Lathes Page: 49
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screws located on either side of the cricket. Setting the tailstock slide
toward the tool post results in a taper with the small diameter at the
tailstock end of the work, while setting the tailstock slide away from
the tool post puts the smaller diameter at the headstock end. In deter-
mining the proper offset for the tailstock slide it must be remembered
that the amount of set-over varies with the over-all length of the piece
being tapered. For example, the tailstock must be reset in order to cut
the same taper on pieces of different lengths. The amount of offset
is determined by the following formula:
FIGURE 46.-Taper turning by offsetting center.
Taper per inch
2 x length of work= set-over.
(3) The taper attachment (fig. 47) is an attachment for the machin-
ing of all types of tapers, both internal and external. Its length of
travel is considerably greater than that of the compound rest; however,
the angle to which it may be set is limited. When in use the taper at-
tachment is set to the angle desired by the graduated scale on the attach-
ment bracket, which reads either in inches per foot or degrees of taper.
A sliding guide block is set on the way of the taper attachment guide
bar, which in turn is fastened to the lathe cross slide by a link and
connecting screw. As the lathe carriage is moved, the guide block is
caused to move along the guide bar which is set at the required angle
to the axis of the lathe. This in turn causes the lathe cross slide to
move back and forth at right angles to the axis of the lathe, according
to the direction in which the carriage is traversed. The lathe cross slide
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United States. Army. Air Corps. Lathes, book, November 29, 1940; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96655/m1/51/: accessed April 27, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.