MILLING MACHINE OPERATIONS - OD1644 - LESSON 1/TASK 1
5.
Milling Machine Operations
a.
General.
The milling machine is one of the most versatile
metalworking machines in a shop.
It is capable of performing simple
operations, such as milling a flat surface or drilling a hole, or more
complex operations, such as milling helical gear teeth.
It would be
impractical to attempt to discuss all of the operations that a milling
machine can do.
The success of any milling operation depends to a great
extent upon judgment in setting up the job, selecting the proper cutter, and
holding the cutter by the best means. Even though we will discuss only the
more common operations, the machinist will find that by using a combination
of operations, he will be able to produce a variety of work projects. Some
fundamental practices have been proved by experience to be necessary for
good results on all jobs. Some of these practices are mentioned below.
(1)
Before setting up a job, be sure that the workpiece, the table, the
taper in the spindle, and arbor or cutter shank, are all clean and free from
chips, nicks, or burrs.
(2)
Set up every job as close to the milling machine spindle as the
circumstances permit.
(3)
Do not select a milling cutter of larger diameter than is necessary.
(4)
Keep milling cutters sharp at all times.
(5)
Do not
change
feeds
or
speeds
while
the
milling
machine
is
in
operation.
(6)
Always lower the table before backing the workpiece under a revolving
milling cutter.
(7)
Feed the workpiece in a direction opposite to the rotation of the
milling cutter, except when milling long or deep slots or when cutting off
stock.
(8)
Never run a milling cutter backwards.
(9)
When using clamps to secure the workpieces, be sure that they are
tight and that the workpiece is held so that it will not spring or vibrate
while it is being cut.
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