Lathes Page: 42
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25 AIR CORPS
a. Carefully clean spindle taper, center, and center sleeve. Inspect
these mating parts carefully and see that they are free from burs and
b. Insert center and sleeve solidly in lathe spindle.
c. Set compound rest at angle of 300 to the ways of the lathe.
d. Lubricate dovetail slide of compound.
e. Adjust tapered gib at side of compound to remove all possible
lost motion without causing it to bind.
f. Mount a tool post grinder in tool post and adjust face of grinding
wheel parallel to conical surface'of center. See that point of center
is alined with center hole in end of arbor of grinder. Check grinder
for end play and adjust if necessary.
g. Cover carriage and ways with paper or cloth to protect them
from particles of abrasive grit from grinding wheel as this grit will
become imbedded in the metal and rapidly destroy accuracy of lathe.
FIGURE 39.-Testing 60 angle with center gage.
h. Set compound rest near center of its travel and move carriage
and cross feed up until grinding wheel is within a few thousandths
of an inch of the center. Lock carriage in this position to prevent
movement during grinding operation.
i. Start lathe at a moderate speed (100 to 150 r. p. m.) and then
start grinder, making sure that lathe and grinding wheel turn in the
same direction of rotation.
j. Move grinding wheel by means of cross feed until it just touches
revolving center. Set depth of cut between 0.001 inch and 0.002
inch and carefully feed grinding wheel along face of center by hand
feed, starting at small end of center and feeding toward headstock.
Repeat operation until center is clean and smooth.
k. Using a 60 center gage (fig. 39), check angle of center. If it
is not true, readjust compound accordingly and repeat above opera-
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/44/: accessed June 27, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.