TM 1-1500-204-23-11
(5) Vacuum Type Sanding Disk, Disk Holder
and Dust Collection Shroud. This system uses a 90
degree router motor, 3 inch disks and disk holders
both with 6 spaced vacuum collection holes. Used
in conjunction with the dust collection shroud, the
inch 80 psi (100 psi maximum) air pressure line,
this unit captures dust at the point of generation. It
has the disadvantage of being unwieldy due to the
attachment of the extra vacuum collection hose to
the dust collection shroud.
(6) Arbors. An arbor in this application is a
shaft on which a revolving cutting tool is mounted.
Arbors are used for mounting, cutting, and grinding
wheels.
g. Hole Saw. Diamond abrasive hole saws, used
between 100 to 500 rpm, are the best choice for
cutting iberglass, boron, and carbon reinforced com-
posites. Traditional hole saws work well on aramid
NOTE
the reverse cutting direction. When using a hole
Grinders (straight and 90) must be used with
saw, the drill motor should be operated as suggested
caution if used for paint removal. The use
in this paragraph. When drill motors are used for
of non-oscillating grinders to remove coatings
damage removal, they are most often used with a
can remove too much material resulting in
diamond-coated hole saw for carbon, iberglass, and
substrate damage. The use of Scotchbrite
boron materials. A toothed hole saw run in reverse
or similar "bufing" disks is necessary to
is appropriate for cutting aramids and polyethylenes.
reduce this possibility. Orbital type sanders
A hole saw can easily remove damage from 1 to 3.5
and hand sanding are the recommended
inches in diameter in a very neat, uniform manner.
methods for paint removal. Always refer to
The material being cut should be well supported and
the applicable technical manual for proper
irmly backed up with wood or an aluminum plate to
equipment selection.
prevent backside breakout. Hole saws may also be
used to cut through core for damage removal, but
only when the damage removal cut is to be made
(3) Abrasive Sleeve and Sanding Drums. The
perpendicular with the skin. When using a hole saw
drum consists of a 1.5 inch diameter by 1 inch long
and access to the backside of the structure exists,
rubber drum and an abrasive sleeve which its over
do not cut the hole all the way through the skin of
the drum. The rubber drum absorbs shock loads
sandwich structure unless a backup material is used.
and reduces vibration during machining. It is used
Failure to use a backup material has a high poten-
freehand with a 0 or 90 degree router motor.
tial for causing additional damage on the backside
of the structure. The backside skin can easily be
(4) Sanding Disks and Disk Holders. The
delaminated and separated from the core. If access
sanding disks and holders have a locking feature that
to the backside skin from the outside is not possible,
allows the disks to be positively locked in place during
extreme care must be taken to minimize any damage
sanding. Disks use aluminum oxide or silicon carbide
to the backside skin. Slowing the feed rate down
abrasive material in various grits. Disks and disk
considerably near the moment of penetration can min-
holders are available in all three tool sets. Sanding
disks are also used for honeycomb core machining.
saw and guide bushing assembly.
They can be used freehand with a 0 or 90 degree
router motor.