Lathes Page: 55
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used, following the emery cloth or sandpaper, to give a finish of
g. The center adjustment and lubrication should be watched closely
while polishing, as the high speed and friction of the cloth will cause
rapid expansion of the work with resultant loss of center lubrication.
34. Radius turning and boring. a. The forming of curves,
radii, and other irregular shapes, both internal and external, is gen-
erally accomplished either by free hand guiding of the cutting tool
or by the use of specially ground forming tools.
(1) A considerable amount of manual dexterity is required for
free hand guiding of a tool to form an outline that will be smooth
of surface and sufficiently near the proper shape and dimensions.
The sizing of such shapes may be greatly assisted by the repeated
use of calipers at various dimensional points. Templates may also
be used to advantage in the production of irregular outlines when
applied in the following manner:
(a) Scribe outline of work on a piece of tin.
(b) Clamp this tin template to ways of lathe and attach an im-
provised movable pointer to lathe saddle.
(c) Set tool bit at place desired on work and bend pointer to
corresponding place on template.
(d) With the work revolving at the proper speed, manually oper-
ate both cross and longitudinal feeds so as to keep pointer following
lay-out reproducing its shape on the work.
(e) File and polish to improve finish and remove any small irreg-
ularities that may be present.
(2) Specially ground form tools are particularly adaptable for
accurately producing small, irregular shapes, although some difficulty
will probably be encountered with their use since the bearing surface
of such a tool is rather broad. More pressure and machine power is
needed to make it cut than is necessary for the ordinary cutting tool,
and there is a considerable tendency for it to tear the work.
b. The foregoing methods must not be considered accurate. When
accuracy of shape is necessary the tool travel should be controlled by
some type of mechanical generating agent. For the forming of small
radii and curves of simple nature, these may be composed of swivel-
type tool holders. For larger radii, link mechanisms may be at-
tached to the machine to give the desired results.
35. Spring winding on lathe.-Springs may be easily and
quickly wound in the lathe, on mandrels of appropriate size, using
annealed spring wire. When the spring winding mandrel diameter
is larger than 3/ inch, the mandrel is mounted in the lathe chuck.
Mandrels less than 3 inch in diameter are mounted ill a drill chuck,
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/57/: accessed February 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.