ition in the illustration. Cutters
_f_{1}_, _g_{1}_ and _h_{1}_ correspond with the cutters _f_, _g_ and
_h_, previously referred to, and perform the same operations.

The remaining operation of finishing the back of the hub is effected by
cutter _p_. This cutter is removed from the bar, which is then inserted
through the bore; the cutter is then replaced in its slot and the rear
end of the hub is faced by feeding the carriage away from the headstock.
This completes the operations, the flywheel being finished at one
setting.

=Finishing a Webbed Flywheel in Two Settings.=--The plan views _B_ and
_C_, Fig. 7, show the arrangement of tools for finishing a webbed
flywheel which has to be machined all over. This, of course, requires
two operations. In the first of these (see sketch _B_) the rough casting
is chucked on the inside of the rim with regular inside hard chuck jaws
_b_. The cored hole is first rough bored with cutter _n_ attached to the
end of boring-bar _m_, and guided by the drill support _d_ pivoted to
the carriage. Next, the boring-bar _m_{1}_ is brought into position, the
drill support being swung back out of the way. This bar is steadied by
its bearing in bushing _r_ in the chuck. Two cutters, _n_{1}_ and
_n_{2}_, are used to roughly shape the hole to the desired taper, the
small end being finished to within 0.002 inch of the required diameter.
While boring with the bar _m_{1}_, the scale is broken on the web and
hub of the casting by the tool _k_ in the turret toolpost. The latter is
then shifted to bring the tool _j_ into position for removing the scale
on the periphery of the wheel. Next, the hole is reamed with taper
reamer _q_, the pilot of which is supported by bushing _r_.

The first of the facing heads is now brought into action. This facing
head carries a guide _t_ which is steadied in a taper bushing _c_,
driven into the taper hole of the hub for that purpose. The top cutter
_f_ turns the periphery, cutter _g_ turns the hub and faces the web,
and cutter _h_ faces the rim. A fourth cutter _e_ on the under side of
the head faces the hub. This casting is now machined approximately to
size.

For finishing, similar cutters, _e_{1}_, _f_{1}_, _g_{1}_ and _h_{1}_,
in the other facing head are used, the latter being supported by the
taper bushing _c_ in the same way. A very light cut is taken for
finishing. Tool _l_ in the carriage turret is used to round the outer
and inner corners of the rim, which c