MIL-L-23251 Lathes, Engine And Toolroom 2516 And 3220 \(S/S By A-A-59334\)This specification covers electric motor driven, engine lathes and toolroom lathes for use in general manufacturing or toolroom type operations with equipment and accessories specified herein. The lathes shall have geared head drive with quick change feeds and either manual shift or variable speed headstock. The requirements set forth in this specification and the completed Ordering Data \(see 3.5 and 6.2\) establish the Government\'s minimum requirements for each procurement.

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MIL-L-23251E

d o e s not authorize submissions of known defective material, either indicated or

actual, nor does it commit the Government to accept defective material.

4.2 C l a s s i f i c a t i o n o f i n s p e c t i o n s .

The

inspection

requirements

specified

herein are classified as follows:

F i r s t article inspection (see 4.4).

b . Quality conformance inspection (see 4.5).

conditions.

Unless otherwise specified (see 6.2),

4 . 3 I n s p ec t i o n

all

i n s p e c t i o n s s h a l l be performed in accordance with the test conditions specified

4.7.1.

4 . 4 F i r s t a r t i c l e inspection

W h e n a first article inspection is required,

i t s h a l l b e a p p l i e d t o t h e f i r s t a r t i c l e s u b m i t t e d i n a c c o r d a n c e w i t h 3.1.

U n l e s s otherwise specified (see 6.2), f i r s t a r t i c l e i n s p e c t i o n s h a l l c o n s i s t o f

t h e e x a m i n a t i o n i n 4 . 6 a n d a l l t e s t s i n 4 . 7 . T h e machine shall pass the

examination and all tests to be accepted.

4 . 5 Q u a l i t y conformance inspection. Q u a l i t y conformance inspection shall be

a p p l i e d to each lathe prior to being offered for acceptance under the contract.

Unless otherwise specified (see 6.2),

q u a l i t y conformance inspection shall

c o n s i s t of the examination in 4.6 the tests in 4.7.1 through 4.7.4.4 and the

i n s p e c t i o n in 4.8. T h e machine shall pass the examination, all tests, and the

i n s p e c t i o n to be accepted.

4 . 6 Examination. Each lathe shall be examined to determine compliance with

a l l requirements of this specification.

4.7

Tests.

4 . 7 . 1 T e s t c o n d i t i o n s . All tests shall be performed in a n i n d o o r f a c i l i t y

w i t h ambient conditions of 41 to 104 Fahrenheit and 20 to 95 percent relative

humidity.

4 . 7 . 2 Operational

test

E a c h machine shall be operated at no load for not

less than 1 hour. P r o p e r operation o f a l l c o n t r o l s ,

motors, a d j u s t i n g

m e c h a n i s m s , and accessories shall be verified during the trial period.

4 . 7 . 3 A l i g n m e n t tolerance test

E a c h machine shall be tested to determine

compliance w i t h t h e a l i g n m e n t t o l e r a n c e requirements of 3.6. The alignment

t o l e r a n c e test shall be performed prior to and subsequent to the performance

tests given in 4.7.4.

Any machine a d j u s t m e n t s required to comply with 3.6

d u r i n g or after the performance test shall be cause for rejection.

4 . 7 . 4 Performance t e s t s

Each lathe shall be subjected to the following

c u t t i n g tests to determine whether the performance under cutting loads is within

the

requirements of this specification. All performance tests shall be

completed without making any adjustments to or performing any maintenance on the

machine.