The rear return cam (as the hand feed of the cam drum is continued) brings the cross-slide back to its central position.
As the grinding proceeds, the wheel is fed inward slightly by manipulating 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.
The cross-slide has bolted to it a bar A carrying a roller which is pressed against a forming plate B by a heavy spring C.
The machine illustrated has a power feed for the cross-slide as well as for the turret.
The small handle at O is for moving the cross-slide along the bed when this is necessary in order to feed a tool sidewise.
The unfinished part is then turned, and if the cross-slide is not moved, the tool will meet the first cut.
The work also is shown threaded for its entire length; this cannot be accomplished with any one location of the cross-slide.
The rear bevel is roughed and finished by tools and held on the cross-slide.
At the headstock end, this rock-shaft carries another segmental pinion meshing with rack teeth formed on the cross-slide.