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Page Title:
Dimensional control of molded or plastic parts. |
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|  MIL-F-63281A (AR)
4.5.24 Correlation factor. A correlation factor, which
correlated the fuze arming time method (swing fixture) to the
in-line S&A arming time method, shall be run for this fuze.
Correlation tests shall be performed by the contractor with DCAS
verification. Correlation factors shall be validated at six month
intervals (maximum) and re-established whenever:
a.
A new contract is issued.
b.
A change of fuze type.
c.
Fuze timing equipment is modified.
For the correlation procedure, a digital counter or an approved
equivalent device shall be used, set to read milliseconds for S&A
timing and set for oscillograph traces, to the nearest millisecond,
for the fuze. The correlation shall be accomplished as follows:
a. Select five (5) S&A's demonstrating acceptable arming time.
Each S&A shall have repeatable arming times within 25 milliseconds
in five successive runs on the approved S&A timing equipment. S&A
arming times readings shall be obtained from the first movement of
the set-back weight to the detent locking in the rotor.
b. The same S&A's shall be assembled to the electronic modules
and placed in fuze bodies; secured in place with a booster housing,
less "O" ring, and properly torqued. The assemblies shall then be
timed five (5) times on the approved fuze timing equipment.
Readings of the fuze arming time traces, from setback weight
bottoming to rotor detent, shall be recorded.
c. The shift in average fuze time, if any, when compared with
the average S&A time (taken as a standard) shall be used as the
correlation correction and applied to the acceptance test results.
Data obtained in accordance with the above procedure shall be
submitted to address shown in 6.4.
4.5.25 Dimensional control of molded or plastic parts. In
place of normal sampling and ispection associated with the
Classification of Defects, and after a curing time for the parts has
been approved (see Note 1) a sample of five (5) parts as molded from
each cavity shall be fully inspected dimensionally to qualify a new
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