MIL-L-23251E
f e e d screws, drive belts,
t o wear or failure such as gears, bearings, shafts,
and seals. Electrical replacement parts shall include, but not be
pumps ,
limited to, motors, relays, fuses, switches, magnetics, pushbuttons, light
braking mechanisms, a n d solid-state devices. T o o l i n g and accessories
bulbs,
n o r m a l l y supplied as standard items shall also be considered replacement parts.
F o r e i g n - s o u r c e d r e p l a c e m e n t parts shall be interchangeable with domestically
supplied components or be readily available from a domestic source.
T h e lathe shall be constructed of parts which are new,
3.3 Construction.
w i t h o u t defects,
a n d free of repairs. T h e structure shall withstand all forces
e n c o u n t e r e d during operation of the machine to its maximum rating and capacity
w i t h o u t permanent distortion or failure.
3 . 3 . 1 C a s t i n g s and f o r g i n g s . A l l
castings and forgings shall be free of
No processes such as welding, peening,
defects,
scale,
a n d mismatching.
plugging,
or filling with solder or
paste shall be used for reclaiming any
d e f e c t i v e p a r t . Such processes may
b e used only for enhancing surface finish
and appearance.
3 . 3 . 2 F a s t e n i n g d e v i c e s . A l l fasteners shall be installed to prevent change
o f t i g h t n e s s . F a s t e n i n g devices subject to removal or adjustment shall not be
p e r m a n e n t l y installed.
3.3.3 Surfaces
All
surfaces
shall
be
clean
and
free
of
harmful
or
e x t r a n e o u s materials. A l l e d g e s s h a l l b e e i t h e r r o u n d e d o r b e v e l e d u n l e s s
sharpness i s r e q u i r e d t o p e r f o r m a n e c e s s a r y f u n c t i o n . E x c e p t a s o t h e r w i s e
the condition and finish of all surfaces shall be in
specified herein,
accordance with the manufacturer's commercial practice.
3.3.4 Welding. b r a z i n g , o r soldering
W e l d i n g , brazing, or soldering shall
b e employed only where s p e c i f i e d i n " t h e o r i g i n a l d e s i g n . N o n e o f t h e s e
operations shall be employed as a repair measure for any defective part.
3 . 3 . 5 P a i n t i n g . U n l e s s otherwise specified (see 6.2),
t h e paint color and
a p p l i c a t i o n s h a l l be in accordance with the manufacturer's commercial practice.
A l l surfaces to be painted shall be cleaned of all foreign matter prior to paint
application.
3 . 3 . 6 Threads.
All threaded parts used on the lathe and its related
a t t a c h m e n t s and accessories shall conform to FED-STD-H28 and the applicable
" D e t a i l e d Standard" section referenced therein.
3 . 3 . 7 G e a r s . A l l g e a r s s h a l l c o n f o r m t o o r e x c e e d all provisions of AGMA
AGMA 2000-A88,
390.03a,
a n d AGMA 2001-B88 for the inch-pound system of
m e a s u r e m e n t or ANSI/ISO 54 for the metric system of measurement. A l l gears
The gears s h a l l be of
s h a l l be manufactured of a suitable ferrous material.
p r o p e r width and size to transmit full-rated torque and horsepower throughout
t h e speed ranges without failure for the expected service life of the machine.
L o a d carrying gears i n t h e d r i v e t r a i n s h a l l b e h a r d e n e d a n d g r o u n d s t e e l .
Working surface hardness shall be not less than Rockwell C-48.
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