MIL-L-23400E
3.4.2 Chip and coolant pan. The chip and coolant pan shall allow coolant
to drain from the chips and-be returned to the coolant system for reuse.
There shall be adequate clearance between the chip pan and the lathe bed to
allow for chip removal.
3.4.3 Headstock. The lathe shall have a headstock that. supports and
It shall contain all
aligns the spindle axis parallel with the bed ways.
the gearing necessary to provide the required speeds; clutch and quick
acting brake mechanism to start and stop the spindle rotation and to allow
free rotation for changing speeds; and a power takeoff to the gearbox for
feeding and threading.
The headstock shall house the gearing for the
Speed
spindle drive and the power take-off source for the feed mechanism.
selections shall be by manually setting levers or dials on the headstock.
Spindle start and stop shall be by levers on the headstock and on the apron
of the lathe. The headstock shall be constructed to support the spindle and
gear shafts so as to prevent deflection that would affect accuracy under
full operating and cutting loads.
All load carrying surfaces of gears,
clutch jaws and surfaces of shafts on which' gears and clutches slide, or
internal surfaces of sliding parts, shall have a surface hardness of not
less than Rockwell C-48.
When power to the spindle drive mechanism is
transmitted through V-belts, means shall be provided to maintain proper belt
The headstock shall be oiltight and shall have automatic lubrica-
tension.
When specified (see
tion to all internal parts that require lubrication.
6.2.1), a temperature sensor shall be provided to monitor the temperature of
the headstock lubricant and shut the machine off at a preset temperature
limit below the flashpoint of the oil vapor.
3.4.4 Headstock spindle. The lathe shall have a headstock spindle to
provide accurate mounting and rotation of a chuck, faceplate, or collet.
The spindle shall be supported by roller or ball type bearings of a size,
Unless otherwise
type and precision class suitable for the application.
specified (see 6.2.1), the spindle nose type shall be type "D", as normally
provided and as specified in table I, and shall conform to the requirements
The spindle internal taper shall be as specified in table I
of ANSI B5.9.
and shall conform to the requirements of ANSI B5.1O. The spindle nose shall
be accurately machined to provide locating surfaces for lathe centers,
faceplates and chucks. The inner and outer surfaces of the spindle nose on
which work holding devices are mounted shall be hardened- to at least
Rockwell C-40.
3.4.5 Spindle drive. The lathe shall have a spindle drive mechanism that
will provide the required range of spindle speeds listed in table I.
The
spindle shall be driven through an all gear or combination gear and belt
All gears shall meet
drive by an electric motor as specified in table I.
the requirements of 3.3.8.
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