To finish the taper, set the compound rest at an angle of 30 degrees
with the axis of the lathe. Such a rest is normally at right angles
with the lathe axis so that it must be turned through 60 degrees to cut
the 30 degree angle. A regular turning tool may be used to finish this
angle, but it should be set so that the straight side will be nearly
parallel with the tapered surface.
If the lathe is not provided with a compound rest, the angle may be cut
with the side of a tool set at the proper angle. To set this tool, use
the thread and center gauge, as shown in Fig. 26.
In case the angle is any other than 30, or 60 degrees, it is necessary
to set the tool with a bevel and bevel protractor.
After the taper has been cut, it may be finished smooth by scraping
with a lathe scraper in very much the same manner as shown in Fig. 25.
The tool that is used as a rest is set in as close as possible to the
taper. If this rest is too far away from the surface being finished,
the scraper will chatter leaving a rough surface.
[Illustration: Piece B.