MIL-L-23249D
surfaces. Means shall be provided to lock the carriage to the bed at any
desired location between the headstock and tailstock for cross feed type
The carriage shall operate in both longitudinal directions
operations.
under power, regardless of the direction of spindle rotation. The carriage
wings shall have means to prevent chips and abrasive materials from entering
between carriage slide and bed ways. Provision shall be made for use of
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
carriage which shall house the geared feed mechanism that provides the
powered longitudinal, cross, and thread chasing feeds. The apron shall be
of double wall construction, providing bearing support at both ends of gear
shafts. The apron shall support the handwheel that provides manual
longitudinal feeds. The lathe shall have a separate feed rod and lead
screw. A safety interlock shall prevent engaging the feed control and
threading control simultaneously. A clutch or similar device shall protect
the feed mechanism against damage from overload. A thread dial indicator
shall be mounted on the apron to indicate the position to engage the
half-nut with the lead screw when cutting threads. Automatic lubrication
shall be provided for all moving parts within the apron. Automatic or
manually operated one shot pressure lubrication shall be provided for way
surfaces.
3.4.9.1 Apron controlled leadscrew reverse. When specified (see 6.2.1),
the lathe shall have an apron controlled leadscrew reversing mechanism to
permit reversing the direction of the carriage without disengaging the
leadscrew half-nut. When specified (see 6.2.1), feed stops shall
automatically disengage carriage feeds when turning or threading in either
longitudinal direction of travel.
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 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
standard size 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
supporting a work part close to the compound rest without interference with
operation of the top slide. The tailstock shall be easily moved along the
bedways and have a quick acting clamp for locking in position. The spindle
shall hold and eject tang type tools, and shall be graduated in increments
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