TEMPLATES should be included.
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Care shall be taken to avoid sharp corners or abrupt changes in cross
section and ample fillets shall be used in the construction of patterns.
Draft and increases in pattern thicknesses shall be added as required to
conform to the standard foundry practice applied and as necessary to ensure
that all metal thicknesses of the finished castings conform to the
dimensions shown and are within the tolerances specified in paragraph
INSPECTION OF STEEL CASTINGS. [All patterns [, except those loaned to the
Contractor by the Government,] shall remain the property of the
Contractor.] [Patterns for those parts listed below shall be furnished by
the Contractor, become the property of the Government and not be used for
work under any other contract unless specifically authorized. All other
patterns [, except those loaned to the Contractor by the Government,] shall
remain the property of the Contractor.]
2.2.5.1
[Fabrication of Patterns and Core Boxes
Patterns and core boxes that shall become the property of the Government
shall be substantially made from thoroughly seasoned Grade B or better
sugar pine, northern white pine or an approved equal. Built-up patterns
and core boxes shall be securely glued and screwed together. Glue shall be
of an approved high grade, water resistant and suitably treated for
resistance to fungus and insect infestation. Only light sections are
permitted to be nailed. Screw holes shall be counterbored and neatly
filled with wood plugs. Loose pieces shall be dovetailed or fastened with
pull-out dowels. Split patterns and core boxes shall have metal dowels at
partings. Skelton or sweep patterns will not be accepted unless
specifically authorized. All nail and tool marks on molding surfaces shall
be filled with beeswax. All surfaces shall be sanded with No. 0 grade
sandpaper. Patterns shall be finished with not less than three coats of an
approved phenolic-resin sealer colored in accordance with the standard
trade practices for pattern colors. Each pattern, core box and loose piece
shall be stamped with the part mark shown. Patterns shall be furnished
complete with necessary core boxes and templates.]
2.2.5.2
[Available Patterns
**************************************************************************
NOTE: The serviceability and general condition of
each pattern should be clearly indicated under the
heading of "CONDITION."
**************************************************************************
The patterns listed below are available for loan to the Contractor. They
are stored at [_____] and may be secured f.o.b. their place of storage upon
request.
PART NO.
PATTERN NO.
CONDITION
[_____]
[_____]
[_____]
[_____]
[_____]
[_____]
[_____]
[_____]
[_____]
The Contractor shall assume responsibility for the accuracy and
adaptability of all parts made with the above listed patterns as if the
parts had been made from new patterns produced under this contract and
shall bear the expense of correcting any inaccuracies found in them.]
SECTION 05055A
Page 20
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