TM 10-5410-223-14 /1
5-10. Ring and Plate Assembly (Special In-
plate. Clean the inserts with methyl-ethyl-ketone
structions for Replacing Inserts)
and allow the inserts to dry.
a. Removal of Defective Inserts. Remove ring end
NOTE
plate assemblies, remove damaged or loose inserts as
Do not touch the inserts after they have been
cleaned.
required. Some loose inserts may be removed by
screwing a 5/16 inch (0.7938 cm) capscrew into the
NOTE
opening and pulling the insert out with a pliers; if
The three inserts on the top of the container cannot
this method fails, proceed as follows: Drill a 3/8 inch
be installed in the same operation as the seven inserts
on the end of the container. If both top and bottom
(0.9525 cm) hole about 3 inches (7.62 cm) from the
inserts are to be replaced, install the top inserts first
end of a 1 inch x 1/4 inch x 12 inch (2.54 cm x 0.635
and allow the potting compound to cure for at least 4
cm x 30.48 cm) steel bar. Place the hole of the bar
hours before installing the end inserts.
over the insert and thread a 5/16 x 1 inch (0.7938 x
c. Preparation of Potting Compound. Prepare the
2.54 cm) capscrew through the bar and into the
potting epoxy by mixing equal parts of resin and
insert. The capscrew should be long enough to
curing agent in a clean container. Use long smooth
"bottom" in the insert and leave clearance between
strokes rather than a whipping motion to prevent
the head of the screw and the bar. Turn the capscrew
bubble formation. Pot life at normal ambient
with a pneumatic wrench and pry outward with the
temperature (75 5F.) (24 -15C.) is ap-
metal bar until the insert is pulled out.
proximately 2 hours. Length of time decreases with
b. Preparation. To pot an insert successfully, all
increased temperature. Discard time should be at the
of the old epoxy must be removed from the facings
point where the epoxy is no longer pliable enough to
and honeycomb. The epoxy can be broken up with a
be worked into the cavity.
small chisel and hammer. A rotary file and drill
d. Application of Potting Compound. Fill a teflon
motor will also be effective. Remove loose particles
caulking gun cartridge* with potting compound and
from the hole using clean compressed air, a
pump the compound into the bottom of the hole. Fill
screwdriver or a needle-nose pliers. Scrape all of the
each hole completely, eliminating voids and air
old potting compound off the plate and container.
bubbles. As the epoxy settles, add more. Replace
Attach the inserts to the plate handtight with 5/16
epoxy which has run out of holes onto vertical
inch x 9/16 inch (0.7938 cm x 1.4288 cm) capscrews
surfaces.
using one flatwasher between each insert and the
Nomenclature
Part No.
Manufacturer
Selant gun complete . . ...250-12
H. S. Bancroft Corp.
Cartridge
950-C-12X
H. S. Bancroft Corp.
Nozzle
440
H. S. Bancroft Corp.
Plunger
950-P
H. S. Bancroft Corp.
e. Installing the Inserts. Grasp the ring and plate
f. Testing and Final Assembly. After the potting
assembly with the attached inserts and slowly push
compound has cured for a minimum of 72 hours,
the inserts into their respective holes. Do not touch
remove the ring and plate assemblies and test each
the inserts. If the inserts on the top of the containers
insert by reinstalling the capscrews and applying 200
are in place, fasten the plate to them with 5/16 inch x
pound inches (35720 cm) of torque to each insert. All
9/16 inch (0.7938 cm x 1.4288 cm) capscrews.
inserts which turn at 200 pound inches (35720 cm) or
Remove excess potting compound. Allow to cure 4
less are not properly bonded to the potting com-
hours before disturbing the ring and plate assembly.
pound and must be replaced by repeating steps a.
Inserts on which there is structural dependency
through f. Reinstall the ring and plate assemblies.
should not be disturbed for 72 hours. Epoxy
NOTE
m a n u f a c t u r e r ' s specification sheets list the
Due to irregularities of the container surface or
following cure times to attain maximum strength:
distortion of the plate some capscrews may require
washers to completely fill the space between the plate
77F. (25C. )
72 - 120 hours
and the top of the insert. Distorted ring and plate
150F. (66C. )
3 - 4 hours
assemblies must be discarded and replaced. Prepare
200F. (93C. )
40 - 60 minutes
Sealant PR-1422 by mixing 7.5 parts by weight of
part "A" to one part of part "B". Apply Sealant
underneath the head of each capscrew and to the
outer edge of each ring and plate assembly.
*Source of caulking gun:
5-10
