MIL-M-80269
baffle or a strainer which is easily removable for cleaning. Means shall be
provided to permit the operator to direct and control the amount of
coolant.
3.4.8 Hydraulic system. The hydraulic system shall be complete, includ-
ing all pumps, valves, piping, cylinders, and pressure controls. Over pres-
sure protection shall be provided in the high pressure line to prevent
damage to components. A filter system shall be provided to ensure delivery
The hydraulic reservoir shall have means for determining
of clean fluid.
fluid level, a provision for draining, and a cleanout access plate if the
reservoir is not removable.
Electrical system.
Unless otherwise specified (see 6.2.1), the
3.4.9
Each machine shall draw
electrical system shall conform to ANSI/NFPA 79.
all of its electrical power from a single 230/460-volt, 3-phase, 60-hertz
(Hz) circuit. Each machine shall have a fused safety disconnect switch or
circuit breaker. The machine shall be initially wired for operation on 460
An identified terminal for grounding the machine when it is
volts.
The terminal
installed shall be mounted in or near the disconnect switch.
shall be suitable for connecting the size grounding conductor specified in
ANSI/NFPA 79 for the disconnect fuse rating.
Motors shall have ball or roller
3.4.9.1 Motors and motor accessories.
Motors shall be either
bearings and shall be rated for continuous duty.
alternating-current (AC) 3-phase, 60-Hz, or industrial direct-current (DC)
motors conforming to ANSI/NEMA Standard MG 1 and equipped with solid state
rectifiers, or shall be stepping type motors with not less than 50
Unless otherwise specified (see 6.2.1),
incremental steps per revolution.
each electric motor shall meet the requirements of a dripproof enclosure.
3.4.10 Numerical control. The machining center shall have a full automa-
The
tic solid state softwired, integrated circuit type numerical control.
machine control unit (MCU) shall provide automatic control of machine func-
t ions , operating modes, three linear axes movement, spindle operation, tool
change, and other part program directed functions for machining centers of
Controlled axes shall be identified in accord-
the type specified herein.
The control shall have linear and circular
ance with EIA Standard RS-267.
interpolation and be capable of simultaneous control of three linear axes.
Control features shall include a programmable interface, buffer storage,
fixed cycles, part program storage, part program and buffer edit capability,
The MCU shall direct machine functions from part
and control diagnostics.
program data stored in memory, manually input, or input directly from the
media specified herein.
The control shall initiate a halt or an error
signal should a fault condition occur in the control. All necessary execu-
tive program routines shall be furnished in the form of 1-inch eight-
channel binary coded decimal punched tape or flexible diskette for controls
The control unit shall conform to EIA Standard
having volatile memory.
RS-281.
A line voltage of +10 percent from normal shall not adversely
affect the numerical control system function. The control shall be capable
of functioning in ambient temperatures ranging from 30 to 120" Fahrenheit
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