MIL-G-80267
Style A machines shall be two
as described in 3.3.14 through 3.3.14.36.
axes programmable machines with linear interpolation and manual data input
(MDI).
Style B machines shall be either three, four or five axes program-
mable machines with full linear and circular interpolation.
Parabolic
Style B
interpolation shall be available when specified (see 3.3.14.2).
machines shall have either tape, cassette, diskette or manual data input
The control unit shall conform to EIA Standard RS-281. A
capabilities.
line voltage of +10 percent from normal shall not adversely affect the
The control shall function in ambient tempera-
numerical control function.
tures ranging from 50° to 120°F and relative humidities ranging from 5 per-
cent to 95 percent non-condensing.
The control shall automatically shut
down when internal operating temperature exceeds safe operating temperature.
Control resolution shall be 0.0001 inch for each linear axis and not more
than 0.001 of a degree for each rotary axis.
The axes shall be identified
in accordance with EIA Standard RS-267. The control shall initiate an error
or halt signal should a fault condition occur in the control.
3.3.14.1
Manual -data -input -(MDI) .
Style A machines shall be two axes
The machine con-
programmable machines with linear interpolation and MDI.
trol unit (MCU) shall provide automatic control of machine functions,
operating modes, two axis feedrate control of X and Y axes, and other part
program directed functions for jig grinders of the type described herein.
The control shall have linear interpolation and simultaneous control of two
Control features shall include buffer storage, part program storage,
axes.
part program edit capability, and control diagnostics. The MCU shall direct
machine functions from part program data stored in memory or manually input
through a keyboard.
3.3.14.2 Computer numerical control (CNC) with MDI capabilities. Style B
machines shall be completely programmable through a microprocessor-type com-
puterized numerical control (CNC). The MCU shall provide automatic control
of machine functions, operating modes, and two axes (X and Y) positioning
and feedrate control. A third axis shall provide positioning control of the
planetary movement of the grinding wheel (C axis). An options?. fourth axis
shall be available for a rotary table (A/D axis). The axes to be numerical
When specified (see
ly controlled shall be as specified (see 6.2.1).
6.2.1), a fifth axis shall be available for either radial infeed (U axis) or
axial feed (Z axis) of the grinding wheel. The MCU shall also provide auto-
matic control of rapid traverse rates, axis dwell. times, and shall initiate
action should a machine fault occur.
The control shall have linear and
Parabolic interpolation shall be provided when
circular interpolation.
specified (see 6.2.1). The control shall be capable of three, four or five
axes simultaneous control, as applicable.
Control features shall include a
programmable interface between the MCU and grinder, buffer storage, fixed
cycles, part program storage, part program and buffer edit capability, and
control diagnostics. The MCU shall direct machine functions from part pro-
gram data stored in memory, through manual data input (MDI), or from data
directly input from the input media specified in 3.3.14.3.
All necessary
executive diagnostic and interface program routines shall be furnished in
the form of one inch, eight channel binary coded decimal punched tape or
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