cam is then clamped in this position.

A cutting-off tool is next placed in the rear toolpost at the proper
height. The rear toolpost slide is then adjusted to bring the point of
the cutting-off tool up to the work, and the cam drum is revolved by
hand until the piece is cut off. The cross-slide tool is, of course, set
in the proper position to make a collar of the required thickness.
Feeding by hand is discontinued when the roll is on the point of the
cam; the cutting-off tool slide is then permanently set on the
cross-slide so that the point of the cutting-off tool enters the bore
just far enough to completely sever the collar from the bushing. The
motion of the cam drum is continued, by hand, until the roll is over the
point of the feed cam. The cross-slide is then pushed back, by hand,
until the cam and roll are again in contact, when the return cam is
brought up and clamped in position, so that there is just room for the
roll between the feed cam and the return cam. The rear return cam (as
the hand feed of the cam drum is continued) brings the cross-slide back
to its central position. Since there is no front tool used for this
series of operations (although a tool is shown in the front toolpost,
Fig. 36), the first feed and return cams are allowed to remain wherever
they happen to be. These cam adjustments can all be made from the front
of the machine.

=Setting the Boring Tool for Recessing.=--The feeding of the turret
slide is now continued to make sure that the cutting-off tool is
returned to its normal position before the facing tool in the next face
of the turret begins to work. The facing of the bushing, so far as the
setting of the tool is concerned, is merely a repetition of the facing
operation at the first position of the turret. The recessing tool is
next set. This tool, which is shown diagrammatically in Fig. 39, is very
simple as compared with the somewhat complex operation it has to
perform. This recess is for clearance only, and accurate dimensions and
fine finish are not necessary. The recessing tool consists simply of a
slender boring-bar held in the turret and carrying a cutter suitably
located about midway the bar. The forward end of the bar is small enough
to enter a bell-mouthed bushing held in the chuck. The boring-bar is
bent to one side far enough so that the cutter clears the hole as the
bar enters, but is forced into the work as the rounded hole of the
bushing engages the end of the bar a