MIL-L-23251E
4 . 7 . 4 . 1 Round t u r n i n g t e s t . A t e s t b a r o f 6 0 , 0 0 0 p s i m i n i m u m t e n s i l e
s t r e n g t h steel shall be held in a chuck and turned for a length of approximately
t w o inches at the rpm and feed rate based on the recommended surface cutting
s p e e d for the material and tool being used. T h e finish cut shall be conducted
in accordance with test number 21 of ANSI B5.16 and shall meet the tolerances as
s t a t e d in table III of this specification under the proper category for the type
t h e surface finish shall be no more than 32
lathe specified. In addition,
microinches,
4 . 7 . 4 . 2 C y l i n d r i c a l t u r n i n g t e s t . A test bar of 60,000 psi minimum tensile
s t r e n g t h steel shall be rough turned to the configuration of the specimen in
test number 22 of ANSI B5.16 for cylindrical turning. A finish cut using
carbide tooling shall be made over the two collars in one pass without
a d j u s t m e n t between collars. T h e turned collars shall be within the accuracy
t o l e r a n c e specified in test number 22 of table III under the proper category for
the type lathe ordered. The test part shall then be prepared for turning
b e t w e e n centers as described in test number 23 of ANSI B5.16. A cut shall be
m a d e over the two collars and the diameters shall be within the tolerance for
turning cylindrical between centers in test number 23 of table II. spindle
speeds and feeds shall be based on the recommended surface cutting speed for the
m a t e r i a l and carbide tooling being used.
A square specimen of 60,000 psi minimum tensile
4.7.4.3 R o u g h i n g t e s t .
s t r e n g t h steel with 3-inch sides, and 16 inches in length shall be rough-turned
b e t w e e n centers by two or more cuts; depth of cut 0.250 inch, and a cutting
speed of approximately 40 RPM, and feed rate of approximately 0.035 inches per
r e v o l u t i o n . The maximum diameter of the bar at the tailstock and the maximum
diameter of the bar measured 10 and 15 inches from the tailstock end of the bar,
s h a l l n o t v a r y b y more than plus or minus 0.001 inch. The kickback of the
c a r r i a g e relative to the bed shall be measured and shall not exceed 0.001 inch
d u r i n g any single cut. T h e deflection of the tailstock spindle shall not exceed
0 . 0 0 2 i n c h , measured 1/8-inch from the nose of the spindle during the roughing
test.
4 . 7 . 4 . 4 A d d i t i o n a l performance tests. P e r f o r m a n c e tests required in addition
to or in lieu of the requirements given shall be as specified and fully
d e s c r i b e d (see 6.2).
4 . 7 . 5 Electromagnetic
interferenc
control
test
Equipment
requiring
electromagnetic
i n t e r f e r e n c e control shall be tested for compliance with 3.3.8
using the procedures given in MIL-STD-462.
4 . 8 Packaging inspection.
Packaging of each item shall be inspected to
determine compliance with the requirements of section 5.
5. PACKAGING
The requirements
for packaging shall be in
5.1 P a c k a g i n g requirements.
a c c o r d a n c e with MIL-M-18058.
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