ont after the
collar-screw _m_ is loosened. The cutter _c_ is removed by taking off
the adjusting-screw plate _s_ after loosening the collar-screw _n_. The
cutter _d_ is held in a dove-tailed slot by two headless set-screws _q_.
It is also backed up by an adjusting screw in the plate _s_. These
adjusting screws should all have fine threads, say from 32 to 40 per
inch, and be nicely fitted so they will not loosen after being adjusted.

The box-tools shown at _B_ and _C_, Fig. 10, are for turning the sides
of a loose pulley for a sewing machine. This pulley (shown by the dotted
lines) is finished in two operations. The box-tool for finishing the
side of the pulley on which the hub projects beyond the rim, is shown at
_B_. The inverted cutter _a_, which faces the end of the hub, is held by
a clamp _c_ (clearly shown in the end view) from the under side and it
has no adjustment. The collar-screw _d_ is tapped into this clamp, which
is prevented from getting out of place by the dowel-pin _f_. The pilot
_g_ is made small in the shank, so that tool _a_ can be so placed as to
insure the removal of all burrs around the bore of the hub. The pilot is
held by a set-screw and it is provided with oil grooves. The cutter _j_
sizes the outside of the hub, and the cutter _k_ faces the side of the
pulley rim. These cutters are both held by the clamp _l_ and the
collar-screw _m_. No side plates are used on this tool, and the cutters
are all easily removed.

[Illustration: Fig. 10. Examples of Box-tool Designs]

Sketch _C_ shows the box-tool used for the second operation. As the hub
is flush with the rim on the side for which this tool is intended, it
needs only one cutter to face both. This is done by the wide cutter _a_
which is held in a dove-tailed slot in the front of the tool and is
fastened by the clamp _b_ and collar-screw _c_. The bushing _d_, in
which the end of the work arbor is supported, is held by the
collar-screw _e_, and to obtain the necessary compression, the body of
the tool is slotted as far back as _f_. This bushing is provided with
oil grooves and one side is cut away to clear the cutter _a_. The
pilot end of the arbor on which the work is mounted is 1/16 inch smaller
than the bore of the pulley, which allows the cutter to be set in far
enough to prevent any burr which might form at the edge of the bore. A
disk _i_ is inserted back of bushing _d_, so that the latter may be
easily removed by passing a rod through the