MIL-L-23249D
3.3.10 Electromagnetic interference control. When specified (see 6.2.1),
equipment procured under this specification shall comply with the require-
ments of MIL-STD-461,
3.4 Components. Each lathe shall consist essentially of a bed and base,
headstock, headstock spindle, spindle drive, spindle speed change mechanism,
carriage and apron, feed mechanism, cross slide, compound rests carriage
feed and tailstock. In addition, the machine shall have all other equipment
specifically described herein and all additional equipment necessary for the
machine to meet all of the performance requirements stated herein.
3.4.1 Bed and base. The lathe shall have a bed and base structure that
supports the headstock, tailstock, carriage, and other related equipment.
The-structure shall have sufficient strength and rigidity to support all the
components in rigid alignment in accordance with table II. The bed shall
have V-ways or flatways or a combination of "V" and flat ways to provide a
sliding surface for the longitudinal movement of the carriage and assure
alignment of the headstock and tailstock. The bed ways for the carriage
longitudinal movement shall be hardened and ground to minimize wear and
maintain accuracy of alignment. The bed ways shall be either cast
integrally with the bed structure or may be replaceable way inserts, or a
combination thereof. Means shall be provided to lubricate the bedways
automatically or by one-shot lubrication. The bed shall have a sufficient
number of covered access openings to facilitate inspection, adjustment and
repair of components located within the structure. Means for leveling the
base of the machine shall be provided.
3.4.2 Chip and coolant pan. The chip and coolant pan shall be
constructed to 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
aligns the spindle axis parallel with the bed ways. The headstock shall
house the gearing for the spindle drive and power take-off source for the
feed mechanism. 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. The headstock shall be an oil tight unit
and shall have means of lubricating all bearings and gears that require
continuous lubrication. The headstock shall include necessary controls for
selecting and changing spindle speeds.
3.4.4 Headstock spindle. The lathe shall have a headstock spindle to
support a chuck, faceplate, or collet which in turn holds and provides rota-
tion of the workpiece. The spindle shall be supported by roller or ball
type bearings that have a size, type and precision class suitable for the
application. Unless otherwise specified (see 6.2.1), the spindle nose shall
be the type "D" as normally provided as specified in table I and shall con-
form to the requirements of ANSI B5.9. The spindle internal taper shall be
as specified in table I and shall conform to the requirements of ANSI B5.1O.
The spindle nose shall be accurately machined to provide locating surfaces
Check the source to verify 7
that this is the current version before use.
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