MIL-L-23400E
Each lathe shall be tested to deter-
4.7.1.1 Alignment tolerance test.
mine that it complies with the alignment tolerance requirements of paragraph
Following completion of the tests described in paragraphs 4.7.1
3.6.
through 4.7.2.3 the alignment tolerance test shall be repeated to determine
that the lathe remains in compliance with the requirements of paragraph 3.9
without requiring adjustments.
Each lathe shall be subjected to the following
4.7.2 Performance test.
cutting tests to determine whether the performance under cutting loads is
within the requirements of this specification. When specified (see 6.2.1),
tests of specific requirements shall be performed in addition to or in lieu
of the following tests.
A test bar of SAE 1040 steel, or steel of
Round turning test.
4.7.2.1
..
equal machinability, shall be held in a chuck and turned for a length of
approximately two inches at the RPM and feed rate based on the recommended
The finish cut shall
surface cutting speed for the material and tool used.
be conducted in accordance with test number 21 of ANSI B5.16 and shall meet
the tolerances as stated in table II of this specification under the proper
category for the type lathe specified.
4.7.2.2 Cylindrical turning test. A test bar of SAE 1040 steel, or steel
of equal machinability, shall be rough turned to the configuration of the
specimen in ANSI B5.16 for cylindrical turning. A finish cut using carbide
tooling shall be made over the two collars in one pass without adjustment
between collars. The turned collars shall be within the accuracy tolerance
specified in test number 22 of table II under the proper category for the
The test part shall then be prepared for turning
type lathe ordered.
A cut shall
between centers as described in test number 23 of ANSI B5.16.
be made 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 material and carbide tooling.
4.7.2.3 Roughing test, A square specimen of 1040 steel or steel of equal
machinability with 3-inch sides, and 16 inches in length shall be rough-
turned between 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
The maximum diameter of the bar at the tailstock and the maximum
inches .
diameter of the bar measured 10 and 15 inches from the tailstock end of the
bar, shall not vary by more than plus or minus 0.001 inch, The kickback of
the carriage relative to the bed shall be measured and shall not exceed
0.001 inch during any single cut.
The deflection of the tailstock spindle
shall not exceed 0.002 inch, measured l/8-inch from the nose of the spindle
during the roughing test.
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