equipped with two cutters and rough faces the flange and
end, while the inner and outer surfaces of the cylindrical part are
rough bored and turned by combination boring and turning tool No. 2.
This tool has, in addition to a regular boring-bar, a bracket or
tool-holder which projects above the work and carries cutters that
operate on the top surface. Tools Nos. 3 and 4 next come into action,
No. 3 finishing the surfaces roughed out by No. 2, and No. 4
finish-facing the flange and end of the hub. The detailed side view of
Tool No. 3 (which is practically the same as No. 2), shows the
arrangement of the cutters _C_ and _D_, one of which turns the
cylindrical surface and the other bevels the end of the hub. The hole in
the hub is next finished by tool No. 5 which is a stepped reamer that
machines the bore and counterbore to the required size within very
close limits. The surfaces machined by the different tools referred to
are indicated by the sectional view _E_ of the hub, which shows by the
numbers what tools are used on each surface.

For the second series of operations, the position of the hub is reversed
and it is held in a spring or collet type of chuck as shown by the plan
view Fig. 3. The finished cylindrical end of the hub is inserted in the
split collet _F_ which is drawn back into the tapering collet ring by
rod _G_ (operated by turnstile _H_, Fig. 1) thus closing the collet
tightly around the casting. The first operation is that of facing the
side of the flange and end of the hub with tool No. 6 on the
cross-slide, which is shown in the working position. A broad cutter _H_
is used for facing the flange and finishing the large fillet, and the
end is faced by a smaller cutter _I_. When these tools are withdrawn,
tool No. 7 is moved up for rough turning the outside of the cylindrical
end (preparatory to cutting a thread) and rough boring the hole. These
same surfaces are then finished by tool No. 8. The arrangement of tools
Nos. 7 and 8 is shown by the detailed view. Tool _J_ turns the part to
be threaded; tool _K_ turns the end beyond the threaded part; and tool
_L_ bevels the corner or edge. The reaming tool No. 9 is next indexed to
the working position for finishing the hole and beveling the outer edge
slightly. At the same time, the form tool No. 10, held at the rear of
the cross-slide, is fed up for beveling the flange to an angle of 60
degrees. The final operation is that of threading the end, which is done