After the hole is bored and reamed, the work may be finished at the end
by using a tool ground like a threading tool, but having an angle at
the point a little less than 90 degrees, as in Fig. 29.
[Illustration: Fig. 29]
The boss, or hub, which is 1⅜ inches in diameter, is finished with one
cutting edge of this tool set nearly parallel to the work, the point
being a trifle deeper than the rest. This will insure the full depth of
cut for the entire length and also a good sharp corner. The direction
of feed for this tool should be from the end and towards the square
corner or shoulder. If it is fed in the opposite direction the tool is
apt to chatter.
This tool is also used to finish the end, but it is turned a little
in the tool post so that the other cutting edge is nearly parallel to
the surface to be cut. After using this tool, the work may be finished
smoother by scraping the ends, as in Fig. 25, and by filing the boss,
or hub.