Figure 4-110. Use of Tap Extractor
Slide the bottom collar down to the
surface of the work so that it will hold the prongs tightly
against the body of the extractor.
Apply a tap wrench to the square shank
Loosen the tap by carefully working the
extractor back and forth.
It may be necessary to remove the
extractor and strike a few sharp blows
with a small hammer and a pin punch to
jar the tap loose. Then reinsert the
extractor and carefully try to back the tap
out of the hole.
Care. Observe the following practices for the
care and upkeep of screw and tap extractors:
Apply a light coat of oil to prevent rust.
Wipe excess oil and metal shavings from
Store in the case provided or wrap
individually to protect the cutting edges.
Double Cutting Shears. Double cutting shears
have a pointed lower blade which works into a slotted
upper jaw and is used for cutting light gauge pipes,
stacks, cylinders, and square ducts of sheet metal.
Most of these shears are equipped with a crimping
attachment on one side for crimping the ends of piping
or ducting when fitting several sections together. A
small strip is sheared away when a cut is made with
these shears. Maintenance for double cutting shears is
the same as that prescribed for snips.
Cutting and nipping metal items may cause pieces of
metal to be thrown. Wear protective eye wear and
4-22. Nippers and Pincers. Nippers are used to cut
protruding metal flush with a surface. They are also
used to cut wire, bolts, nails, and light metal bars to
specified dimensions. Nippers come in a variety of
styles and sizes. Figure 4-111 shows typical tools of this
Use. Nippers and pincers, as previously stated,
are used to cut wire, bolts, rivets, nails, and other similar
items. Figure 4-112 illustrates the technique for cutting
wire, and figure 4-113 shows the procedure for cutting a
rivet or similar object flush with the surface.
Figure 4-111. Nippers and Pincers