MIL-DTL-2845E (SH)
TABLE IV. Sizes of members in skid assemblies for shipment
of propulsion shafting greater than 3 inches in diameter.
of:
Size of members for shafts with diameters
16 to 24
8 inches to
Greater than 3
Greater than 24
Item
inches
Inches
less than 16
inches but less
(inches)
inches
than 8 inches
(inches)
(inches)
(inches)
4 by 6 (flat) or 4 by 8 (flat)
6 by 8
4 by 4 or two
Skids
2 by 3's (flat)
two 2 by 6's
(flat)
End headers
4 by 4
4 by 6 (flat)
4 by 8 (flat)
4 by 8 (flat)
Cross skids3/
3 by 4 (flat)
4 by 4
4 by 4
4 by 4
Two 4 by 12's to
Two 4 by 16's
Cradles1/
Two 4 by 6's
Two 4 by 8's to
4 by 16 laminate
and larger
(cutout)
to 4 by 8
4 by 12
with 3/4-inch
laminate with
plywood
3/4-inch plywood
Cradle2/ spacing
20
36
2-1/2 times
2 times diameter
(maximum)
diameter
Lagging
1 by 2
2 by 2
2 by 2
2 by 2
1/
Cradles shall be fabricated in two equal parts, the bottom and top
halves cut to fit the shaft snugly with allowance for preservation, wrapping,
lagging, or other protection. Laminated cradles shall be used for shafts
exceeding 16 inches in diameter.
2/
The number and location of cradles shall be adjusted so that they are
located at the quarter points for sling lifting. The maximum spacing between
cradles is limited to 4 feet.
3/
Cross skids shall be located at each cradle and shall be bolted to
the skids with the same bolts used to fasten the cradle.
3.15.7 Shaft accessories. Shaft accessories such as keys and propeller
nuts shall be cleaned and preserved as specified for shafting in 3.15.2. Shaft
accessories shall be individually wrapped with a barrier material in
accordance with MIL-B-121, type 1, grade A, class 2. Accessories shall be
packed in a single wood or metal box braced to prevent movement during
transportation. Wood materials utilized for container construction shall be as
specified in 3.8.2.2 for multiple trip use. The accessory box shall be
permanently attached to the shaft skid base. The use of dunnage as a filler
material is prohibited. The box shall be assembled with corrosion resistant
(stainless steel) screws. The top cover of the box shall be attached with hex
head corrosion resistant (stainless steel) screws to permit ready removal and
installation of accessories.
3.15.8 Technical reports. When the item specification requires the
technical report be included with the shipment, technical reports shall be
enclosed in a minimum 0.004-inch thick transparent, waterproof, greaseproof
resealable bag (zip-lock or equivalent) to permit removal and replacement of
the technical report. The bag shall be prominently marked "Technical Report".
The technical report shall be placed in a wood box of suitable size for the
report. The wood box shall be permanently affixed to the shaft skid type
base. Wood materials utilized for the technical report box shall be as
specified in 3.8.2.2 for multiple trip use. The top of the technical report
box shall be attached with corrosion resistant hex-head screws to permit
removal and replacement of the report.
3.15.9 Shaft marking. Shaft markings shall be stenciled on the outer
layer of packing or container. Marking shall be 1 inch in height. Markings
shall be applied in accordance with MIL-STD-129 / MIL-HDBK-129 except that
wood containers shall be stenciled in all capital letters. A contrasting
color oil based paint shall be applied to the wood surface prior to
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