MIL-M-80215
3. 2.6 Interchangeability. To provide for replacement of worn parts, all
parts produced by the same manufacturer and bearing the same part number
shall be functionally interchangeable, and shall be dimensionally identical
within the manufacturing tolerance limits in use by their manufacturer.
3.3 Construction. The machine shall be so constructed that when installed
and connected to power, it shall be ready for operation. The machine shall
be constructed of parts which are without defects and free of repair. The
structure shall be capable of withstanding all forces encountered during
operation of the machine to its maximum rating and capacity without perma-
nent distortion.
3.3.1 Castings and forgings. All castings and forgings shall be free of
defects, scale and mismatching. Processes such as welding, peening, plug-
ging, or filling with solder or metallic paste shall not be used for reclaim-
ing any defective part for use in the machine.
3.3.2 Welding. brazing or sold ering. Welding, brazing or soldering shall
be employed only where specified in the original design. None of these op-
erations shall be employed as a repair measure for any defective part.
3.3.3 Fastening devices. All screws, pins, bolts, and similar parts shall
be installed in such a manner as to prevent change of tightness. Those
subject to removal or adjustment shall not be swaged, peened, staked, or
otherwise permanently deformed.
3.3.4 Surfaces. All surfaces of castings, forgings, molded parts, stamp-
ings, and welded parts shall be cleaned and free from sand, dirt, fins,
sprues, flash, scale, flux and other harmful or extraneous materials. All
edges shall be either rounded or beveled unless sharpness is required to
perform a necessary function. Except as otherwise specified herein, the
condition and finish of all surfaces shall be commensurate with the manu-
facturer's standard commercial practice.
3.3.5 Painting. Unless otherwise specified (see 6.2), the machine shall be
painted in accordance with the manufacturer's standard commercial practice.
3.3.6 Threads. All threaded parts shall be in the inch system and shall
conform to Handbook H28.
3.3.7 Dials. All dials shall have a positive retention system to assure
retention of the dial at the desired setting. All graduations, numerals
and letters shall be permanently and legibly displayed and shall have a non-
glare finish. Each dial graduation shall represent not more than 0.001
inch of movement.
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