Lathes Page: 4
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3-4 AIR CORPS
screws and the leveling rechecked after the screws have been drawn
c. The proper adjustment of the various clutches, bearings, and mat-
ing members of the lathe are most important in the production of
accurate work. Some of the common adjustments are listed here in
the order of the frequency that they will probably occur:
(1) Gibs on cross feed, compound, and carriage.
(2) Longitude and cross feed clutches.
(3) Thrust bearing on lathe spindle.
(4) Headstock motor drive clutch.
(5) Spindle bearings.
(6) Thrust collar on lathe lead screw.
d. Keeping the lathe well oiled will greatly influence its operating
efficiency as well as its life. Only a good grade of machine oil, equal
in quality to SAE No. 10, should be used and all bearings and bear-
ing surfaces oiled regularly. The bearings should always be oiled
progressively so that none will be omitted. When oiling the sliding
surfaces, such as the ways, cross slide, etc., it is best to rub the oil in
with the hands so as to make sure that the oil is well distributed.
It is not necessary to use an excess of oil, a few drops being sufficient.
4. Safety measures.-The following safety measures will help
to keep the lathe in working order and prevent injury to the operator:
a. Do not operate a machine before it has been thoroughly oiled.
b. Unless familiar with the machine, do not attempt to operate it
before receiving instructions.
c. Try out all operating levers and cranks and place them in safe
or neutral positions before starting the motor.
d. If a crank or operating lever does not work with ease, do not
force it. Find out what is wrong.
e. Do not oil the machine while it is running.
f. Do not leave safety guards off gears, belting, etc.
g. Do not hammer on the lathe.
h. Do not lay hard or heavy objects, such as files, chucks, etc., on
i. Do not let dirt, shavings, oil, or refuse accumulate about the
j. Do not work without proper light.
k. Do not "slam" the clutch lever in and out of engagement; ease it
in and out.
1. When screwing chucks on and off the spindle, support them in
such a manner that they will not drop onto the ways and cause
damage to the machine.
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/6/: accessed March 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.