Lathes Page: 26
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16 AIR CORPS
repeated until the desired accuracy is attained. Before cutting, all
chuck jaws must be tight.
(3) When centering smooth-surfaced work to a high degree of
accuracy, a test indicator may be used. To do this the indicator is
placed on the lathe with the indicator point in contact with the
surface to be alined (fig. 16). The chuck is then rotated by hand.
and the concentricity is shown by the indicator pointer movement.
Adjustment may be made on the jaws until the desired accuracy is
(4) To remove chucks or face plates that are screwed on the lathe
spindle, a chuck-removing wrench should be used, although if not
available a block of wood placed between the ways of the lathe and
one chuck jaw is satisfactory if the lathe spindle is placed in reverse
and started in low gear (fig. 20). Caution: A wood plate should
always be placed on the lathe bed below the chuck during this opera-
tion to protect both chuck and lathe from damage.
b. The universal chuck is used in holding round and hexagonal
work and can be adjusted to centralize the work quickly. Two sets
of jaws are usually required on a universal chuck; one set for in-
ternal work and one set for external work (fig. 21).
By means of ta chck wrench.
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/28/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.