MIL-L-23251E
L a t h e c e n t e r s a n d c e n t e r s l e e v e . O n e headstock center and one
3.8.1
t a i l s t o c k c e n t e r s h a l l b e f u r n i s h e d . O n e headstock center sleeve shall be
p r o v i d e d for adapting the taper in the spindle nose to the taper of the center
s u p p l i e d . The centers shall be hardened to Rockwell C-62 to C-66. The centers
a n d the sleeve shall be ground to within 0.0003 inch total indicator reading for
c o n c e n t r i c i t y when inserted in the headstock and checked for concentricity.
3 . 8 . 2 Chuck and chuck jaws. The size and type of the chuck and the number of
c h u c k j a w s s h a l l b e a s s p e c i f i e d , ( s e e 6 . 2 ) . T h e chuck shall be a wrench
operated, manual chuck, constructed of steel and shall mount on the spindle nose
without the need for an adapter. T h e top jaws shall be the reversible, stepped
t y p e for internal and external gripping and shall be hardened. A self-ejecting
I n all other aspects the chuck
c h u c k key shall be provided for each chuck.
shall conform to the requirements of ANSI B5.8 for Class I, Medium Duty, Wrench
Operated, Chucks.
3 . 8 . 3 T h r e a d - c h a s i n g d i a l . A thread-chasing dial shall be furnished to allow
d i s e n g a g i n g o f t h e h a l f - n u t a n d r e - e n g a g i n g d u r i n g t h r e a d i n g . The thread
chasing dial shall be mounted on the carriage apron and be driven by the
leadscrew.
3 . 8 . 4 P a s t i v e t h r e a d s t o p . A positive t h r e a d stop shall be fitted to the
c r o s s l i d e to permit quick withdrawal and repositioning of the tool after each
pass when thread chasing.
s p e c i a l wrenches o r t o o l s t h a t a r e r e q u i r e d f o r
3.8.5 Wrenches. All
o p e r a t i o n o r maintenance of the lathe and are normally furnished with the lathe
s h a l l be provided.
3.8.6 Tool post. The tool post shall be either a round single screw type
w i t h a rocker base, a square indexing turret type for holding at least four tool
holders,
o r a quick change tool post capable of holding a tool holder in two
p o s i t i o n s perpendicular to each other on adjacent sides as specified, (see 6.2).
3 . 8 . 7 M i c r o m e t e r carriage stop.
A carriage stop shall mount on the front bed
way
and shall have a precision threaded micrometer screw graduated in
thousandths of an inch for one inch movement.
3 . 9 O p t i o n a l equipment.
O p t i o n a l equipment shall be furnished as specified
and fully described (see 6.2). The optional equipment provided shall be
f u n c t i o n a l without requiring modification of the equipment or machine.
3.10 Repair parts.
Required repair parts shall be furnished as specified
( s e e 6.2).
All words
3.11
Marking on instruments, control panels, charts, and plates.
o n i n s t r u m e n t s , c o n t r o l panels,
charts,
a n d plates shall be in the English
language.
C h a r a c t e r s shall be permanently marked In boldface on a contrasting
background. A l l plates shall be corrosion resistant.
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