MIL-DTL-14970D
prepared in accordance with NAVORD Drawing 2426913. Sample
donors shall be selected from each batch in accordance with
Table III, Inspection Level II. These donors shall be
assembled in the test arrangement and fired against the
block by initiation of the detonator with a 50 volts DC
(minimum) 20 amperes (minimum) power supply. To be
acceptable for use in the sensitivity test, the average
depth of dent produced in the block by the donors must be
between 0.063 and 0.069 inch and the standard deviation must
not exceed 0.005 inch. Each block shall be used once and
only once. The measurement of the indentation depth shall
be made in accordance with 4.6.7.5.
4.6.7.2 Preparation of acceptor specimens and
measurement of density. The Explosive Composition A-5 shall
be loaded in eight equal weight increments and each
consolidated at 16,000 + 1,000 psi. The first trial loading
shall be with increment weights of 0.16 g of the explosive.
The acceptor body (NAVORD Drawing 2426914) shall be weighed
before and after loading. If all eight increments fit in
the acceptor body with room to spare, adjust the subsequent
acceptor by measuring the remaining unloaded column height
and increasing equally the weight of each increment to meet
the tolerance shown in NAVORD Drawing 2426914. If all eight
increments do not fit into the acceptor body, adjust equally
the individual increment weights based on the actual weight
of explosive contained in the body such that the tolerances
shown in NAVORD Drawing 2426914 are obtained. Load another
test body to assure that the drawing tolerance has been met.
When the adjustment is satisfactory, load the acceptor
bodies to form a total of exactly 20 acceptors meeting the
tolerance shown in NAVORD Drawing 2426914. The acceptors
shall be weighed before and after loading and the density of
each individual acceptor shall be determined and reported to
three decimal places. The individual densities shall be
between 1.645 g/cc and 1.730 g/cc and the average density
shall not exceed 1.723 g/cc.
4.6.7.3 Sensitivity test assemblies. Twenty explosive
properties assemblies shall be prepared in accordance with
NAVORD Drawing 2426912 from a random selection of the
acceptable donors prepared in accordance with paragraph
4.6.7.1 and the acceptors prepared in accordance with
paragraph 4.6.7.2. The concentricity of the acceptor to the
dent block shall be within 0.250 inch. The longitudinal
axis of the donor, acceptor and barrier shall be made
concentric by taping with two wraps of masking tape around
the periphery of these pieces to form a single unit.
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