Figure 6-13.--Castle-type toolpost and toolholder.
special fixtures that may be secured to the lathe to
The compound rest swivel (2), which can be
extend the versatility of the lathe to include
swung around to any desired angle and
taper-cutting, milling, and grinding. Some of the
clamped in position. It is graduated over an arc
common accessories and attachments used on lathes
of 90° on each side of its center position for
are described in the following paragraphs.
ease in setting to the angle you select. This
feature is used in machining short, steep tapers
such as the angle on bevel gears, valve disks,
and lathe centers.
Three popular types--standard, castle, and quick
The compound rest top, or topslide (3), is
change--are discussed in the following paragraphs.
mounted as shown on the swivel section (2) on
The sole purpose of the toolpost is to provide a rigid
a dovetailed slide. It is moved along the slide
support for the toolholder.
by the compound rest feed screw turning in the
nut (4), operated by the handle (5), in a manner
The standard toolpost is mounted in the T-slot of
similar to the cross feed described previously
toolholder (13) is inserted in the slot in the toolpost
angle (determined by the angular setting of the
and rests on the toolpost wedge (11) and the toolpost
swivel section), while the cross-slide feed
ring (12). By tightening the setscrew (10), you clamp
provides only for feeding at a right angle to the
the whole unit firmly in place with the tool in the
axis of the lathe. The graduated collar on the
compound rest feed screw reads in thousandths
of an inch for fine adjustment in regulating the
depth of cut.
boring bar-type toolholders. It mounts in the T-slot
and the toolholder (boring bar) passes through it and
the holddown bolt. By tightening the locking nut, you
ATTACHMENTS AND ACCESSORIES
clamp the entire unit firmly in place. Various size
Accessories are the tools and equipment used in
holes through the toolpost allow the use of assorted
routine lathe machining operations. Attachments are
diameter boring bars.