MIL-L-23400E
under power, regardless of the direction of spindle rotation. The carriage
wings shall have means to prevent chips and abrasive materials from entering
between the carriage slide and bed ways. Provision shall be made for use of
a taper attachment and follow rest . The top of the carriage shall have ways
perpendicular to the axis of the machine to support the cross slide and
compound rest.
3.4.9 Apron. The lathe shall have an apron on the front side of the car-
riage which all contain the feed mechanism, threading mechanism, operating
controls and lubrication system for the apron and carriage components. The
operating controls shall include power longitudinal and cross feeds, auto-
matically operated longitudinal feed stops, threading controls, and a
spindle start and stop. Lever type operating controls such as the threading
and feed engagement shall fully engage and disengage with smooth, positive
The apron shall be double wall construction providing inboard and
action.
Gearing in the apron shall
outboard supports for both ends of gear shafts.
An interlock shall be
provide hand and power longitudinal and cross feeds.
incorporated in the apron to prevent simultaneous engagement of the feed and
Handwheels shall automatically disengage to assure nonrotation
half-nut.
while the carriage is under power.
The feed rod and leadscrew shall be
separate units.
3.4.9.1 Leadscrew reverse mechanism. When specified (see 6.2.1), the
lathe shall have a leadscrew reversing mechanism to permit reversing the
direction of the carriage without disengaging the leadscrew half-nut or
The control for
changing the speed and direction of spindle rotation.
leadscrew reversing shall be conveniently located to the operators normal
work station.
3.4.10 Cross slide. The cross slide shall be fitted to the carriage ways
and shall have means to compensate for wear between the sliding surfaces.
The cross slide shall be positioned by a precision feed screw which shall be
protected from dirt and chips.
3.4.11
Compound rest.
A compound rest shall be mounted on top of the
cross slide. The base of the compound rest shall be graduated in one degree
increments to not less than 90 degrees each side of a zero reference.
The
base shall swivel horizontally through 360 degrees. Means shall be provided
to lock the compound at any angular setting. The compound rest shall have a
T-slot for mounting tool holders.
The compound slide feed screw shall be
protected from dirt and chips.
3.4.12 Tailstock. The tailstock shall be constructed to permit support-
ing a work part close to the compound rest without interference with opera-
The tailstock shall be moved easily along the bed-
tion of the top slide.
ways and have a quick acting clamp for locking in position.
The tailstock
spindle shall hold and eject tang type tools, and shall be graduated in
increments not greater than 1/16 inch for measuring spindle extension. The
tailstock spindle taper shall be in accordance with ANSI B5.10 for self-
The tailstock shall be marked to indicated set-over as
holding tapers.
Tailstock spindle locking shall not affect accuracy
specified in table I.
of alignment.
3.4,13 Coolant system. The coolant system shall include a sump or reser-
voir, a power driven pump, and all necessary piping.
The sump or reservoir
shall have sufficient capacity to permit full flow of coolant.
The system
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