shaft with a crank, the position of the turret-slide, with
relation to the cam, may be adjusted for long or short work and long or
short tools, as may be required.

[Illustration: Fig. 33. Rear View of Machine showing the Cross-slide
Mechanism, Driving Gearing, etc.]

The cams which operate the cross-slide are mounted on the right-hand end
of drum _E_ and actuate the yoke _A_ (see Fig. 33) which extends
diagonally upward. The rear end of this yoke has rack teeth meshing with
the teeth of a segmental pinion, which is fastened to rock-shaft _B_.
At the headstock end, this rock-shaft carries another segmental pinion
meshing with rack teeth formed on the cross-slide. The movement imparted
to the yoke by the cams is thus transmitted through the pinions and
rock-shaft to the cross-slide.

[Illustration: Fig. 34. The Automatic Controlling Mechanism for Feeds
and Speeds]

The cam drum _E_ is driven by a pinion meshing with a gear attached to
its front side. This pinion is driven through a train of gearing from
pulley _L_ (see Fig. 34) which is belted to the spindle. The feeds are
thus always dependent on the spindle speed. By means of epicyclic
gearing and suitable clutches, the motion thus derived from the spindle
may be made rapid for returning the turret to be indexed and then
advancing it to the cutting position again, or very slow for the forward
feed when the tools are at work. These changes from slow to fast or
_vice versa_ are controlled by disk _D_. This disk carries pins which
strike a star wheel located back of the disk at the top, and as this
star wheel is turned, the speeds are changed by operation of the gearing
and clutches referred to. The first pin _M_ that strikes the star wheel
advances it one-sixth of a rotation, changing the feed from fast to
slow; the next pin that strikes it advances it another sixth of a
rotation, changing the feed from slow to fast and so on. By adjusting
the pins for each piece of work, the feed changes are made to take place
at the proper time. Handwheel _E_ is geared with the cam-shaft on which
the star wheel is mounted, so that the feeds may be changed by hand if
desired.

In addition to these feed-changing pins, disk _D_ has a dog which
operates a lever by which the feed movement is stopped when the work has
been completed. Four rates of feed are provided by quick change gearing
of the sliding gear type, operated by handle _K_. With this handle set
in the central position, th