Lathes Page: 7
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f. Beyond proper rake and relief there are no definite rules to gov-
ern the shape of cutting tools. They may be square, pointed, of small
or large radii, or of irregular shape, and for certain classes of work
the cutting edge may be shaped to fit gages of various kinds (fig. 3).
SIDE RAKE ANGLE
SIDE RELIEF ANGL.E- SECTION
EDGE ANGLE TOOL
CUTTING G ....BIT
- '- 51DE RELIEF ANGLE ' .ANQLE
60 TO IO -
FIGURE 2.--Tool01 bit nomenclature.
Tools which are shaped to fit gages are generally known as "forming
tools" and can be used to advantage when making knobs, balls, machine
handles, radius grooves, etc.
FIGURE 3.-General tool bit forms.
g. The ordinary means of shaping cutting tools is by the use of
grinding wheels. The wet grinder is preferred and should be used with
a heavy flood of water so there is no danger of drawing the temper
from the tool as it is ground. If a dry wheel is used, the tool bit should
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/9/: accessed April 30, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.