MIL-G-23823E
adjustments and shall be calibrated in such a manner that the last dial
graduation progresses into and is continuous with the first dial graduation as
the dial is rotated through the zero position.
3.2.1.2 Digital readout system. Unless otherwise specified (see 6.2), a
digital 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, and electrical
equipment necessary to ensure complete operation-of the system. The system
shall provide a readily visible digital display over the full working range
of each axis on which installed. The system resolution shall be 0.00005 inch.
The system accuracy shall be 0.0001 inch. The repeatability shall be 0.00005
inch,
measured over the full travel on each axis. Special requirements for
the system components shall be as specified (see 6.2). The display shall
indicate axis location in both the inch-pound and metric units. An input
source fluctuation of
10 percent shall not adversely affect the 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 each axis having a readout system. The feedback device shall be of the
independent type with a resolution equal to the resolution of the digital
readout system. Each feedback device shall be installed with a cover or guard
to prevent physical damage to any portion of the feedback device. The
connecting cable from the position feedback device shall be electronically
shielded to protect against electronic interference and shall be armored to
protect against contamination and damage. The device shall provide axis
travel feedback over the entire range of axis travel for each specified axis.
Installation 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 overdrive. The feedback
unit and related components shall be protected from contamination. Position
feedback 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 readout shall contain a universal digital display with individual
illuminated digits of not less than 0.43 inch in height. Digits shall be high
efficiency displays for high light ambient conditions with wide viewing angle
and shall be readable from a distance of not less than 16 feet. The console
shall display at least six digits per axis simultaneously. The display
console shall also provide keypad entry, memory, absolute/incremental count-
ing,
data preset, power failure indicator, inch/metric conversion, and
absolute zero recall. The electronic display console shall be installed 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 connecting cable shall be armored and shall be securely
fastened to the structure of the machine. Location of the installed cables
shall prevent any interference with normal machine operation.
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