MIL-STD-792F(SH)
19 May 2006
design drawings or in the applicable fabrication procedures and shall be submitted to the authorized representative of NAVSEA for approval prior to use.
5.7 Type VII, engrave marking. Engraved characters shall be restricted to the following dimensional limitations: maximum depth - 0.010 inch, minimum depth - 0.004 inch and minimum root radius - 0.005 inch.
5.8 Type VIII, laser engraving. Laser engraved characters shall have a nominal depth of 0.001 to 0.003 inch deep, but a maximum depth of the characters shall be no greater than
0.005 inch.
(a) User activities are advised that variability exists among different laser engraving machines in producing controlled depth and contour of engraved marks.
(b) Each user activity shall have a formal qualification procedure for the laser engraving machine. The qualification procedure shall be approved by NAVSEA or their authorized representative. The qualification procedure must demonstrate that the laser engraving machine will provide a round bottom contour and the required size and depth of engraving for each material to be engraved. The demonstration shall include a minimum of five lines engraved on each material sample. A string of all alpha (a to z) and numeric (0 to 9) characters shall be engraved beneath each line using the character type and size to be used in production. The engraved samples shall be inspected as follows:
A transverse cross-section shall be removed from each sample. The samples shall be examined at 100X and evaluated for conformance to
the depth and contour requirements. Cracks and loose or easily removed recast material are not permitted.
A portion of each demonstration sample shall be tested in accordance with the ANSI 84.0 requirements for the bend testing of a weld. One face bend specimen shall be tested. The bend radius shall be selected to obtain a minimum 20 percent elongation or the minimum required elongation of the base material, whichever is less. The markings in the bend region shall be examined at 100X. Cracks and loose or easily removed recast material are not permitted.
5.8.1 Type IX, dot matrix marking. The depth of the marking shall be nominally 0.001 to
0.002 inch and no deeper than 0.004 inch. Dot matrix marking shall have a 135o included angle nominally and a minimum tip radius of 0.015 inch. For each material to be marked, the
minimum tool force necessary to obtain characters of nominal depth shall be used. The
marking tool tips shall not be cadmium plated. Type IX marking may be used as a substitute for type I marking where vibrating tool marking is allowed. Where type IX is used as a substitute for type I, the tip radius and depth requirements for type I shall apply.
5.9 Limitations on identification marking.
5.9.1 Electric arc marking pencils shall not be used for any marking applications.
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