TO 1-1-700 - Robins Air Force Base

TO 1-1-700
5.22.4 Shock Mounts. The shock mount method is used to
cushion very fragile items and sensitive instruments or mechanisms
that can be damaged by shock and vibration, and the
weight and size of the item may vary from light and small to
heavy and large (see Figure 5-8). The shock mounts may consist
of metal springs with damping, shear mounts, or corner
blocks. This method may be accomplished in any one of four
main ways:
• The item may be suspended directly by the means of
shock mounts.
• The item may be blocked in a cradle and the cradle
suspended by means of shock mounts.
• The item may be boxed in a unit container and the unit
container suspended by means of shock mounts.
• The item may be boxed in an intermediate container
and the intermediate container suspended by means of
shock mounts.
5.23 CUSHIONING VS. DUNNAGE.
There is a profound difference between cushioning material
and dunnage. Cushioning is an engineering application of a
specific material thickness and bearing areas to protect against
known forces whereas dunnage is the application of a unspecific
material for minor protection.
Figure 5-6. Floated Item
5.23.1 Dunnage. Dunnage is the application of unspecific
material to fill voids, to protect the finish from scratches or
abrasions, or to prevent load shifting during transport. Dunnage
may be loose-fill material. According to MIL-STD-2073-
1 loose fill materials are prohibited in all military packages.
Materials such as polyethylene, polyurethane, and polypropylene
foams, flexible cellular plastic films (bubble wrap) and
thin-sheet cellulose material are all acceptable for filling
voids.
5.23.2 Cushioning. Cushioning materials can be used as
dunnage but due to the cost, it is best to only use the cheaper
dunnage materials for filling voids. Unless there is an excess
or scrap cushioning materials available that can not be otherwise
used, don't use them as dunnage.
Figure 5-7. Floated Pack
5-8