apply the cutter to the pipe as though you
were cutting it manually. Let the cutter handle rest on
the tool support bar. Ensure the cutter wheel is exactly
on the mark where the pipe is to be cut. Now, tighten
the cutter blade so it contacts the pipe. The next step is
to turn the power switch to the FORWARD position.
Continue turning the cutter blade into the pipe until the
cut is completed.
After the pipe has been cut, it can be reamed with
the same machine. To ream the pipe, place the reamer
in the pipe end. Let the handle of the reamer rest
against the tool support bar. Turn on the motor. Press
the reamer into the pipe as needed to remove the burr.
The machine can also be used for threading pipe.
First, insert the pipe into the front or the rear of the
machine. Let the pipe extend out of the speed chuck far
enough so the threader clears the chuck during
threading. Next, center the pipe in the speed chuck and
close the jaws with a snap spin of the handwheel. If the
pipe extends out the back of the machine, close the rear
centering jaws. Then place the threader on the pipe in
the usual way. Pull out the tool support bar to the
desired position and allow the threader handle to rest
on the tool support bar on the switch side. Hook the
safety latch over the handle. Now turn on the switch
and proceed to thread the pipe. During the threading
operation, remember to use plenty of cutting oil. In
addition to the machine shown in figure 3-60, figures
3-61 and 3-62 show other types of power pipe
machines and their accessories.
JOINING.THREADED PIPE JOINTS are
used on galvanized steel, galvanized wrought-iron,
and black iron pipe. This method of pipe joining
involves connecting threaded male and female ends.
To obtain a tight-threaded joint, be sure the threads
are clean and in good condition. If the pipe has been
exposed to the weather or banged around, check the
threads carefully. When necessary, run a die over the
threads to straighten the damage.
After securing the pipe in a vise, you must clean
both ends with a wire brush. Then apply a good thread
lubricant on the male pipe threads. You should always
use a Navy-approved nontoxic compound for water
pipes or antisiezing tape and mixed powdered graphite
and oil for steam pipes. Do not apply pipe dope inside
the pipe fitting, or you will foul the system.
Start the joint by hand and turn it up as far as you
feel it will go. Now, slowly screw the remaining
section of the pipe into the joint and tighten it with a
pipe wrench. Do not use a hickey, or oversized wrench,
or too much pull. Not all of the male threads should be
screwed into the joint. If all the threads are used, the
Figure 3-61.Power drive with accessories.