Machinery Repairman

Figure 7-4.—Small vertical milling machine.
This machine is used to cut most types of gears,
milling cutters, and twist drills and is used for various
kinds of straight and taper work.
The PLAIN MILLING MACHINE (fig. 7-2) is
the simplest milling machine because it has only a few
of the features found on the other machines. You can
move the table in three directions: longitudinally (at a
right angle to the spindle), transversely (parallel to the
spindle), and vertically (up and down). This
machine’s major advantage is its ability to take heavy
cuts at fast speeds. The machine’s rigid construction
makes this possible.
The VERTICAL SPINDLE MILLING
MACHINE (fig. 7-3) has the spindle in a vertical
position and at a right angle to the surface of the table.
The spindle has a vertical movement, and the table
can be moved vertically, longitudinally, and
transversely. You can control movement of both the
spindle and the table manually or by power. You can
use this machine for face milling, profiling, and die
sinking and for various odd-shaped jobs. You also
can use it used to advantage to bore holes. Various
small vertical spindle milling machines (fig. 7-4) are
also available for light, precision milling operations.
7-3
Figure 7-5.—Plain milling machine, showing operation
controls.
MAJOR COMPONENTS
You must know the name and purpose of each of
the main parts of a milling machine to understand the
operations discussed later in this chapter. Keep in
mind that although we are discussing a knee and
column milling machine you can apply most of the
information to the other types.
Figure 7-5 shows a plain knee and column milling
machine, and figure 7-6 shows a universal knee and
column milling machine. Look at these figures to
help you identify the components described in the
following paragraphs.
COLUMN: The column, including the base, is
the main casting that supports all other parts of the
machine. An oil reservoir and a pump in the column
keep the spindle lubricated. The column rests on a
base that contains a coolant reservoir and a pump that
you can use when you perform any machining
operation that requires a coolant.