(3) Accuracy of Punched and Drilled Holes - The accuracy of holes
punched or drilled full size shall be such that for assembled
components with a group of contiguous holes in the same plane 75
percent of the holes shall admit a rod equal to the diameter of
the cold rivet at right angles to the plane of the connection.
The accuracy of holes required to be reamed or drilled after
assembly shall be such that any group of contiguous holes in the
same plane shall show no offset greater than 1 mm 1/32 inch
between adjacent thicknesses of metal. Drifting to enlarge holes
will not be allowed. Poor matching of holes will be cause for
rejection. Reaming to a larger diameter for the next standard
size rivet will be allowed for slight mismatching.
b. Driving Rivets - Components to be riveted shall have all parts well
pinned and firmly drawn together with bolts before riveting is
commenced. Rivets shall be heated uniformly to a light cherry red
color at a temperature not over 1070 degrees C 1950 degrees F in a gas,
oil or electric furnace constructed so that it can be adjusted to the
proper temperature except that an approved coal or coke furnace may be
used for heating field rivets. Rivets shall not be driven after their
temperature falls below 540 degrees C 1000 degrees F. When heated and
ready for driving rivets shall be free from slag, scale and adhesive
materials. Rivets shall be hot driven with pressure tools. Driven
rivets shall completely fill the holes. Rivet heads shall be neatly
formed with dies of approved shape and shall be full size, concentric
with the rivet hole and in full contact with the member. Loose,
burned, badly formed or otherwise defective rivets shall be removed and
replaced with care to avoid damage to adjacent metal. Recupping or
caulking will not be permitted. Countersunk rivet heads shall be
chipped or ground flush with the surface of the plate unless otherwise
specified or authorized. Field rivets shall not be painted until they
have been inspected and accepted.
2.2.4.2
Riveted Aluminum Connections
Punching, drilling, reaming and riveting for riveted aluminum connections
shall conform to the requirements of AA ADM1, Section 6.
2.2.5
Patterns
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NOTE: The first bracketed option in this paragraph
(third sentence) will be generally used since in
most cases it will be to the advantage of the
Government not to retain any patterns, or core boxes
or templates, and save the expense of repairs,
shipment and storage. If the Government has
patterns available for loan to the Contractor,
subparagraph AVAILABLE PATTERNS should be included,
with the appropriate information provided in the
bracketed underlined spaces. If the first bracketed
option is used and the Government has patterns
available for loan to the Contractor, subparagraphs
DISPOSITION OF PATTERNS, CORE BOXES, AND TEMPLATES
should be suitably modified and included. If the
second bracketed option (fourth sentence) is used,
subparagraphs FABRICATION OF PATTERNS AND CORE BOXES
and DISPOSITION OF PATTERNS, CORE BOXES AND
SECTION 05055A
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