MILLING MACHINE OPERATIONS - OD1644 - LESSON 1/TASK 1
discussed in this text. Keep in
mind that although we are discussing a knee
and a column milling machine,
this information can be applied to other
types. Use figure 1 on page 3
(which illustrates a plain knee and column
milling machine) to help become
familiar with the location of the various
parts of these machines.
(1)
Column.
The column, including the base, is the main casting which
supports all other parts of the machine. An oil reservoir and a pump in the
column keeps the spindle lubricated.
The column rests on a base that
contains a coolant reservoir and a pump that can be used when performing any
machining operation that requires a coolant.
(2)
Knee.
The knee is the casting that supports the table and the
saddle.
The feed change gearing is enclosed within the knee.
It is
supported and can be adjusted by the elevating screw. The knee is fastened
to the column by dovetail ways. The lever can be raised or lowered either
by hand or power feed. The hand feed is usually used to take the depth of
cut or to position the work, and the power feed to move the work during the
machining operation.
(3)
Saddle and Swivel Table. The saddle slides on a horizontal dovetail,
parallel to the axis of the spindle, on the knee.
The swivel table (on
universal machines only) is attached to the saddle and can be swiveled
approximately 45 in either direction.
(4)
Power Feed Mechanism. The power feed mechanism is contained in the
knee and controls the longitudinal, transverse (in and out) and vertical
feeds.
The desired rate of feed can be obtained on the machine by
positioning the feed selection levers as indicated on the feed selection
plates.
On some universal knee and column milling machines the feed is
obtained by turning the speed selection handle until the desired rate of
feed is indicated on the feed dial.
Most milling machines have a rapid
traverse lever that can be engaged when a temporary increase in speed of the
longitudinal, transverse, or vertical feeds is required. For example, this
lever would be engaged when positioning or aligning the work.
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