MIL-M-80269
All parts shall be manufactured to definite
3.2.10 Interchangeability.
dimensions and tolerances that will permit installation of replacement parts
without modification of the part or machine.
3.3 Construction.
The machining center shall be constructed of parts
which are new, without defects, and free of repairs. The structure shall be
capable of withstanding all forces encountered during operation of the
machine at its maximum rating and capacity without distortion.
Castings and forgings.
3.3.1
All castings and forgings shall be free
No processes such as welding,
from defects such as scale and mismatching.
peening, plugging, or filling with solders or pastes shall not be used on
castings or forgings to reclaim any defective components for use on the
Such processes may be used only for enhancing surface finish and
machine.
appearance.
3.3.2
Welding, brazing, or soldering.
Welding, brazing, or soldering
shall be employed only where specified in the original design.
None of
these processes shall be employed as a repair measure for any defective
part.
3.3.3 Fastening devices.
All screws, pins, bolts, and other fasteners
shall be installed in a manner to prevent loosening.
Fastening devices
subject to removal or adjustment shall not be swaged, peened, staked, or
otherwise permanently installed.
3.3.4
Surfaces.
All surfaces shall be clean and free of 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
Except as otherwise specified herein, the
perform a necessary function.
condition and finish of all surfaces shall be in accordance with the manu-
facturer's commercial practice.
3.3.5
Unless
Painting.
otherwise specified (see 6.2.1), the machining
center shall be painted in
accordance with the manufacturer's commercial
practice, provided that all
surfaces to be painted shall be cleaned of all
foreign matter and at least
one coat of primer and one coat of finish color
is applied.
3.3.6 Threads. All threaded parts used on the machining center and its
related attachments and accessories shall conform to FED-STD-H28.
3.3.7 Gears. All gears and pinions spindle and axis drive train shall be
designed and manufactured of a suitable ferrous material to meet or exceed
the requirements of AGMA 360.02 and 390.03 for the English (US) system or
ISO 54 for the metric (SI) system.
The gears shall be of proper width and
size to transmit full-rated torque and horsepower throughout the speed
ranges without failure for the expected service life of the machine.
Gears
in the drive train shall be hardened and ground steel.
Hardness shall be
not less than Rockwell C-45.
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