Tc 9-524 fundamentals of machine tools

HIGH-SPEED MILLING ATTACHMENT
The rate of spindle speed of the milling machine may be
increased from 1 1/2 to 6 times by using the high-speed
milling attachment. This attachment is essential when using
cutters and twist drills which must be driven at a high rate of
speed in order to obtain an efficient surface speed. The
attachment is clamped to the column of the machine and is
driven by a set of gears from the milling machine spindle.
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TC 9-524
VERTICAL SPINDLE ATTACHMENT
This attachment converts the horizontal spindle of a
horizontal milling machine to a vertical spindle. It is clamped
to the column and driven from the horizontal spindle. It
incorporates provisions for setting the head at any angle, from
the vertical to the horizontal, in a plane at right angles to the
machine spindle. End milling and face milling are more easily
accomplished with this attachment, because the cutter and the
surface being cut are in plain view.
UNIVERSAL MILLING ATTACHMENT
This device is similar to the vertical spindle attachment but
is more versatile. The butterhead can be swiveled to any angle
in any plane, whereas the vertical spindle attachment only
rotates in one place from horizontal to vertical.
ROTARY TABLE OR CIRCULAR MILLING
ATTACHMENT
This attachment consists of a circular worktable containing
T-slots for mounting workplaces. 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, angular indexing, arcs, segments,
circular slots, grooves, and radii, as well as for slotting
internal and external gears. The table of the attachment is
divided in degrees (Figure 8-20).
advances twice the amount shown on the micrometer dial.