Lathes Page: 5
94 p: ill, .17 cm. Enclosed at end: Change 1 (3 pages) Contents: I. Nomenclature and maintenance -- II. Cutting tools, speeds, and lubricants -- III. Application of measuring instruments -- IV. Holding work -- V. General lathe operations -- VI. Drilling, reaming, and boring -- VII. Threads and threading -- VIII. Types of fits -- IX. Gear blank calculationsView a full description of this book.
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TM 1-420
LATHES 4-6
m. Do not use power to apply any chuck or driving plate.
n. Do not leave a machine when it is running. Maintain a posi-
tion enabling instant control of the operating levers.
o. Do not leave a machine in a dirty condition. Upon completion
of a job or at the end of a day, clean the machine and see that the
tools are in good shape and in their proper places. Keep the machine
in working order and, if anything is wrong, report it to the proper
person.
p. Do not form the habit of carrying on idle conversation with a
fellow workman. If conversation is necessary, shut off the machine.
q. Keep the hands away from revolving work.
r. Do not work in loose clothing and keep sleeves rolled up to the
elbows.
s. Do not allow boxes, pieces of stock, or other objects that might
be tripped over to lie on the floor around the lathe.
t. Do not handle chips or shavings with the bare hands; they may
be hot or have razor-sharp edges.
u. Do not attempt to lift heavy articles alone. Get a helper or use
a crane.
v. Do not leave the chuck wrench in the chuck.
w. Do not fail to report an injury and have it treated immediately.
x. Keep dirty and oily rags or waste in metal containers until dis-
posed of. If they are left in a pile exposed to the atmosphere, a fire
may be started due to spontaneous combustion.
SECTION II
CUTTING TOOLS, SPEEDS, AND LUBRICANTS
Paragraph
General------------------------- 5-------------------------------------5
Cutting tools ------------ -------------------- - ----------------------- 6
Tool holders 7-----------------------------------------------------------
Cutting speeds and feeds ---- 8
Cutting lubricants ------------------9-------------
5. General.-In order to machine materials efficiently it is neces-
sary to have the correct type of tool, with a keen cutting edge, well
supported, and set at the proper height.
6. Cutting tools.-a. Primarily, cutting tools may be considered
as wedges which are forced into the material to cause compression
with a resultant rupture or plastic flow of the material. This rup-
ture or plastic flow is usually called cutting. If the wedge is of thin
section, it will cut more easily, but will not have the strength to
resist the load applied when machining steel or other hard and
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (https://digital.library.unt.edu/ark:/67531/metadc96655/m1/7/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.