MIL-M-80269
however, shall supersede applicable laws and regulations unless a specific
exemption has been obtained.
REQUIREMENTS
3.
3.1 Design. The machining center shall be new and one of the manufactur-
Its design shall include features and components
er's current models.
necessary for maintaining alignment and accomplishing drilling, tapping,
The machine shall have a vertical
milling, and boring as required herein.
Z-axis motion shall
axis spindle assembly mounted on the spindle carriage.
The
be provided by vertical movement of the spindle assembly or quill.
spindle carriage shall move along the guideways of the cross rail; this is
Y-axis movement.
On type I machines, the cross rail moves in a vertical
On type 11
direction along guideways of the columns, W-axis movement.
machines, the cross rail is rigidly mounted to the two columns. The columns
shall extend down either side of the worktable and attach to the machine
base. The base shall support a worktable arranged to support and secure the
workpiece in the machining operations. The table shall move longitudinally
Tools, toolholders, and adapters
along ways of the bed for X-axis motion.
shall be inserted and removed from the spindle by a tool changer with
storage magazine. Tool change, spindle operation, and motion in the X, Y,
and Z axes shall be directed by a computer numerical control (CNC) system.
The machine and its numerical control system shall constitute a completely
functional system with built-in operations programmed by coded punch tape
The machine functions shall be controlled by manually
or other devices.
operated control devices, semi-automatically by manual data input devices,
and automatically from tape input and part programs in data memory.
Al 1
parts of the machine or system that are subject to wear, breakage, or
distortion shall be accessible for adjustment, replacement and repair.
3.2
Measurement systems.
Unless otherwise specified, either the U.S.
Customary System of Units CUS) or the International System of Units (SI)
shall be used in the design and construction of the machining center.
When
only one system of measurement is acceptable, the particular system required
be as specified (see 6.2.1).
shall
In this specification, all measure-
These
ments, dimensions, sizes, and capacities are given in US
units.
measurements may be converted to SI units through the use of the conversion
factors and methods specified in FED-STD-376.
3.2.1
Measuring and indicating device calibrations.
Unless otherwise
specified, either the U.S. Customary System of Units (US) or the Interna-
tional System of Units (SI) shall be used to graduate measuring and indicat-
ing devices such as scales, depth stops, carriage stops, dial indicators,
pressure gauges, temperature indicators, and other similar devices,
When
only one system of graduation is acceptable, the particular graduation
required shall be as specified (see 6.2.1),
Regardless of the measurement
system used, all measuring and indicating devices on the machine shall be
graduated in the same system.
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