MILLING MACHINE OPERATIONS - OD1644 - LESSON 1/TASK 1
operations are more easily accomplished with this attachment, due to the
fact that the cutter and the surface being cut are in plain view.
f.
Universal Milling Attachment. This device is similar to the vertical
spindle attachment but is more versatile. The cutter head can be swiveled
to any angle in any plane, whereas the vertical spindle attachment only
rotates in one plane from the horizontal to the vertical.
g.
Circular Milling Attachment.
This attachment consists of a circular
worktable containing T-slots for mounting workpieces.
The circular table
revolves on a base attached to the milling machine worktable.
The
attachment can be either hand or power driven, being connected to the table
drive shaft if power driven.
It may be used for milling circles, arcs,
segments, and circular slots, as well as for slotting internal and external
gears. The table of the attachment is divided in degrees.
h.
Offset Boring Head. The offset boring head is an attachment that fits
to the milling machine spindle and permits a single-edge cutting tool, such
as a lathe cutter bit, to be mounted off-center on the milling machine.
Workpieces can be mounted in a vise attached to the worktable and can be
bored with this attachment.
4.
Mounting and Indexing Work
a.
General.
(1)
An efficient and positive method of holding workpieces to the milling
machine table is essential if the machine tool is to be used to advantage.
Regardless of the method used in holding, there are certain factors that
should be observed in every case.
The workpiece must not be sprung in
clamping; it must be secured to prevent it from springing or moving away
from the cutter; and it must be so aligned that it may be correctly
machined.
(2)
Milling machine worktables are provided with several T-slots, used
either for clamping and locating the workpiece itself or for mounting
various holding devices and attachments. These T-slots extend the length of
the table and are parallel to its line of travel.
Most milling machine
attachments, such as vises and index
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