MIL-B-80272
The jig boring machine will be
3.4.10 Computer numerical control (CNC).
equipped with a fully automatic solid state soft-wired, integrated circuit
The numerical control shall provide automatic
type numerical control.
control of machine functions, operating modes, spindle speeds and direction
of rotation and simultaneous control of the machine's three linear axes in
lnear, circular and helical interpolation and the rotary dividing table, if
The control shall have the features and capabilities
ordered (see 3.4.6).
Machine axes shall be identified in accordance with
specified herein.
EIA-RS-267. Line voltage fluctuation of
percent from the normal operat-
Unless
ing voltage shall not adversely affect the operation of the CNC.
otherwise specified (see 6.2.1), the control shall be provided for connec-
tion of a 115-volt AC 60 hz, single phase power source.
The control shall
be capable of operating in an outside ambient temperature of 50-110 degrees
F at 5-95 percent noncondensating relative humidity.
The control shall be
automatically shut down when the maximum operating temperature is reached.
Program resolution shall be 0.0001 inch for each linear axis. The mechani-
cal and electrical design of the control shall comply with EIA-RS-281 con-
struction standards. The control shall be capable of accepting and process-
ing input data in the form and format specified by the ordering activity.
When EIA-RS-494 input data is specified, EIA Standards RS-227, RS-244,
RS-274, and RS-358 do not apply to the numerical control.
Punched tape data input.
3.4.10.1
Unless otherwise specified (see
6.2.1), the input media for the control shall be 1-inch, eight-channel
punched tape complying with EIA-RS-227.
3.4.10.1.1
Tape reader.
The control shall be equipped with a photo-
electric tape reader capable of holding, feeding and reading tape prepared
in the format specified at a rate not less than 150 characters per second.
Unless otherwise specified (see 6.2.1), the tape reader shall be supplied
with standard feed and take-up spools 5-1/4 inch in diameter.
The tape
reader shall be housed in a dustproof enclosure mounted in the control
cabinet and shall be easily accessible for cleaning and tape handling. The
control shall have a tape error detection capability to continuously check
for the following errors:
a. Odd parity per EIA RS-244
b. Even parity per EIA RS-358
c. Misaligned sprocket holes
d. No sprocket holes
Any of the above errors shall halt machine functions and illuminate an error
light or a message on the data display screen to indicate a fault condi-
tion.
3.4.10.2 Flexible diskette data input.
When 32 Bit Binary Cutter Loca-
tion (BCL) Exchange Input for numerically controlled machines is specified
(see 6.2.1), the input media shall be an 8- inch flexible diskette recorded
in accordance with 3.4.10.2.1. The input data format shall comply with EIA
Standard RS-494. Manufacturers providing functions or features that are not
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