MIL-L-23251E
3 . 2 . 1 . 2 D i g i t a l readout system. U n l e s s otherwise specified (see 6.2), a
d i g i t a l readout system shall be installed on the X and Z axes of travel. The
system shall consist of a position feedback device, an electronic display for
each axis,
and all related components,
mounting hardware,
a n d electrical
equipment necessary to ensure complete operation of the system. The system
s h a l l provide a readily visible digital display over the full working range of
e a c h axis on which installed. The X axis and the Z axis resolution shall be
inch. The system
0.0002
0.0010 inch verified upon
a c c u r a c y shall be
installation and calibration of each system on the machine. T h e repeatability
s h a l l be 0.0001 inch, measured over the full travel on each axis. The X axis
shall show twice the amount of cross slide movement to reflect the reduction of
the workpiece diameter. Special requirements for the system components shall be
a s specified (see 6.2). T h e display shall indicate axis location in both t h e
inch-pound and metric units. An input power source fluctuation of
percent
shall not adversely affect the digital readout system operation.
3 . 2 . 1 . 2 . 1 Position feedback device. A position feedback device including all
related components, hardware, and electrical equipment shall be provided for
e a c h axis having a readout system. T h e feedback device shall be of the
independent type with a r e s o l u t i o n equal to the resolution of the digital
readout system. Each feedback device shall be installed with a cover or guard
t o prevent physical damage to any portion o f t h e f e e d b a c k d e v i c e . The
connecting cable from the position f e e d b a c k device shall be electronically
shielded to protect a g a i n s t electronic interference and shall be armored to
protect against contamination and damage. The device shall provide axis travel
f e e d b a c k over the entire range o f a x i s t r a v e l f o r e a c h s p e c i f i e d a x i s .
I n s t a l l a t i o n of the position feedback device shall not limit machine travel on
any axis nor eliminate manual machine stops. Provisions shall be made to
prevent damage to the feedback device in the event of overtravel. The feedback
unit and related components shall be protected from contamination.
Position
f e e d b a c k devices shall be easily and quickly interchangeable between like
machines procured under the same contract.
3 . 2 . 1 . 2 . 2 Electronic display console. The electronic display console for the
digital
r e a d o u t system shall contain a
universal d i g i t a l d i s p l a y w i t h
individual
i l l u m i n a t e d digits of not less than 0.43 inch in height. Digits
s h a l l be high efficiency displays for high light ambient conditions with wide
viewing angle and shall be readable at a distance of not less than 16 feet. The
c o n s o l e shall display at least six digits per axis simultaneously. The display
console shall also provide keypad entry, memory, absolute/incremental counting,
data preset, power failure indicator, inch/metric conversion, and absolute zero
recal 1. The electronic display console shall be installed so as to be readily
accessible and easily read from the operator's normal work station. The console
shall be mounted to withstand shock and vibration generated by the machine. Each
c o n n e c t i n g cable shall be armored and shall be securely fastened to the
s t r u c t u r e of the machine. L o c a t i o n of installed cables shall prevent any
interference with normal machine operation. Electronic display consoles shall
be easily and quickly interchangeable between like machines procured under the
same contract.
3 . 2 . 2 R e c l a i m e d materials.
The machine may contain reclaimed materials to
t h e maximum extent possible provided such materials will not jeopardize the
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