TM 1-1500-204-23-11
Table 3-7.
Visu-Lok II Installation Tooling -- Continued
MRC550 CLOSE QUARTER PNEUMATIC INSTALLATION TOOLING
FASTENER DIAMETER
WRENCH ADAPTER
NOSE ADAPTER
5/32 (-5)
MHC-5
MHCPDN-1
3/16 (-6)
MHC-6
MHCPDN-1
1/4 (-8)
MHC-8
MHCPDN-2
5/16 (-10)
MHC-10
MHCPDN-3
3/8 (-12)
MHC-12
MHCPDN-3
MH75 HAND TOOLING
FASTENER DIAMETER
WRENCH ADAPTER
NOSE ADAPTER
MH-5
5/32 (-5)
MHCPDN-1
MH-6
3/16 (-6)
MHCPDN-1
MH-8
1/4 (-8)
MHCPDN-2
MH-10
5/16 (-10)
MHCPDN-3
MH-12
3/8 (-12)
MHCPDN-3
d Fastener Removal Tools. Fasten-
composite structures because they dull immediately,
ers are removed using specialty hand tooling or com-
generate excessive heat, cause ply delamination, iber
mon hand tools. Common hand tools used to remove
tear out, and unacceptable hole quality. Positive rake
fasteners are a hex Allen wrench, pliers, and drill. See
drill bits induce ply outer delamination around the
paragraph 7-7 for fastener installation and removal
hole. If a twist drill is used, the tip must be ground
instructions.
so the lute rake is parallel to the bit centerline. See
Volume 9 Chapter 4 for drill terminology.
(b) Non-Porous Release Film. Non-porous
(1) Drill Reamer. A straight-luted carbide drill
release ilm, also known as non-porous parting ilm
or separator, goes between the bleeder plies and
reamer (i.e., ST1257B, shown in igure 3-13 and igure
breather plies. It stops resin low from bleeder
3-12 ) has been found to cut high quality holes, with
plies into the breather cloth layers. It is spliced or
minimum backside breakout, in carbon/epoxy and
otherwise overlapped wide enough to prevent bleed
iberglass materials. These last signiicantly longer
through of the resin or adhesive into the breather
than any other bit except for diamond-coated drills and
plies. Non-porous release ilm also prevents excess
countersinks. Drill reamers are expensive; however,
resin from bleeding onto heat blankets and caul plates
they can be sharpened by tool manufacturers. The
when they are used.
sharpening process will render them about 0.001
inches smaller than their original diameter. Before
using sharpened reamers, ensure the smaller diameter
b. Drill Bits. Carbide or diamond-coated drill bits
will be within tolerance for the fasteners you are
shall be used for drilling composite structures. Carbide
installing. Diamond-coated drill bits last the longest
and diamond-coated drill bits minimize backside dam-
and are the preferred drill bit for drilling holes in boron
age to composites. If possible, use a backup plate
reinforced composites.
when drilling. Standard twist drill bits or standard high
speed steel (HSS) drills shall not be used for drilling
Figure 3-12. Typical Drill Reamer
