TM 1-1500-204-23-11
Figure 6-6. Removal of Core With Core Knife
(3) If only one skin has been damaged, use the
adhesive to produce a smooth inish.
core slicer to separate the core. Then, com-
Remove by sanding with a 90 degree
pletely remove separated core in the dam-
router motor and an 80 to 100 grit abra-
age cleanup hole area down to the opposite
sive disk. Use care during sanding not
skin inner surface.
to damage adjacent core areas or sand
into the opposite side skin. It is accept-
able to allow some adhesive to remain
(4) Low density core can easily be removed
on the inner skin surface to avoid sand-
by causing cell wall failure using needle
ing into the laminate.
nose pliers and a gentle pulling and twisting
motion. Be careful not to delaminate the
opposite side skin during removal. Use a 90
(b) An alternative method is to use a router
degree router motor and an 80 to 100 grit
with a diamond-coated or carbide bit.
abrasive disk to remove the core and adhe-
When this method is used, a depth
sive from the inner surface of the opposite
controlling ixture or template must be
skin. It is acceptable to allow some adhe-
used to control the depth of the material
sive to remain on the inner skin surface to
removal. Template design must take
avoid sanding into the laminate. If dificulty
into account the cell orientation in order
in removing the core is encountered, employ
to maintain a cut perpendicular to the
the procedures in step (b) below.
core cell axis. See igure 6-7 to view
template orientation and igure 6-8 for
typical router setup with the template.
(a) High density core is sometimes difi-
cult to remove. Remove only enough