MIL-L-23400E
ware, and electrical equipment necessary to assure complete operation of the
The digital readout- system shall be approved by the Underwriters
system.
Laboratory (U.L.). The system shall be capable of providing a readily visi-
ble digital display over the full working range of each axis on which in-
stalled.
The system resolution shall be 0.0001 inch.
The system accuracy
shall be 0.0002 inch per foot and the repeatability shall be 0.0001 inch.
Special requirements for digital readout system components shall be as spe-
cified (see 6.2.1). The readout system shall be capable of indicating axis
location in both the US and SI systems of measurement.
The digital readout
system shall be provided with a means for calibration.
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. Each feedback device shall be installed with a cover or
guard to prevent physical damage to any portion of the feedback device or
contamination by oil, dust, chips, coolants, etc.
The device shall provide
axis travel feedback over the entire range of axis travel for each specified
axis. Provisions shall be made to prevent damage to the feedback device in
the event of overtravel.
3.2.1.2.2 Electronic display console. The electronic display console for
the digital readout system shall contain a universal digital display with
individual illuminated digits not less than 0.560 inch high.
The console
shall be capable of displaying at least six digits simultaneously. The dis-
play console shall also provide keyboard entry, memory, absolute/incremental
counting, data preset, power failure indicator, inch/metric conversion, and
absolute zero recall.
The electronic display console shall be installed so
as to be readily accessible and easily read from the operator's work posi-
The console shall be mounted to withstand shock and vibration
tion.
The connecting cable shall be armored and shall be
generated by the lathe.
installed so as not to interfere with the normal operation of the lathe.
The cable shall be securely fastened to the structure of the lathe in
accordance with the requirements of the contract.
3.2.2
The lathe may contain reclaimed materials
Reclaimed materials.
provided such materials will not jeopardize the machine's intended use, per-
formance or life. The reclaimed materials shall have been reprocessed, re-
manufactured, or recycled in a manner which will restore them to the same
chemical composition and physical properties as the materials originally
selected for use on the lathe.
3.2.3 Energy efficiency.
The lathe and its applicable components that
directly consume energy in normal operation shall be designed and con-
structed for the maximum degree of energy efficiency as governed by the
lastest developmnets available within the industry.
All operating controls shall be located convenient to
3.2.4 Controls.
the operator at his normal work station.
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