Lathes Page: 51
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(2) By laying off equally spaced scriber lines around the tapered
portion of the work and using a micrometer to determine differences
in diameters between the marks.
30. Taper boring.-a. In general, the rules that are applicable
to outside taper turning also apply to the boring of tapered holes.
The cutting point of the tool is placed on center and, if the taper
attachment is used, care must be exercised to eliminate the backlash
of the slide fittings so that the hole will not be bored straight at the
COARSE- KNURL MEDIUM KNUL FI NE KNU..
FIGURE 48.-Knurl rolls and patterns.
start. The measurement of the size and taper of the hole is gen-
erally made.with a taper plug gage by the cut and try method.
After a cut or two has been taken, the bore is cleaned, the gage
rubbed lightly with chalk, inserted in the hole, and twisted slightly
to cause the chalk to show where the gage is bearing. Any necessary
corrections may then be made and the boring continued until the
taper is brought to size. A very light application of prussian blue
to the gage will give better results than chalk for more accurate
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/53/: accessed January 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.