Tc 9-524 fundamentals of machine tools

8-9

---

TC 9-524
The slitting saw milling cutter arbor (Figure 8-14) is a short
arbor having two flanges between which the milling cutter is
secured by tightening a clamping nut. This arbor is used to
hold metal slitting saw milling cutters used for slotting,
slitting, and sawing operations.
The shell end milling cutter arbor has a bore in the end in
which shell end milling cutters fit and are locked in place by
means of a cap screw.
The fly cutter arbor is used to support a single-edge lathe,
shaper, or planer cutter bit for boring and gear cutting
operations on the milling machine.
COLLETS, SPINDLE ADAPTERS, AND
QUICK-CHANGE TOOLING
Description
Screw arbors are used to hold small cutters that have
Milling cutters that contain their own straight or tapered
threaded holes. These arbors have a taper next to the
threaded portion to provide alignment and support for tools
shanks are mounted to the milling machine spindle with
that require a nut to hold them against a taper surface. A
collets, spindle adapters, and quick-change tooling which
adapts the cutter shank to the spindle.
right-hand threaded arbor must be used for right-hand cutters
while a left-hand threaded arbor is used to mount left-hand
cutters.
8-10

---

TC 9-524
Collets
A collet is a form of a sleeve bushing for reducing the size
of the hole in the milling machine spindle so that small shank
tools can be fitted into large spindle recesses (Figure 8-15).
They are made in several forms, similar to drilling machine
sockets and sleeves, except that their tapers are not alike.
Spindle Adapters
A spindle adapter is a form of a collet having a standardized
spindle end. They are available in a wide variety of sizes to
accept cutters that cannot be mounted on arbors. They are
made with either the Morse taper shank or the Brown and
Sharpe taper with tang having a standard spindle end (Figure
8-16).
Chuck Adapter
A chuck adapter (Figure 8-17) is used to attach chucks to
milling machines having a standard spindle end. The collet
holder is sometimes referred to as a collet chuck. Various
forms of chucks can be fitted to milling machines spindles for
holding drills, reamers, and small cutters for special
operations.