Figure 7-78.--Universal milling (head) attachment.
diameter of the arc through which the tool moves is
results in a more rigid boring operation, but the size of
also a factor. For all of these reasons you must avoid
the hole that can be bored is more limited than those
too-great of speeds to prevent vibration.
on a lathe or a drill press.
Fly cutters, which we discussed previously, can
MILLING MACHINE ATTACHMENTS
cutter is especially useful to bore relatively shallow
Many attachments have been developed that
hales. The cutting tool must be adjusted for each
increase the number of jobs a milling machine can do,
depth of cut.
or that make such jobs easier to do.
The speeds and feeds you should use to bore on a
UNIVERSAL MILLING ATTACHMENT
milling machine are comparable to those you would
use to bore on a lathe or drill press. They also depend
The universal milling (head) attachment, shown
on the same factors: hardness of the metal, kind of
metal in the cutting tool, and depth of cut. The boring
machine. The cutter can be secured in the spindle of
bar is a single-point cutting tool; therefore, the