MIL-STD-1168C
Example 1:
A manufacturing activity uses two different welding processes when the specification or drawing gives a choice between Electric Resistance Welding (ERW) or Gas Metal Arc Welding (GMAW) for assembling the Canister Metal parts for an Artillery Illumination Candle.
Example 2:
A manufacturing activity has two different parallel melt pouring lines for loading high explosive but the product can come together at the Loading, Assembling, and Packing line. Since these operations involve special processes and critical defects (see 4.4.6.3.1.b), different interfixes are used and the product is not allowed to combine.
d. or if the equipment configuration, including software, for the parallel portions of the line are not identical.
Example:
IR Decoy Flares produced on the same line with the chemical bath portion being performed in parallel. All processes are identical with the exception of the chemical bath treatment. On one side the chemical bath is fully automated, on the other side the bath is performed and timed manually.
4.4.6.4 Production line modifications. Production line modifications necessitate changes in the production interfix numbers. If any step in the production process is altered then the interfix number shall change. Applicable modifications include, but are not limited to, changes to manufacturing processes, production methods, equipment, and software. Production line changes also include implementation of corrective or preventive action resulting from failure analyses, implementation of automation, and replacement of automation with manual operations. If a production line consists of significant manual operations, changing of the interfix is recommended in situations with a high or critical personnel turnover. If a manufacturing activity believes the modifications are not significant enough to warrant a change in interfix number, and if it can be shown that the resulting products from before and after the modifications are homogenous, then a request for use of a single interfix may be submitted for approval
(see 6.10.d). The same restrictions from 4.4.6.3.1 apply for the request of a single interfix. Lots of the same item made by different methods of manufacture shall be assigned different interfix numbers to the next higher interfix number with the lot sequence number reverting to "001."
Example 1:
A production line is modified where some operations that were previously done by a human have been automated instead, such as with the addition of a robot. This modification requires a change in interfix number.
Example 2:
A type of automated machining center is used to manufacture a metal component. Changes are made to the software programming, such as to address a problem or
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